The short version: gas boilers are out. Heat pumps are in. Solar panels go on the roof. Insulation gets significantly better. And the home you build will need to produce at least 75% less carbon than a home built to 2013 standards.

This is not a vague ambition. It is now law, with the detailed technical requirements set out in updated Approved Documents and coming fully into force on 24 March 2027. If you are building now or planning to start in the next 12 to 18 months, this affects your design, your specification, and your budget. This guide explains what has actually changed, what it means in practice, and what the transitional rules mean for your specific timeline. If you want to understand how these changes sit within the broader regulatory picture, our guide to building regulations for new builds in London covers the full framework.

What Is the Future Homes Standard?

The Future Homes Standard is a major overhaul of Part L of the Building Regulations, the section that governs energy efficiency and carbon emissions from new buildings. It was formally published on 24 March 2026 and comes into force on 24 March 2027. The full name is the Future Homes and Buildings Standard, and it covers both residential and non-domestic buildings, though this guide focuses on new homes. The official government documentation is available on gov.uk.

The headline requirement is a 75% reduction in carbon emissions compared to homes built to 2013 standards. That target is so demanding that no fossil fuel heating system can meet it. Gas boilers, oil boilers, and LPG systems are all effectively ruled out for new builds from the point full compliance kicks in.

The standard has been in the pipeline for years. There was an interim Part L update in 2021 that pushed homes to roughly 30% better than 2013 standards as a stepping stone. The 2026 update goes much further, and the industry has known it was coming. The main question for anyone building now is whether their project falls within the transitional arrangements or whether they need to comply in full from day one.

The Key Dates: What Applies When

The timeline is important and slightly confusing, so here it is set out clearly.

The transitional rules apply to individual buildings, not to entire sites. Submitting an application for one plot on a development before 24 March 2027 does not protect other plots on the same site that are applied for later. Each building is assessed individually.

If you are planning to submit a building regulations application in early 2027, check the date carefully. An application submitted on 25 March 2027 must comply with the FHS. One submitted on 23 March 2027 can use the older standard, provided construction starts before 24 March 2028.

What Actually Changes Under the Future Homes Standard?

The FHS changes four things: how you heat the home, how you generate energy on site, how well the building fabric performs, and how ventilation is handled. Here is what each of those means in practice.

1. Heating: heat pumps replace gas boilers

This is the biggest change for most homeowners. Gas boilers cannot meet the carbon targets set by the FHS. From the point of full compliance, new homes must be heated by a low-carbon system. In practice, that means one of two things:

• Air source heat pump (ASHP): The most common solution for individual houses. A unit mounted outside the building extracts heat from the air and uses it to heat the home and hot water. Heat pumps are significantly more efficient than boilers in terms of the energy they deliver per unit of electricity consumed, but electricity costs roughly four times more per unit than gas, so the running cost advantage over a modern gas boiler is smaller than it sounds.
• Heat network connection: Where a district or communal heat network is available, connecting to it is an alternative to an individual heat pump. Heat networks are more common in urban areas and in larger developments. In London, some boroughs have existing networks, and new major developments are increasingly required to connect to or contribute to one.

An air source heat pump needs space outside the building for the external unit, adequate internal space for a hot water cylinder and air handling, and a properly sized low-temperature heating system. Heat pumps work best with underfloor heating or large radiators designed for lower flow temperatures. If you are designing a new build now, all of this needs to be in the brief from day one, not retrofitted at the end.

Heat pumps are not a drop-in replacement for a gas boiler. They need to be designed into the building from the start. The heating distribution system, cylinder size, electrical supply capacity, and external unit location all need to be resolved during design, not on site.

2. Solar panels: a mandatory requirement

The FHS introduces a new functional requirement, Requirement L3, for on-site renewable electricity generation. For most new homes, this means roof-mounted solar photovoltaic panels. The required coverage is panels equivalent to 40% of the dwelling’s ground floor area. On a typical three-bedroom house with a ground floor area of around 60m², that means approximately 24m² of solar panels on the roof. The NICEIC’s guidance on the solar requirement has a clear breakdown of how coverage is calculated.

There are exceptions. Higher-risk buildings above 18 metres are exempt from the solar requirement due to roof space limitations and installation complexity. Buildings connected to heat networks are also exempt. And where roof geometry, orientation, or shading genuinely prevents meeting the 40% target, alternative compliance routes are available, though these require documented technical justification.

What this means in practice is that your roof design now needs to accommodate a substantial array of solar panels. South-facing pitches are preferred. Roof lights, dormers, complex hip geometry, and features that reduce usable roof area all complicate compliance. Your architect needs to think about this during massing, not after the roof design has been finalised.

3. Building fabric: better insulation and airtightness

The FHS requires significantly improved performance from the building envelope compared to previous standards. Walls, floors, roofs, and windows all need to perform to tighter specifications.

In real terms, this means thicker insulation throughout, higher specification glazing, and more careful detailing of junctions and penetrations to reduce air leakage. These things cost more but also deliver a home that costs significantly less to run than older housing stock.

4. Ventilation: mechanical systems become standard

A more airtight home needs a proper ventilation strategy. Opening a window is not sufficient. The FHS expects most new homes to include mechanical ventilation, either decentralised mechanical extract ventilation (dMEV) in wet rooms, or a whole-house mechanical ventilation with heat recovery (MVHR) system.

MVHR is particularly effective in very airtight homes. It extracts stale air from bathrooms and kitchens, recovers the heat from that air before it leaves the building, and uses that recovered heat to warm incoming fresh air. A well-designed MVHR system reduces heating demand and maintains good indoor air quality. It also adds to the build cost and requires careful commissioning.

The ventilation design needs to be coordinated with the architectural design from the start. MVHR units need space, ductwork runs need to be planned, and penetrations through the airtight layer need to be managed carefully.

What Does the Future Homes Standard Add to Build Costs?

The government’s own Impact Assessment, published alongside the FHS in March 2026, estimates an additional build cost of approximately £4,350 per dwelling compared to building to Part L 2021 standards. That is a weighted average across all dwelling types. The breakdown is roughly as follows:

These are incremental costs over and above a standard pre-FHS new build. They do not represent the total cost of these items; they represent the extra cost compared to what you would have spent anyway. A larger, more complex house will sit at the higher end of these ranges.

The honest picture on running costs is more nuanced than some of the headlines suggest. An FHS-compliant home will use no gas and will not pay a gas standing charge, which is a real saving. It will also be much better insulated than older homes, which reduces heat loss and therefore heating demand. But electricity currently costs around four times more per unit than gas, which offsets some of the efficiency gain from heat pumps. The government expects the electricity-to-gas price ratio to narrow over the coming decade as the grid decarbonises, at which point the running cost advantage of FHS homes will become more pronounced.

What This Means for Your New Build Project Right Now

If you are at early design stage, here is what the FHS means for the decisions you are making now.

Your architect needs to design for heat pump and solar from the start

This is not a specification decision you make at the end of design. The heat pump external unit needs a location. The hot water cylinder needs space. The electrical consumer unit needs capacity for the heat pump circuit and the EV charging point. The roof needs to be oriented and detailed for the solar array. All of this needs to be in the brief before the first sketch plans are drawn.

Your mechanical engineer is now a key member of the design team

On a pre-FHS project, mechanical and electrical engineering was sometimes an afterthought. Under the FHS it is central. The heat pump sizing, the heating distribution design, the MVHR layout, the solar system specification, and the HEM energy modelling all require a properly briefed M and E engineer from the early stages of design.

The Home Energy Model replaces SAP

The FHS introduces a new energy calculation methodology called the Home Energy Model (HEM), which replaces the Standard Assessment Procedure (SAP) used previously. HEM is a more sophisticated tool that models energy use on a half-hourly basis rather than in simplified monthly averages. During the transitional period to March 2028, SAP 10.3 can still be used. After that, HEM becomes mandatory. Your energy assessor will need to be familiar with the new tool. The HEM Guide website has a clear technical breakdown of what has changed.

Conservation areas and listed buildings present a tension

Solar panels on a new build in a conservation area will attract planning scrutiny. The FHS requires them; the conservation area design guide may resist them. This is a live tension that planning officers are navigating on a case by case basis. In most situations, the requirement to comply with building regulations takes precedence, but your architect should raise this early with the local planning authority rather than assuming it will resolve itself.

The benefits are real, not just regulatory

It is easy to focus on the cost and complexity of FHS compliance. But the homes it produces are genuinely better. Lower energy bills than any home built before these standards. Better indoor air quality. Warmer, more comfortable rooms with less temperature variation. No exposure to gas price volatility. And a property that will be far easier to sell in a market where EPC ratings are increasingly scrutinised by buyers and lenders.

Green mortgages, which offer lower interest rates for homes with EPC A or B ratings, are already mainstream. An FHS-compliant home will achieve these ratings as standard. That is a commercial as well as an environmental benefit.

Building to the Future Homes Standard in London?

We build across all 33 London boroughs and are fully up to speed with the FHS requirements. If you are trying to work out what the standard means for your specific project, whether you fall within the transitional arrangements, or how to design a compliant home without overcomplicating the specification, talk to our team. We will give you a straight answer.

DEVELOPER NOTES

Internal links: /blog/building-regulations-new-builds-london, /contact

External links: gov.uk Future Homes Standard documentation, NICEIC FHS homeowner guide (niceic.com), HEM Guide (home-energy-model.co.uk)

Suggested meta description: The Future Homes Standard was published in March 2026 and comes into force in March 2027. No gas boilers, mandatory solar panels, heat pumps as standard. Here is what it actually means if you are building now.

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Add ‘Last updated: July 2026’ near the top of the page — the regulatory dates in this blog are specific and readers need to know the information is current

Frequently Asked Questions

When does the Future Homes Standard come into force?

The Future Homes Standard was published on 24 March 2026 and comes into force for standard residential buildings on 24 March 2027. There is then a 12-month transitional period running to 24 March 2028, during which projects that submitted building control applications before March 2027 can still build to the older Part L 2021 standard, provided construction starts before March 2028. For higher-risk buildings above 18 metres or seven storeys, the standard comes into force on 24 September 2027.

Are gas boilers banned under the Future Homes Standard?

Not banned in existing homes, but effectively ruled out for new builds. The FHS requires new homes to produce at least 75% less carbon than homes built to 2013 standards. No gas boiler system can meet that target. So while a gas boiler is not explicitly prohibited, it cannot deliver compliance, which means it cannot be used in a new build that needs to pass building regulations. From the point of full compliance, heat pumps or heat network connections are the expected heating solution for new homes in England.

Do I need solar panels on my new build?

Yes, in most cases. The FHS introduces a mandatory requirement for on-site renewable electricity generation. For most homes, this means solar panels covering an area equivalent to 40% of the ground floor area. There are exceptions for higher-risk buildings above 18 metres, for buildings connected to heat networks, and for cases where roof geometry or shading genuinely prevents meeting the coverage target. But for a typical London new build house, solar panels are now a standard part of the specification.

How much does the Future Homes Standard add to build costs?

The government’s own Impact Assessment estimates approximately £4,350 per dwelling in additional build costs compared to Part L 2021 standards. This covers the heat pump, solar panels, enhanced insulation, improved glazing, and mechanical ventilation. Larger or more complex homes will sit at the higher end. These are incremental costs over what you would have spent anyway, not the total cost of these items.

Does the Future Homes Standard apply to extensions and renovations?

The FHS is primarily aimed at new build dwellings. Extensions and renovations are subject to building regulations, but the specific FHS requirements for heat pumps and solar panels do not automatically apply to an extension on an existing home. However, if an extension or renovation is substantial enough to trigger a full energy assessment, the work may need to meet higher energy standards than before. Check with your architect and building control body for your specific situation.

What if my project is in a conservation area and solar panels are a problem?

This is a genuine tension and one that planning departments are actively working through. Building regulations require FHS compliance including solar panels; conservation area policies may resist visible panels on roofs. In practice, building regulations tend to take precedence where the two conflict, but your architect should raise this with the local planning authority at pre-application stage. There are also alternative compliance routes under the FHS where solar is genuinely impractical, though these require documented technical justification rather than a preference to avoid panels.

My project is already underway. Do I need to comply?

It depends when you submitted your building control application and when you started construction. If you submitted a building notice, initial notice, or full plans application before 24 March 2027, and your construction commences before 24 March 2028, you can build to the Part L 2021 standard rather than the FHS. If you are unsure which regime applies to your project, check with your building control body. The transitional arrangements apply to individual buildings, so the position may differ across plots on the 

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Get them right and they will support your home without complaint for a hundred years. Get them wrong and you will be dealing with cracked walls, sticking doors, and expensive remedial work long after you have moved in. In the worst cases, you will be looking at underpinning costs that dwarf what a proper foundation would have cost in the first place.

The foundation type you need depends on your site, your soil, what is growing nearby, and what you are building. There is no universal answer. This guide explains the main foundation types used in UK new builds, when each one is appropriate, and what London’s ground conditions mean for your project specifically. If you have not yet commissioned a ground investigation, our guide to surveys needed before a new build explains why that should come before any foundation design.

Why the Right Foundation Type Matters

A foundation does two things. It transfers the load of the building safely into the ground, and it prevents movement that would cause the structure above to crack or distort.

The challenge is that ground conditions vary enormously, even across a single plot. Soil can be strong or weak, stable or shrinkable, dry or waterlogged. What lies two metres down may be completely different from what is at the surface. And the presence of trees, underground services, water, or made ground from previous development all change the picture.

This is why foundation design is a structural engineering decision, not a contractor guess. Your structural engineer will use the results of your ground investigation to specify the right foundation type and depth for your specific site. If a contractor is telling you what foundation you need before a ground investigation has been done, that is a problem.

Never finalise a foundation design without a ground investigation report in hand. The cost of the investigation is small. The cost of redesigning foundations after work has started, or worse, after problems emerge, is not.

The Main Foundation Types Used in UK New Builds

Strip Foundations

Strip foundations are the most traditional and widely used foundation type for domestic buildings in the UK. A continuous trench is excavated under each load-bearing wall, concrete is poured to form a wide strip, and the walls are then built up from that concrete base.

There are two versions. Traditional strip foundations use a relatively shallow concrete strip with blockwork built up below ground to damp proof course level. Trench fill foundations are deeper and filled almost entirely with concrete, reducing the amount of blockwork needed below ground. Trench fill has become the more common choice for most new builds because it is faster to construct and less labour intensive, even though it uses more concrete.

Strip foundations are well-suited to sites with firm, stable soil where bearing capacity is adequate and ground conditions are predictable. On London clay, depths are often pushed well beyond the standard minimum because of the soil’s shrinkable nature.

Raft Foundations

A raft foundation is a reinforced concrete slab that covers the entire footprint of the building rather than just the lines under the walls. Instead of transferring loads through individual strips, the raft spreads the total load across the whole ground area.

Rafts are used when soil bearing capacity is poor or variable, when differential settlement is a concern, or when the ground conditions make individual strip foundations impractical. They are also used on sites with highly shrinkable clay where the risk of uneven movement between different parts of the strip would be too high.

The raft needs to be stiff enough to resist the ground movement beneath it without cracking. This means thicker concrete and more reinforcement steel than a strip foundation, which pushes the cost up. Typically a raft foundation for a residential new build costs between £120 and £220 per square metre, compared to the linear metre pricing of strip foundations.

A raft is not just a thick floor slab. It is a structural element designed by an engineer to resist specific loads and movements. Do not let anyone tell you a standard ground-bearing slab will do the same job as a designed raft. It will not.

Pile Foundations

Pile foundations transfer the load of the building down through weak or unsuitable near-surface soil to a stronger layer of ground at depth. Piles are long structural columns, either driven or bored into the ground, that carry the building load through whatever poor material is at the surface to reach something capable of supporting it.

There are several types of pile used in residential construction:

• Bored cast in situ piles: A hole is drilled into the ground and filled with reinforced concrete. Suitable for most London sites, quieter than driven piles, and can be designed to very precise specifications.
• Driven piles: Pre-formed concrete or steel piles are hammered into the ground. Fast but noisy and vibration-intensive. Less commonly used in urban residential settings because of the impact on neighbouring properties.
• Mini piles or micro piles: Small diameter piles installed with compact equipment. Useful where access is restricted, headroom is limited, or the site is too constrained for full-size plant. Common on tight urban London plots.
• Screw piles: Steel piles with a helical flight that are screwed into the ground. Quick to install and with no spoil to remove. Suitable for lightly loaded structures and increasingly used for smaller residential projects.

Piles are connected at the top by a pile cap or a ground beam, which then supports the walls or frame above. Pile foundations are more expensive than strip or raft solutions, typically starting at £12,000 and rising substantially on complex sites, but on sites where the near-surface ground is genuinely poor they are often the only viable option.

Pad Foundations

Pad foundations are isolated blocks of concrete that support individual point loads, such as columns in a framed structure. They are less commonly used in traditional brick and block residential new builds, but they appear regularly in timber frame and steel frame homes where the structural load is carried through a series of columns rather than continuous load-bearing walls.

A pad foundation is essentially a thickened concrete base designed to spread the load from a single column or post into the ground below. They are relatively simple and economical for what they do, but they only make sense where the structural arrangement calls for point loads rather than continuous wall loads.

What London’s Ground Conditions Mean for Your Foundation

London is not a simple place to build. The ground across the city varies significantly, and several factors make foundation design here more complex than in many other parts of the country.

London Clay

Much of London, particularly south and west London, sits on London Clay. This is a highly shrinkable soil that expands when wet and contracts when dry. The seasonal movement this creates is one of the most common causes of foundation problems in the UK. The British Geological Survey’s interactive map lets you check the geology under your specific site, and it is worth doing before you commit to anything.

On London Clay, strip foundations typically need to go deeper than they would in other parts of the country. The standard minimum of 450mm that applies in stable conditions is rarely sufficient. Most domestic foundations on London Clay are designed to at least 900mm to 1m, and where trees are present that depth can increase dramatically.

Trees on Clay: the Biggest Variable

If your site has trees nearby, and in London that is more often than not, their interaction with clay soil is one of the most significant factors in your foundation design. Tree roots extract moisture from clay soil, causing localised shrinkage that can extend well beyond the visible canopy. The NHBC Standards Chapter 4.2 provides detailed guidance on foundation depths near trees based on species, mature height, and soil shrinkability.

The practical implications are significant. A mature oak 15 metres from your building on London Clay could require foundation depths of 2.5 to 3 metres under NHBC guidance. That is a very different piece of groundwork to a standard trench fill at 900mm, and the cost difference is substantial.

Trees that have been removed are also a consideration. When a tree is removed, the clay soil it was desiccating begins to rehydrate and swell. This is called heave, and it pushes upward rather than downward. Foundations on a site where trees have recently been removed need to account for heave risk, which may mean a different foundation type or the inclusion of compressible material beneath the slab.

Never remove a tree from a clay site without getting structural engineering advice first. The rehydration of clay after tree removal can cause more damage than the tree itself.

Brownfield and Made Ground

Large areas of London were developed industrially before the current wave of residential development. Brownfield sites often have made ground: fill material of unknown composition placed over the original ground at some point in the past. Made ground can be anything from demolition rubble to industrial waste, and its bearing capacity is unpredictable.

On made ground, strip foundations into the fill material are almost never appropriate. The solution is usually to pile through the made ground to reach a bearing stratum below it, or to use a raft designed to bridge over variable compressibility in the fill. Either way, you cannot design the foundation until you know how deep the made ground goes and what lies beneath it, which is exactly what a Phase 2 ground investigation is for.

High Water Table

Near the Thames and its tributaries, the water table can be close to the surface. This affects foundation design in two ways. First, excavation becomes harder and more expensive because groundwater needs to be managed during the dig. Second, any below-ground structure needs to be designed to resist hydrostatic pressure. Basements in particular require waterproofing systems that are significantly more complex and expensive on high water table sites.

How the Right Foundation Type Gets Chosen

Your structural engineer leads this process. Here is how it works in practice.

• The ground investigation report is reviewed. Soil type, bearing capacity, shrinkability, groundwater level, and contamination are all assessed.
• Any trees within the zone of influence are identified and species are checked against NHBC Chapter 4.2 tables to determine foundation depth requirements.
• The structural loads from the building design are calculated. A heavier structure or one with unusual loading patterns may push toward a more robust foundation solution.
• The engineer selects the foundation type that is safe, appropriate for the ground conditions, and buildable on the specific site.
• Foundation drawings and specifications are produced for building control approval and for the contractor to price and build from.

This process is not optional and it is not something that can be shortcut. Building control will inspect your foundations before the concrete is poured and before any work covers them up. If the foundations do not meet the approved specification, you will be asked to rectify them at your own cost.

Never pour concrete before building control has inspected the foundation trenches. Once the concrete is in, nobody can verify the depth, the soil conditions at the base, or the trench preparation. If your contractor wants to pour before the inspection, stop them.

Foundation Costs: What to Budget

Foundation costs vary significantly based on type, depth, soil conditions, and site access. Here is a realistic guide for a London new build in 2026.

These ranges are starting points. On a constrained London site with deep clay, nearby trees, and restricted access for plant, foundation costs can easily exceed these figures. The ground investigation report is what gives you the information to price foundations accurately before you commit. Pricing foundations without it is guesswork.

If you want to understand where foundations sit within the overall cost of a new build, our guide to new build costs in London covers the full breakdown.

Common Foundation Mistakes and How to Avoid Them

Assuming standard depths will do

The 450mm minimum depth in Building Regulations Approved Document A is an absolute floor that applies in ideal conditions. Virtually no London site qualifies as ideal. Clay soil, nearby trees, made ground, and high water tables all push depths up. Your structural engineer sets the depth, not Building Regulations.

Skipping or skimping on the ground investigation

The ground investigation is what tells your engineer what they are designing for. Designing foundations without it is like specifying a roof structure without knowing what loads will sit on it. The investigation costs a fraction of what a foundation redesign or remediation would cost. Do it properly and do it early.

Not accounting for trees

Trees are one of the most common causes of avoidable foundation problems in London. Any tree within a distance of its mature height from your building on clay soil needs to be assessed against NHBC Chapter 4.2. This includes trees on neighbouring land that you have no control over. If they are there now, they need to be in the foundation design.

Removing trees without engineering advice

Removing a tree to make way for a new build seems straightforward. On clay it can create a heave problem that is worse than the shrinkage risk the tree presented. Always get structural engineering input before removing any significant tree on a clay site.

Not allowing for groundworks contingency

Foundations are where the unexpected happens most often. You dig down and find something that was not in the ground investigation. Made ground deeper than expected. An old wall. A drain not on any record. A pocket of weak soil. Build a contingency of at least 15% into your groundworks budget specifically because of this risk.

The post New Build Foundations Explained: Which Type Do You Need and Why? appeared first on New Build Contractors..

It is one of those scenarios most people never consider when they sign a building contract. You have done your research, agreed a price, work has started, and then one day the phones go quiet. Nobody turns up on site. And you find out your contractor has gone into administration.

It is more common than you might think. Construction consistently accounts for more insolvencies than any other sector in England and Wales. In the 12 months to March 2026, 3,827 construction firms entered insolvency according to the Insolvency Service, representing 16% of all business failures despite the sector making up just 14% of registered UK companies. That is not a small number.

This guide explains what actually happens when a builder becomes insolvent during a new build, what your options are, what protection you might have, and most importantly what you can do before you start to make sure you are not left exposed.

Why Construction Companies Fail

Understanding why builders go bust helps you spot warning signs early. The reasons are almost always the same.

Cash flow problems

Construction is a cash-hungry industry. Materials need to be paid for, wages need to go out every week, and subcontractors need to be paid on time. If a contractor is juggling multiple projects and one goes over budget or a client delays payment, the knock-on effect can collapse the whole business surprisingly quickly. A company can appear perfectly healthy on paper while quietly running out of money in practice.

Fixed-price contracts signed at the wrong time

Many contractors signed fixed-price contracts during periods of lower costs and are now building at a loss because material and labour prices have risen significantly. The margin that looked reasonable at tender is gone by the time the work starts. This has been a significant driver of construction insolvencies since 2022 and the pressure has not fully eased.

Overextension

Some contractors take on more work than they can manage. They use cash from your project to fund another one, and when that other project hits problems, yours suffers. This is sometimes called a Ponzi-style business model, though that makes it sound more deliberate than it usually is. Often it is just poor financial management compounding until something breaks.

Early Warning Signs to Watch For

A builder does not usually go from fine to insolvent overnight. There are almost always signals beforehand if you know what to look for.

• Slow or erratic payments to subcontractors. If subbies are grumbling about not being paid, that is a significant red flag. They will walk off site before you know there is a problem.
• Requests for large upfront payments outside the agreed schedule. If a contractor suddenly needs a big payment early, they may be using your money to cover other commitments.
• Deliveries of materials slowing down or stopping. A builder in financial trouble will often have their credit with suppliers cut off.
• Unexplained gaps in the work programme. If the site goes quiet without explanation, find out why.
• Evasive answers about the programme or finances. Trust your instincts. If your contractor stops giving you straight answers, push harder.
• County Court Judgements against the company. You can check these for free through the 
• County Court Judgements against the company. Check the Registry Trust for any CCJs registered against your contractor. This costs a few pounds and can tell you a lot.

If you are concerned about your contractor’s financial health, act early. It is far easier to deal with a shaky contractor who is still trading than to deal with an administrator after the business has collapsed.

What Happens When a Builder Goes Into Administration

When a business enters administration or liquidation, an insolvency practitioner takes control. From that point, your relationship changes completely. You are no longer dealing with your contractor. You are dealing with someone whose job is to recover money for creditors, not to finish your house.

Your contract is suspended

The building contract effectively goes into suspension. The insolvency practitioner will assess whether completing your project is financially viable for the creditors. In most cases it will not be, and they will terminate the contract.

You become an unsecured creditor

Any money you have paid that has not been matched by completed work puts you in the queue of unsecured creditors. In practice, unsecured creditors recover very little in most construction insolvencies. HMRC, banks, and secured lenders come first. Homeowners without insurance protection often recover nothing.

Materials on site may not be yours

This catches people out. Materials sitting on your site may not legally belong to you if they have not been paid for or if ownership has not formally transferred. The insolvency practitioner may be entitled to recover them. Check your contract. A well-drafted contract will include provisions that transfer ownership of materials to you when they are delivered to site and paid for.

Subcontractors may have claims over the work

If subcontractors have not been paid by your main contractor, they may place liens or claims over work they have completed. This can complicate your ability to bring in a new contractor to finish the job.

Do not make any further payments once you know your contractor is in financial difficulty. Contact a solicitor immediately and do not agree to anything the insolvency practitioner proposes without legal advice. Their job is to recover money for creditors, not to protect your interests.

What Protection Do You Have?

How protected you are depends almost entirely on what you put in place before work started. Here is what can help.

A structural warranty or latent defects insurance

A structural warranty is one of the most important protections for a new build project. The best known provider is NHBC with their Buildmark warranty, but there are other providers including Premier Guarantee, LABC Warranty, and Checkmate. These policies provide cover in three stages.

Not every new build automatically has a structural warranty. If you are commissioning a bespoke new build directly with a contractor, you need to arrange this yourself before work starts. Many mortgage lenders will require a structural warranty on a new build before they will lend, so this is not optional if you are financing the project.

Your building contract

A well-drafted contract protects you in several ways. The JCT Minor Works or Homeowner contracts are standard for residential new builds and include provisions around payment schedules, termination on insolvency, ownership of materials, and retention. Key things to check:

• Payments should be made in arrears against completed work, not upfront.
• Retention: typically 5% of each payment is held back until practical completion and released after a defects period. This gives you leverage and some financial protection.
• Ownership of materials on site should transfer to you on delivery and payment, not when the contractor decides.
• Termination provisions should clearly allow you to terminate and bring in another contractor if the original one becomes insolvent.

Section 75 of the Consumer Credit Act

If you paid for any part of the project by credit card and the amount was between £100 and £30,000, your card provider is jointly liable with the contractor for the goods or services not delivered. This is one of the most underused protections available to homeowners.

It does not cover bank transfers or debit cards. But for deposits, material purchases, or stage payments made by credit card, it can be a significant backstop if your contractor fails.

Site insurance

A contract works or site insurance policy covers the physical build against damage, theft, and unforeseen events during construction. If your contractor holds this policy and goes into administration, the policy may lapse. Make sure you understand who holds the site insurance and what happens to it if the contractor becomes insolvent. On larger projects, consider taking out your own employer’s liability policy that sits alongside the contractor’s.

What to Do Immediately If Your Builder Goes Bust

If you find out your contractor has entered administration or liquidation, there is a clear order of priority.

1. Stop all payments immediately.

Do not pay anything further until you have legal advice. Do not let anyone pressure you into making payments to the insolvency practitioner or to subcontractors without understanding exactly what you are agreeing to.

2. Secure the site.

If work has stopped, secure the site against theft and vandalism. Check your insurance covers the period when no contractor is on site. Notify your insurer immediately.

3. Get all documents off site.

Retrieve all drawings, specifications, building control documents, structural calculations, warranties, test certificates, and any other paperwork associated with the project. If these are held by the contractor, request them formally in writing now. You will need them to appoint a new contractor.

4. Document the state of the works.

Photograph and video the site thoroughly. Record exactly what has been completed, what has been partially completed, and what materials are on site. You will need this to negotiate with the insolvency practitioner and to brief a new contractor.

5. Contact your structural warranty provider.

If you have a structural warranty in place, notify the provider immediately. They will advise on what your policy covers and what steps they can take.

6. Get legal advice.

Construction insolvency is complex. The insolvency practitioner will be experienced at managing these situations in the interests of creditors. You need someone in your corner. A solicitor with experience in construction disputes can advise on your rights, help you recover documents and materials, and guide you through the process of formally terminating the contract and appointing a replacement. The Law Society’s solicitor search lets you filter by construction law specialism.

7. Get the works assessed before appointing anyone new.

Before you bring in another contractor, get an independent assessment of the works completed so far. You need to know what has been done properly, what needs rectifying, and what is genuinely incomplete. Do not rely on the new contractor’s assessment alone because they have an incentive to find more problems.

Finishing the Project: What to Expect

Taking over a half-built project is almost always more expensive and more complicated than starting from scratch. Here is why.

• Every new contractor will price in a risk premium for inheriting someone else’s work. They cannot be certain what is hidden in the structure and they will not want to take liability for work they did not do.
• Subcontractors who worked for the original contractor may be owed money and may be reluctant to return to site or may have moved on to other projects.
• Building control will need to inspect and sign off stages that were not formally inspected during the original build. This can require opening up work.
• The programme will almost certainly be longer than the original timeline suggested. Budget for this in terms of both cost and accommodation.

Get at least three quotes for completing the works. Make sure each contractor quotes against the same specification and the same scope of remaining works. The gap between quotes on a project like this can be very wide.

How to Protect Yourself Before You Start

The best time to deal with contractor insolvency risk is before you sign a contract. These steps cost very little and can save you enormously.

The single most effective protection is a payment schedule that keeps your exposure low at any given point. If you never owe your contractor more than one or two stages of work at any time, the financial impact of an insolvency is manageable. If you have paid for three months of work in advance, it is not.

Choosing the Right Contractor Matters

Most of what is in this guide can be avoided by choosing a contractor with a genuine track record, proper financial backing, and a transparent way of working. We work across all 33 London boroughs and are happy to talk about how we structure our contracts, our payment schedules, and our approach to project management. Get in touch and we will give you a straight answer.

DEVELOPER NOTES

Internal links: /contact

External links: BCIS insolvency data (bcis.co.uk), NHBC Buildmark (nhbc.co.uk), JCT contracts (jctltd.co.uk), Registry Trust (registry-trust.org.uk), Law Society solicitor search (solicitors.lawsociety.org.uk)

Suggested meta description: Construction is the UK’s highest-insolvency sector. Here is what actually happens if your builder goes bust mid project, what your rights are, and how to protect yourself before work starts.

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Consider adding a ‘Last updated: July 2026’ note near the top given the insolvency statistics are current

Frequently Asked Questions

Can I get my money back if my builder goes bust?

It depends on what protection you have in place. If you have a structural warranty with insolvency cover, you may recover your deposit up to the policy limit. If you paid by credit card, Section 75 of the Consumer Credit Act may allow you to claim back from your card provider. If you have neither, you will be an unsecured creditor in the insolvency and the realistic expectation is that you recover very little, sometimes nothing. This is why protection needs to be arranged before work starts, not after something goes wrong.

What is a structural warranty and do I need one?

A structural warranty is an insurance-backed guarantee that covers a new build against structural defects for ten years and provides insolvency protection during construction. The best known provider is NHBC with their Buildmark policy, but there are others. Most mortgage lenders require a structural warranty on a new build property before they will lend. Even if you are not using a mortgage, it is strongly advisable. Our guide to structural warranties covers this in more detail.

What happens to materials on site if my builder goes bust?

Materials on site may not legally belong to you, even if you have paid for them, unless your contract specifically transfers ownership when they are delivered and paid for. The insolvency practitioner may have a right to recover materials that were supplied on credit to your contractor and not yet paid for. This is one of the most important clauses to check in your building contract before work starts.

Can I just hire another contractor to finish the job?

You can, but you should not rush into it. Before appointing anyone new, get an independent assessment of the works completed so far, retrieve all documentation from the original contractor, formally terminate the original contract, and get multiple quotes. A new contractor will always price in a risk premium for inheriting someone else’s work, so expect the cost to finish to be higher than the remaining balance in the original contract would suggest.

What does a JCT contract protect me against?

A JCT contract sets out the rights and obligations of both parties clearly. For insolvency protection, the key provisions are: stage payments in arrears rather than upfront, retention withheld until completion, ownership of materials transferred to you on delivery and payment, and a right to terminate and engage another contractor if the original one becomes insolvent. The JCT Homeowner contract is designed specifically for projects where a homeowner is commissioning work directly from a contractor.

Should I check my contractor’s financial health before signing?

Yes. Check Companies House for the company’s filed accounts, director history, and any outstanding charges or dissolution notices. Check the Registry Trust for County Court Judgements. Ask for references from recent clients and follow them up. A contractor with nothing to hide will welcome this scrutiny.

The post What Happens If Your Builder Goes Bust Mid Project? appeared first on New Build Contractors..

Land is scarce, competition is high, and the best sites never make it to the open market. Most people searching online for months come up empty. That is not because plots do not exist. It is because they are looking in the wrong places.

This guide covers where plots actually come from, how to find them before anyone else does, what to check before you make an offer, and what the buying process looks like. If you want to understand the build side once you have found your site, our guide to planning permission in London is worth reading alongside this.

What Kind of Plot Are You Looking For?

London plots come in a few different forms. Knowing which type suits you helps narrow the search significantly.

Infill plots

A gap between two existing houses. Often a former side return, a demolished outbuilding, or a strip of unused garden. These are the most common type of residential plot in London. They are tight, usually have access constraints, and planning can be tricky because of neighbouring properties. But they exist in almost every borough.

Garden plots

A homeowner sells off part of their garden. Known as backland or garden grabbing in planning circles. Councils have become more resistant to this in recent years, but it still happens. The challenge is access and demonstrating the new dwelling will not harm the character of the area.

Brownfield sites

Former industrial or commercial land. Garages, workshops, petrol stations, small commercial yards. These are increasingly targeted by the government for residential development, which in theory means more sympathetic planning decisions. In practice, contamination, access, and ground conditions add cost and risk. Do your homework before committing.

Buy to demolish

You buy an existing house, knock it down, and build a new one. Often used when a site has planning history or where the existing building is in poor condition. The big advantage is that the principle of residential development is already established. The risk is paying a house price for a site and then having the cost of demolition on top.

Where to Look

Most people start with the big property portals. That is fine, but it is also where everyone else starts. By the time a plot appears on Rightmove, it has usually already been marketed to developers and land agents. You are bidding against people who already knew about it.

Here is where to look instead.

Dedicated plot finding websites

These sites aggregate land listings from estate agents and private sellers across the UK. They are not exhaustive, but they give a reasonable picture of what is openly available. The main ones worth checking regularly are Plotfinder.net, PlotBrowser.com, and PlotSearch via Buildstore. Set up alerts for your target areas so you see new listings immediately.

Land agents

Most high street estate agents do not handle land regularly. But there are agents who specialise in it. Search for land agents in your target borough specifically. Get on their mailing lists. Call them every few weeks. The relationship matters. Agents tip off buyers they know before they list anything.

Property auctions

Auctions are one of the more reliable ways to find plots in London. Land that is hard to finance, has awkward planning, or where a vendor wants a quick sale often ends up here. The main auction houses worth watching are Allsop, Savills, and Barnard Marcus. Completion is usually required within 28 days of the hammer falling, so you need finance lined up before you bid. Check the legal pack carefully before the auction, not after. Use a solicitor experienced in land. The Essential Information Group aggregates auction listings across all the major houses in one place.

Planning applications

This one takes more effort but produces leads nobody else has. Search your target borough’s planning portal for recent applications for new dwellings, extensions, or conversions. Then look at adjacent plots. If someone has built next door, the area is clearly acceptable to planners. Identify the landowners and write to them.

You can also look for permissions that have been granted but where construction has not started. A landowner who has planning but no builder is a potential seller. Search your borough’s planning portal or use Planning Portal’s search tool to find these.

Walk the streets

Sounds obvious. Most people skip it. Put on your shoes and walk your target area. You are looking for gaps between buildings, unused land to the rear of properties, garages that look underused, overgrown plots, and anything that does not obviously fit the surrounding streetscape. Then trace the ownership through Land Registry and write to the owner.

Ownership searches cost £3 per title through the Land Registry online service. Cheap for what it tells you.

The Right to Build register

Every London borough is legally required to maintain a Right to Build register: a list of people who want to self-build in their area. Signing up does not give you a plot directly, but it creates a legal obligation on the council to bring forward sufficient serviced plots to meet demand. Some boroughs take this more seriously than others, but it is worth registering in every borough you would consider building in. You can register through righttobuildportal.org.uk.

Tell people

Architects, planning consultants, structural engineers, and builders all know about sites before they hit the market. If you are talking to professionals as part of your project planning, tell them you are looking for land. Ask them to keep an eye out. Networks surface opportunities that never appear publicly.

What to Check Before You Make an Offer

Finding a plot is step one. Working out whether it is actually viable is step two. These are different things, and plenty of people skip step two.

You do not need answers to all of this before making an offer. But you need them before you exchange contracts. Build a period between offer and exchange to carry out proper due diligence.

Understanding Planning Permission on the Plot

Plots are usually sold in one of three states. Understanding the difference matters because it affects both the price and the risk.

Full planning permission

The best situation. Someone has already done the work of getting a specific design approved. You know the principle is established, you know what you are allowed to build, and you know the council has already assessed the site. You are paying for that certainty in the price.

Read the planning conditions carefully. Some conditions must be discharged before work starts. Others before occupation. Make sure you understand what is required of you before you commit.

Outline planning permission

The principle of building a dwelling has been agreed but the detailed design has not. You still need to submit a reserved matters application covering the appearance, layout, and materials before you can build. This gives you some flexibility on design but you are not as far along as you might think.

Check the expiry date. Outline permissions expire, usually after three years. If permission is close to expiry, that affects your timeline significantly.

No planning permission

The highest risk option and usually the cheapest price. You are buying land that may or may not be buildable, and you are taking on the cost and uncertainty of the planning process yourself.

This is not necessarily a bad deal. If you understand the site well and have done your homework on what the council is likely to accept, the premium you save on the land price can more than offset the cost of getting planning. But never exchange contracts on land without planning permission unless you have a conditional contract that voids if planning is refused. Do not let anyone talk you out of this.

Always use a solicitor experienced in land purchases, not just residential conveyancing. Land has quirks that a standard conveyancing solicitor may miss: restrictive covenants, overage clauses, rights of way, and title defects that can make a site unviable or significantly more expensive.

What Does a Plot Cost in London?

Land prices in London vary enormously depending on location, size, and what planning has already been granted. Here is a rough picture.

These are rough ranges. A plot in Barking with outline planning is a very different proposition to a plot in Islington with full planning for a four-bedroom house.

The way professionals value a plot is to work backwards from the gross development value. If the finished house is worth £900,000 and it costs £550,000 to build including all fees, the residual land value is roughly £350,000. That is a crude version of the calculation, but it is the logic behind how land is priced.

If someone is asking significantly more than the residual calculation supports, ask why. Either they know something you do not, or the price is wrong.

Overage Clauses: What They Are and Why They Matter

An overage clause is a contractual arrangement where the seller gets a share of any increase in value if you obtain more valuable planning permission than existed when you bought the land.

For example: you buy a site with permission for one house. You later get permission for two. The seller has an overage clause entitling them to 25% of the uplift in value. That can be a significant sum of money.

Overage clauses are increasingly common in London land sales. They are not inherently unfair, but you need to understand exactly what triggers them, what percentage applies, how long they run for, and how the uplift is calculated. Your solicitor should review any overage clause carefully before you commit.

Do not assume an overage clause is a minor detail. On a development that gains more planning than expected, the overage payment can be hundreds of thousands of pounds. Model the financial impact before you exchange.

How to Buy: The Process

Land purchases follow a similar process to property purchases but with some important differences.

• Make an offer. This can be conditional on planning, survey results, or finance being in place.
• Instruct a solicitor. Do this immediately. Do not wait until the offer is accepted.
• Carry out due diligence. Title searches, planning history, flood risk, ground conditions, services. Give yourself at least four to six weeks for this before exchange.
• Exchange contracts. This is legally binding. If there is no planning permission on the site, make sure the contract is conditional.
• Pay a deposit. Typically 10% on exchange.
• Complete. The balance is paid and the title transfers to you.

Finance is worth sorting out early. Most high street mortgages do not cover land purchases. You will need either cash, a bridging loan, or a self-build mortgage product. Self-build mortgages release funds in stages tied to construction milestones rather than as a lump sum, which affects your cashflow planning.

Found a Plot? Talk to Us.

We work with clients across all 33 London boroughs, often from before they have even found their site. If you want an honest view on whether a plot is viable, what it is likely to cost to build on, and what the planning environment looks like, get in touch. No pressure, just a straight conversation.

DEVELOPER NOTES

Internal links: /blog/planning-permission-london-guide, /contact

External links: Plotfinder.net, PlotBrowser.com, PlotSearch Buildstore, Essential Information Group (eigroup.co.uk), Land Registry (gov.uk), Planning Portal search, righttobuildportal.org.uk

Suggested meta description: Finding a building plot in London is harder than planning or building. This guide covers where plots actually come from, what to check before you buy, and how to avoid the most common mistakes.

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Frequently Asked Questions

How long does it take to find a building plot in London?

Honestly, it varies a lot. Some people find something suitable within a few months. Others search for two years or more. The people who find plots fastest are usually the ones who are most active: talking to agents regularly, walking their target areas, checking planning portals for leads, and making it known they are looking. Passive searching on the portals tends to take much longer.

Can I buy land without planning permission?

Yes, but be careful. Land without planning is cheaper because the buyer is taking on the risk that permission might not be granted. If you go down this route, always make the purchase contract conditional on obtaining satisfactory planning permission. If permission is refused, the contract should allow you to walk away. Never exchange unconditionally on land without planning unless you have done thorough due diligence and are confident the site is buildable.

What is an overage clause and do I have to accept it?

An overage clause gives the seller a share of any uplift in value if you get better planning than existed when you bought. You do not have to accept one, but in practice many vendors insist on them, particularly if they feel they are selling at less than full development value. If there is an overage clause, negotiate the percentage, the trigger events, and the duration. Get your solicitor to review it thoroughly.

Do I need a solicitor who specialises in land?

Yes. A standard conveyancing solicitor handles house purchases and knows that process well. Land is different. Restrictive covenants, rights of way, overage clauses, conditional contracts, and title defects all require someone who deals with land regularly. Ask specifically whether your solicitor handles land transactions and how many they have done in the last year.

Is it worth registering on the Right to Build register?

It costs nothing and takes a few minutes. Do it in every borough you would consider building in. It will not hand you a plot, but it creates a legal obligation on the council and in some cases has helped planning applications succeed in areas where the council had not met its self-build plot obligations. The marginal effort is low and the potential upside is real.

How do I value a building plot?

Work backwards from the gross development value. Estimate what the finished house would sell for, subtract the total build cost including all fees and contingency, and what is left is roughly what you should pay for the land. If the asking price is significantly above that residual figure, the numbers do not work unless you have a reason to believe your build cost estimate is high or the end value is conservative. Get a quantity surveyor to help with the cost estimate if you are unsure.

The post How to Find and Buy a Building Plot in London appeared first on New Build Contractors..

Can you self-build in London? Absolutely. Thousands of people have done it successfully. The bigger question is whether it is the right approach for your project, your budget and the amount of time you can realistically commit.

London presents unique challenges that you simply won’t encounter elsewhere in the UK. Land is scarce, planning policies are stricter, access can be difficult and construction costs are among the highest in the country. None of these make self-building impossible, but they do make preparation more important than ever.

This guide explains what self-building in London actually involves, the challenges you’ll face, the costs you should expect and how to decide whether managing the project yourself is the right choice.

What Does Self-Build Actually Mean?

Many people assume self-building means physically constructing the house yourself.

In reality, very few self-builders lay bricks, pour foundations or install roofs. Instead, self-building usually means you are responsible for organising the project, making key decisions and appointing the professionals who will deliver the work.

A typical self-build project involves hiring:

• An architect
• A structural engineer
• A planning consultant (where required)
• Building control
• A principal contractor or individual trades
• Utility companies
• Surveyors
• Interior designers, if required

Some people appoint one contractor to manage everything, while others manage individual trades themselves to try and reduce costs.

Is London a Good Place to Self Build?

The answer depends on your circumstances.

London offers excellent opportunities because completed homes command some of the highest property values in the country. Building a bespoke house can create significant value if the project is well managed.

However, London also brings challenges that don’t exist in many other parts of the UK.

You may have to deal with:

• Smaller building plots
• Tight access for machinery and deliveries
• Party wall matters
• Conservation areas
• Tree Preservation Orders
• Underground utilities
• Neighbour objections
• Strict borough planning policies

These factors make careful planning essential before committing to a site.

Finding a Plot in London

Finding suitable land is often the hardest part of any self-build project.

Unlike rural areas, empty plots are relatively uncommon across London. Instead, opportunities often come from:

• Large residential gardens
• Corner plots
• Redundant garages
• Brownfield land
• Former commercial sites
• Demolition and replacement opportunities

Sometimes the best development opportunities are hidden in existing residential streets rather than obvious vacant land.

Before purchasing any plot, investigate:

• Previous planning applications
• Local planning policy
• Access arrangements
• Utilities
• Ground conditions
• Flood risk
• Nearby protected trees
• Rights of way

A cheap plot can quickly become expensive if major constraints are discovered after purchase.

Understanding Planning Permission

Planning permission is one of the biggest hurdles for self-builders in London.

Every borough has its own Local Plan which influences:

• Building size
• Height
• Appearance
• Density
• Parking
• Sustainability
• Impact on neighbours

A proposal that receives approval in one borough may be refused in another.

Many successful projects begin with a pre-application discussion with the local authority before detailed designs are prepared.

Good planning advice early in the process can save months of redesign later.

Building Regulations Are Separate

One common misunderstanding is believing planning permission allows construction to begin.

It doesn’t.

Planning permission confirms the principle of development.

Building Regulations ensure the building is safe, structurally sound and energy efficient.

Approval covers areas including:

• Structural design
• Foundations
• Fire safety
• Drainage
• Ventilation
• Insulation
• Accessibility
• Electrical work

Both approvals are normally required.

How Much Does It Cost to Self Build in London?

Every project is different, but realistic budgeting is essential.

Typical London Costs (2026)

Premium finishes, difficult access, basement construction or complex engineering can increase costs considerably.

Can You Save Money by Managing Trades Yourself?

Some self-builders choose to appoint every subcontractor individually instead of employing one main contractor.

This can reduce contractor overheads, but it also means you become responsible for:

• Programming
• Health & safety duties
• Site coordination
• Material ordering
• Quality control
• Resolving disputes
• Managing delays
• Ensuring work is completed in the correct sequence

For people working full-time, this level of involvement can become extremely demanding.

Any savings achieved through direct management can quickly disappear if mistakes or delays occur.

Common Challenges Self-Builders Face

Every construction project encounters challenges. The difference is how quickly they’re identified and resolved.

Some of the most common issues include:

Unexpected Ground Conditions

Excavation may reveal poor soil, buried foundations or old drainage systems that require redesign.

Material Lead Times

Windows, steelwork and specialist finishes can take weeks or months to arrive if not ordered early.

Budget Drift

Small specification changes throughout the project often have a greater impact than people expect.

Programme Delays

Construction is highly sequential. If one trade falls behind, every following trade can be affected.

Decision Fatigue

A new build requires hundreds of decisions, from brick selections to electrical layouts and heating systems. Being prepared for this level of involvement makes the process much more manageable.

Is It Better to Self Build or Use a Main Contractor?

There isn’t a single answer.

Self-management may suit experienced developers or those with construction knowledge and sufficient time to oversee the project.

For many homeowners, appointing an experienced contractor provides:

• A single point of responsibility
• Better programme management
• Coordinated subcontractors
• Established supplier relationships
• Clear accountability for quality
• Reduced day-to-day involvement

Rather than spending evenings chasing trades or resolving site issues, clients can focus on making key decisions while construction is professionally managed.

Tips Before Starting a Self-Build Project

If you’re considering a self-build in London, it’s worth taking the following steps before committing to a site:

• Research the planning history of the area.
• Obtain realistic construction cost advice before purchasing land.
• Speak with architects and contractors early.
• Allow a healthy contingency within your budget.
• Think about access, neighbours and logistics as carefully as the design itself.
• Avoid making decisions based solely on the purchase price of the plot.

The strongest projects begin with good planning long before construction starts.

Final Thoughts

Self-building in London can be one of the most rewarding ways to create a home that reflects your needs and adds long-term value. It also demands careful planning, realistic budgeting and a clear understanding of the responsibilities involved.

Whether you choose to manage the project yourself or appoint a contractor, success is rarely about rushing into construction. It comes from making informed decisions at the earliest stages, assembling the right team and allowing enough flexibility to deal with the unexpected.

At New Build Contractors, we regularly work with homeowners, developers and landowners across London who are exploring self-build opportunities. Sometimes a client wants complete project management; other times, they simply need practical advice before deciding how to move forward.

If you’re considering a self-build project, an early conversation about your site, budget and ambitions can help you understand what’s achievable before significant time and money are committed.

Frequently Asked Questions

Can anyone self-build a house in London?

Yes. There is no requirement to be a professional builder, but you’ll need planning permission, Building Regulations approval and the right team of consultants and contractors to deliver the project safely and legally.

Is self-building cheaper than buying a house?

It can be, particularly if you secure a well-priced plot and manage the project efficiently. However, professional fees, planning costs and unexpected construction issues need to be factored into your budget.

How long does a self-build take in London?

Most single-house projects take 12 to 24 months from initial design to completion. This includes planning, detailed design, approvals and construction.

Can I get a mortgage for a self-build?

Yes. Several UK lenders offer self-build mortgages, although they usually release funds in stages as the project progresses.

Do I need a main contractor?

Not always. Some self-builders manage trades directly, while others appoint a principal contractor to oversee the entire build. The right approach depends on your experience, available time and the complexity of the project.

The post Can You Self Build in London? What You Need to Know (2026 Guide) appeared first on New Build Contractors..

Building regulations set the minimum legal standards for construction in England. They cover everything from how strong your foundations need to be, to how much heat your walls are allowed to lose, to where your smoke alarms go. If your build does not meet them, you cannot legally occupy the property. And if you try to sell it later without the right paperwork, you will run into serious problems.

The regulations have also changed significantly in the past few years. If you are planning a new build in London in 2026, you are building to a different set of energy standards than someone who built five years ago. This guide explains how building regulations work, what the main parts cover, how the process runs from start to finish, and what has changed recently. If you have not yet sorted planning permission, our guide to planning permission in London covers that process in full.

Planning Permission vs Building Regulations: What Is the Difference?

These two things get confused regularly, and it is worth being clear about the distinction from the start.

Planning permission controls whether you are allowed to build at all and what the building can look like from the outside. It is concerned with the impact of your development on the surrounding area: scale, appearance, neighbour amenity, and so on.

Building regulations control how the building is constructed. They are about safety, health, energy performance, and the technical standards of the build itself. They apply whether or not planning permission is required.

You can have planning permission without building regulations approval, and you can need building regulations approval for work that does not need planning permission. On a new build you will almost always need both, and they run as parallel processes managed by different people.

A common mistake is treating building regulations as something to deal with after planning. In practice, your architect and structural engineer should be designing to building regulations standards from day one. Retrofitting compliance at the end is expensive and sometimes impossible.

What Are the Approved Documents?

Building regulations in England are published as a series of Approved Documents, each covering a specific aspect of construction. You do not have to follow these documents to the letter; they are guidance rather than law. But if you depart from them, you need to demonstrate an alternative way of achieving compliance, which in practice means more work and more risk. Most builds follow the Approved Documents closely.

Here is what the main ones cover and why they matter for a new build:

Not every part will be relevant to every build, but for a new dwelling in London, most of them will come into play at some stage.

What Has Changed in 2025 and 2026?

This is the area that catches the most people out, particularly those who built or extended a property a few years ago and assume the rules are the same.

They are not.

Energy efficiency: Part L and the Future Homes Standard

The biggest change in recent years is to Part L, which governs energy efficiency. New homes built from 2025 onwards must produce approximately 75 to 80% less carbon dioxide than those built under the 2013 regulations. That is a significant jump.

In practice this means much better insulation throughout the building envelope, higher performance windows and doors, much tighter airtightness standards, and in most cases a low carbon heating system rather than a gas boiler. Air source heat pumps have become the standard heating solution for new builds in London, and the design of the home needs to accommodate them from the start rather than as an afterthought.

Solar panels are increasingly expected, and the Building Regulations etc. (Amendment) (England) Regulations 2026, published in March this year, introduced a new requirement for on-site renewable electricity generation when a new dwelling is constructed. This brings the Future Homes Standard into force in stages, with full implementation expected to come into effect from March 2027.

If you are at early design stage, make sure your architect and mechanical engineer are designing to the current Part L standards, not to what was required three or five years ago. The gap is large and catching up is costly.

Overheating: Part O

Part O was introduced in 2022 and is still relatively new in practice. It applies to all new residential buildings and requires designers to demonstrate that the home will not overheat in a warming climate.

This is more relevant than it sounds. A home built to today’s airtightness and insulation standards retains heat very effectively, which is great in winter and a significant problem in summer. Part O requires a combination of passive measures (limiting solar gain through glazing orientation and sizing) and active measures (opening windows, mechanical ventilation) to keep internal temperatures within acceptable limits.

In London, overheating is taken more seriously than in many other parts of the country. The urban heat island effect means city temperatures are already higher than surrounding areas, and south-facing glazed extensions or rooms with large roof lights can become genuinely uncomfortable without proper design.

Fire safety: Part B

Following the Grenfell Tower fire and the subsequent review of fire safety standards, Part B has been significantly strengthened for higher risk buildings. For new residential buildings over 18 metres in height, a requirement for second staircases comes into force in England on 30 September 2026. This was already a requirement of the Greater London Authority for tall residential buildings in London, so London developers have been working to this standard for some time. If your project is a taller residential development, check the current requirements carefully with your architect and the Building Safety Regulator.

For straightforward single-family new builds, Part B requires a working smoke alarm on every floor, heat alarms in kitchens, interconnected alarms throughout the property, fire doors where required, and clear means of escape from all habitable rooms.

Electric vehicle charging: Part S

All new residential buildings must now include infrastructure for electric vehicle charging. For a single new dwelling with associated parking, this means a dedicated EV charging point. Your electrical design needs to include this from the start, as it requires a dedicated circuit from the consumer unit to the parking space.

How Does the Building Control Process Work?

Building control is the system that checks your build actually complies with building regulations during construction. It runs from before work starts through to completion, and it ends with a completion certificate that you will need to keep safely for the life of the building.

Step 1: Submit a full plans application

For a new build, you will almost always submit a Full Plans application to building control before construction starts. This involves submitting detailed architectural drawings, structural calculations, energy assessments, and specifications for review and formal approval. You can submit to your local authority building control department, or to a private Approved Inspector. The Planning Portal has a list of registered Approved Inspectors if you want to explore the private route.

Private Approved Inspectors are often faster and more responsive than local authority building control, but both routes are legally valid. For most London new builds, the choice comes down to speed, service, and the relationship your contractor has with a particular body.

Step 2: Start on site and notify building control

Before work begins, you must notify building control. From that point, you are responsible for giving adequate notice at each key stage of the build so that inspections can take place. These typically include:

• Commencement of works
• Foundation excavations (before concrete is poured)
• Damp proof course installation
• Oversite concrete or ground floor construction
• Drains (before backfilling)
• Structural frame and roof
• Insulation installation
• Completion

The inspector visits at each notified stage and checks that the work meets the required standard before you cover it up and move on. If they find a problem, they will tell you what needs to be rectified before the next stage can be signed off.

24 to 48 hours notice is typically required before each inspection. Build this into your construction programme and make sure your site manager knows when each notification needs to go in.

Step 3: Final inspection and completion certificate

Once all the work is complete and the final inspection is passed, building control issues a completion certificate. This is one of the most important documents your build produces.

Without it, you cannot legally sell the property. Solicitors acting for buyers will require it. Mortgage lenders will ask for it. If you try to sell a property built without building regulations approval or without a completion certificate, you will face significant delays and legal complications that are expensive and stressful to resolve.

Keep this document securely, alongside your planning consent and any other approvals. If you ever need to sell, remortgage, or make an insurance claim, it will be asked for.

Energy Assessments and SAP Calculations

Every new dwelling in England requires a Standard Assessment Procedure (SAP) calculation to demonstrate compliance with Part L. This is a technical calculation carried out by an accredited energy assessor that models the energy performance of the home. It is used to produce the Energy Performance Certificate (EPC) that every new build must have before it can be occupied or marketed. You can find an accredited SAP assessor through Elmhurst Energy’s search tool.

The SAP calculation needs to be done at two stages. The first is a Design Stage SAP, submitted with your building regulations application to demonstrate that the proposed design will meet the energy targets. The second is an As Built SAP, carried out after construction is complete and reflecting any changes made during the build. The As Built SAP is what produces the final EPC.

In practice this means your architect, mechanical engineer, and SAP assessor need to be working together from the start of the design process. The insulation specification, window sizes and orientations, airtightness target, heating system, and renewable energy provisions all feed into the calculation and cannot be treated in isolation.

Anything Different About London Specifically?

Building regulations are national, so the Approved Documents apply the same way across England. But there are a few things that are particular to London that are worth knowing about.

The London Plan

The London Plan is the strategic planning document for Greater London, produced by the Mayor. It adds requirements on top of national planning policy in several areas that affect building design, most significantly around energy and sustainability. New developments in London are expected to achieve zero carbon on site or offset the remaining emissions through a contribution to the borough’s carbon offset fund. This goes further than national building regulations.

Biodiversity Net Gain

The London Plan also requires developments to achieve a measurable uplift in biodiversity. From April 2024, Biodiversity Net Gain became a mandatory requirement nationally for most planning permissions, requiring a minimum 10% uplift over the pre-development baseline. In London, the Mayor’s guidance pushes for more than the national minimum on larger sites. This affects how your site is designed and landscaped, and you will need an ecological baseline assessment to quantify the gain. Our guide to surveys needed before a new build covers ecological surveys in more detail.

The Building Safety Regulator

The Building Safety Regulator became an independent statutory body in January 2026. For most single-family new builds in London, its direct involvement is limited. But if your project involves a building over 18 metres or seven storeys, you are now working within a more tightly regulated regime that includes the Gateway system: formal checkpoints before you can start work and before you can occupy the building. If your project falls into this category, seek specialist advice from your architect and consult the Building Safety Regulator’s guidance directly.

Common Mistakes Homeowners Make with Building Regulations

These come up regularly in our experience working across London boroughs.

Leaving the energy assessment too late

Some clients treat the SAP calculation as an administrative task to be done near the end of the project. It is not. It is a design tool. If the energy performance of your proposed design is not modelled until late in the process, you may find that you need to make significant and expensive changes to achieve compliance.

Not notifying building control at the right stages

If work is covered up before a building control inspector has signed it off, you may be required to open it up again for inspection at your cost. This is particularly relevant for foundations, drains, and insulation. Make sure whoever is managing the site knows when each notification needs to go in.

Assuming the completion certificate will arrive automatically

It will not. You need to notify building control that the work is complete and request a final inspection. If you move in without doing this, the completion certificate may never be issued, which creates a problem when you come to sell. Chase it before your builder demobilises from site.

Not keeping the paperwork

Completion certificates, energy performance certificates, structural warranties, fire safety documents, and electrical installation certificates all need to be kept for the life of the building. Create a property file from day one and make sure everything goes into it. Future owners and mortgage lenders will need these documents.

Building a New Home in London?

We work across all 33 London boroughs and manage every stage of the build process, including building regulations compliance and building control sign-off. If you want a team that handles this properly so you are not left chasing paperwork at the end, talk to us about your project.

DEVELOPER NOTES

Internal links: /blog/planning-permission-london-guide, /blog/what-surveys-do-you-need-before-a-new-build, /contact

External links: gov.uk Approved Documents, Planning Portal building control, HSE Building Safety Regulator, London Plan (london.gov.uk), Elmhurst Energy SAP assessors

Suggested meta description: Building regulations for new builds in London explained clearly: what the approved documents cover, how building control works, what has changed in 2025 and 2026, and the mistakes to avoid.

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Consider adding a ‘Last updated: June 2026’ note near the top, as the regulatory context is evolving quickly

Frequently Asked Questions

Do I need building regulations approval for a new build in London?

Yes, without exception. Building regulations approval is a legal requirement for all new dwellings. There is no exemption for residential new builds. You must submit an application, have the work inspected at key stages, and receive a completion certificate before the property can legally be occupied.

How long does building regulations approval take?

A Full Plans application must receive a decision within five weeks, or eight weeks if you agree an extension with the building control body. In practice, this is the approval of your submitted drawings. Inspections during the build happen as you notify at each stage. The final completion certificate is issued after the final inspection, typically within a few weeks of the build finishing, provided everything is in order.

Can I use a private building control inspector instead of the council?

Yes. Approved Inspectors are private companies registered with the Construction Industry Council that can carry out building control functions instead of the local authority. They are often faster and more flexible than local authority building control, and the choice is yours. Both routes produce legally equivalent outcomes. A list of registered Approved Inspectors is available through the Planning Portal.

What happens if work does not comply with building regulations?

The local authority has enforcement powers and can require you to alter or remove non-compliant work at your own cost. If you have already moved in or sold the property, you can still face enforcement action. This is why it is important to use a competent contractor, notify building control at the right stages, and not cover up work before it has been inspected.

What is an Energy Performance Certificate and do I need one?

An EPC is a document that rates the energy efficiency of a property on a scale from A to G. All new dwellings must have a valid EPC before they can be sold or rented out. For a new build, the EPC is produced from the As Built SAP calculation. It is a legal requirement, not optional. Your SAP assessor produces it once the build is complete and the final calculations are confirmed.

Does building regulations approval expire?

A building regulations approval does not expire, but the standards it was approved under may become outdated if significant time passes before work starts. If you receive building regulations approval and do not start work for several years, it is worth checking with your building control body whether the approval still reflects current standards, particularly around energy efficiency, which has changed significantly in recent years.

The post Building Regulations for New Builds in London: What Homeowners Need to Know appeared first on New Build Contractors..

That is a mistake that costs more to fix than it would have cost to avoid. What is under your site, around it, and above it can all affect what you are allowed to build, how you build it, and what it ultimately costs. Finding out late in the process, or worse, after work has started, is one of the most expensive ways to run a construction project.

This guide covers every survey you are likely to need before a new build in London. Some are mandatory. Some are strongly advisable. All of them exist for good reason. If you want to understand the broader process before diving in, our guide to planning permission in London covers the application process in detail.

Quick Reference: Surveys at a Glance

1. Topographic Survey

This is the one survey that applies to every single new build project, no exceptions. A topographic survey produces an accurate measured drawing of the site: levels, boundaries, existing structures, trees, access points, and any other features that will affect the design.

Your architect cannot produce meaningful drawings without this. Your structural engineer cannot design foundations without knowing the levels. Your drainage engineer cannot design drainage without understanding how the land falls. Everything starts here.

Costs vary depending on site size and complexity but typically run from £500 to £2,000 for a residential plot. It is one of the cheapest surveys on this list and one of the most important.

Commission this before you commission any design work. Any drawings produced without an accurate topo survey will likely need to be redone once the survey is in.

2. Ground Investigation Survey

This is the survey that tells you what is actually in the ground beneath your site. What type of soil is it? How strong is it? Is the water table high? Is there anything in the ground that could affect how you build, or what it costs to build?

In London, ground conditions vary enormously across relatively short distances. Clay soils in much of south and west London can shrink and swell significantly depending on moisture levels, which directly affects foundation design. Former industrial sites may have backfill or voids. Sites near the Thames or its tributaries may have a high water table or made ground going back hundreds of years.

A ground investigation typically starts with a Phase 1 desk study: a review of historical maps, records, and environmental data to understand what the site has been used for and what ground conditions are likely. If that desk study identifies potential issues, a Phase 2 intrusive investigation follows. This involves boring holes or digging trial pits to take soil samples for analysis. Costs start at around £1,500 for a basic residential plot investigation and rise significantly for complex or contaminated sites. The Environment Agency’s land contamination risk management guidance explains how councils assess contamination risks at the planning stage.

If you are building on a brownfield site, or a site with any kind of previous industrial or commercial use, a ground investigation is effectively mandatory. Most London boroughs will require it as a condition of planning permission. But even on apparently clean sites, knowing what is in the ground before you design the foundations can save tens of thousands of pounds.

Do not wait for the council to require this as a planning condition. Commission it early and use the results to inform your foundation design from the start. Discovering ground problems after your foundations are designed means redesign costs on top of remediation costs.

3. Ecological Survey

If your site has any trees, hedgerows, areas of scrub or grassland, a pond, a watercourse, or any existing buildings that have been unused for a period, you may need an ecological survey before you can submit a planning application.

The survey assesses whether any protected species are present on or near the site. Bats, great crested newts, badgers, and certain bird species all have legal protection under UK and European wildlife law. If your development could affect them, the council will require evidence that the impact has been assessed and mitigated.

Ecological surveys are time sensitive. Many protected species can only be surveyed at specific times of year. Bat surveys, for example, must usually be carried out between April and October, with peak activity surveys in summer. If you miss the survey window, you can add months to your programme. The Chartered Institute of Ecology and Environmental Management publishes guidance on survey seasons and requirements for different species.

The London Plan also requires developments to achieve a measurable Biodiversity Net Gain, meaning your project needs to leave the natural environment in a better state than it found it. An ecological survey is the baseline that makes that calculation possible.

If there is any chance you need an ecological survey, commission it as early as possible. Missing the survey season is one of the most common causes of avoidable programme delays on London new build projects.

4. Tree Survey (BS 5837)

Any tree on or near your site that could be affected by the development needs to be surveyed and categorised before you design. The standard used in the UK is BS 5837:2012, which gives each tree a category from A (high quality and value) through to U (unsuitable for retention).

The survey also establishes the Root Protection Area for each tree: the zone around the trunk where excavation and construction activity could damage the root system. Your building and any associated works need to stay outside these zones, which significantly affects what you can build and where.

In London, many trees are also protected by Tree Preservation Orders. Carrying out work that damages or removes a protected tree without consent is a criminal offence. Your architect needs to know the exact location, crown spread, and root protection area of every significant tree on and adjacent to the site before finalising the layout.

You can check whether trees on your site are subject to a Tree Preservation Order using your council’s interactive planning map, or by contacting the local planning authority directly. The Planning Portal has a tool to help locate TPO information for your specific area.

A tree survey done early gives your architect the information they need to design around existing trees rather than through them. Late tree surveys often result in designs that need significant revision.

5. Bat Survey

Bats and their roosts are protected under the Wildlife and Countryside Act 1981 and the Conservation of Habitats and Species Regulations 2017. If your site includes any buildings, mature trees, or features that could support bat roosts, and your development could affect them, a bat survey will be required.

A bat survey involves two stages. First, a preliminary roost assessment: a qualified ecologist visits the site and assesses its potential to support bats based on what they observe. If that assessment identifies potential, activity surveys follow. These typically involve surveyors using bat detectors at dusk and dawn on multiple visits across the active season.

If bats are confirmed, your development cannot proceed without a European Protected Species licence from Natural England. Getting that licence requires a mitigation strategy, which needs to be designed into the project from the start rather than added later.

If your site has mature trees or any building that has been unused, start the bat survey process as early as you possibly can. The surveys can only happen in season, licences take time to obtain, and the whole process can add six months or more to a programme if it catches you by surprise.

6. Flood Risk Assessment

If your site falls within Flood Zone 2 or Flood Zone 3 as defined by the Environment Agency, a Flood Risk Assessment is required as part of your planning application. You can check which flood zone your site falls in using the Environment Agency Flood Map for Planning.

Even in Flood Zone 1 (the lowest risk category), a site can still be at risk from surface water flooding, groundwater flooding, or flooding from an ordinary watercourse rather than a main river. If the council has any concerns about flood risk on your site, they will require an assessment regardless of the flood zone designation.

A Flood Risk Assessment looks at the likelihood and consequences of flooding, the impact your development might have on flood risk elsewhere, and what measures you are taking to manage the risk on site. For residential development, the sequential test also applies: you need to demonstrate that there is no reasonably available alternative site in a lower risk flood zone.

In parts of London, particularly areas close to the Thames and its tributaries, flood risk is a genuinely live issue. Getting the assessment done early tells you whether your site is even viable before you spend heavily on other surveys and design work.

7. Contaminated Land Assessment

Separate from the ground investigation but often carried out alongside it, a contaminated land assessment specifically looks at whether the ground contains substances that could be harmful to people who live or work on the site.

In London, a huge proportion of the land that is now being used for residential development was previously industrial or commercial. Former petrol stations, dry cleaners, factories, gasworks, and railway land can all leave chemical contamination in the soil that persists for decades or longer.

The assessment follows a two-phase process. Phase 1 is a desk study reviewing historical maps, aerial photographs, environmental databases, and geological records to identify any potential sources of contamination. Phase 2 follows if Phase 1 identifies risks, and involves taking soil and groundwater samples for laboratory analysis.

If contamination is found, you will need a remediation strategy, signed off by the council’s environmental health team, before planning permission will be granted. The cost of remediation varies enormously depending on what is found and how extensive it is.

If you are buying a brownfield plot, commission a Phase 1 desk study before exchange of contracts. Discovering serious contamination after you own the land is a very different problem to discovering it before you buy.

8. Archaeological Desk Study

London has been continuously inhabited for over two thousand years. That means almost any site in the city has some potential for archaeology, and planning conditions requiring archaeological investigation are common.

An archaeological desk study reviews what is known about the history of a site and the surrounding area. It draws on the Historic Environment Record maintained by Historic England, historical maps, archive records, and any previous site investigations. The study assesses how likely it is that significant archaeological remains survive on the site, and what impact the development might have on them.

If the desk study identifies significant potential, the council may require a watching brief during groundworks: an archaeologist present on site while excavation takes place, ready to record and report anything that is found. In rare cases, more extensive archaeological excavation is required before development can begin.

For most straightforward new build sites in London, this is a planning condition rather than a pre-application requirement. But in areas with known archaeological sensitivity, such as the City, Southwark, or anywhere near a Roman or medieval road, it is worth raising with the council at pre-application stage.

9. Utility and Services Survey

Before any groundworks start on site, you need to know exactly where every underground utility is. Gas mains, water mains, electricity cables, telecoms infrastructure, and sewer pipes all run through London’s ground at various depths and in various directions. Striking one during excavation can be dangerous, expensive, and very disruptive.

Utility records can be requested from individual utility companies, or you can use a service like Linesearch Before U Dig which aggregates records from multiple providers. These records give you an indication of where services are, but they are not always accurate to the centimetre. For high-risk areas, a ground-penetrating radar or cable avoidance tool survey is strongly advisable before any intrusive ground investigation or excavation begins.

In London, old utilities are sometimes unrecorded. The older the area and the more previous development the site has seen, the higher the risk of encountering something unexpected. Budget for this contingency in your groundworks programme.

10. Party Wall Survey

If your new build is within three to six metres of a neighbouring property, or if you are building on or at the boundary line, the Party Wall etc. Act 1996 applies. You are required to serve notice on affected neighbours before work begins. If they consent, no further action is needed. If they dissent or do not respond within the required timeframe, a party wall surveyor needs to be appointed.

A party wall surveyor assesses the condition of neighbouring properties before work starts, agrees a method of working that protects those properties, and provides a mechanism for resolving any disputes about damage that occurs during construction.

This is not a planning survey; it does not form part of your planning application. But it is a legal requirement that needs to be managed carefully, and it can affect your construction programme if neighbours are unresponsive or appoint their own surveyors who move slowly.

Serve party wall notices as early as you practically can. Neighbours have two months to respond, and that waiting period sits on your critical path. Start the process before your groundworks contractor is ready to mobilise, not after.

What Does It All Cost?

Survey costs vary depending on site size, complexity, and what is found. Here is a rough guide for a typical London residential new build:

For a typical London new build on an urban plot, budget somewhere between £5,000 and £15,000 for surveys before you start on site. That sounds like a lot. But set it against the cost of discovering a ground problem after your foundations are designed, or missing the bat survey season and losing six months from your programme, and it looks like excellent value.

Planning a New Build in London?

We work across all 33 London boroughs and can advise on what surveys your specific site is likely to need before you commit to anything. Talk to our team and we will give you an honest view of what comes next.

DEVELOPER NOTES

Internal links: /blog/planning-permission-london-guide, /contact

External links: Environment Agency flood map, Environment Agency land contamination guidance, Planning Portal TPO info, CIEEM, Historic England, Linesearch Before U Dig, Party Wall Act gov.uk

Suggested meta description: From ground investigations to bat surveys, here is every survey you are likely to need before starting a new build in London, and why getting them early saves time and money.

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Frequently Asked Questions

Are surveys mandatory before a new build in London?

Some are and some are not, but the distinction matters less than you might think. A topographic survey is effectively mandatory because no architect can produce accurate drawings without one. A ground investigation is required as a planning condition on most brownfield sites. Ecological surveys, flood risk assessments, and contaminated land assessments are all required when specific triggers are met. The ones that are not strictly mandatory, like utility surveys, are still strongly advisable because the alternative is starting groundworks blind.

Can I commission all the surveys at once?

Most of them yes, but not all. Ecological and bat surveys are season dependent and can only be carried out at certain times of year. Everything else can generally be commissioned simultaneously, which is the most efficient approach. Coordinate them through your architect or project manager so the results feed into the design at the right point in the programme.

Who pays for the surveys?

The developer or landowner commissions and pays for pre-construction surveys. If you are using a contractor for the full project, they should not be expected to commission surveys as part of their scope. These are client responsibilities that sit before the build contract is signed.

What happens if a survey finds a problem?

It depends on what the problem is. A ground investigation that reveals difficult soil conditions leads to a revised foundation design, which costs more but is manageable. A contaminated land assessment that finds serious contamination means a remediation strategy before the council will grant planning permission, and that can be expensive. A bat survey that confirms a roost means getting a European Protected Species licence before work can start. None of these are necessarily fatal to a project, but they all affect the programme and the budget. Finding out early gives you options. Finding out late takes options away.

How long do surveys take?

A topographic survey can usually be completed within a week or two of instruction. A ground investigation typically takes four to eight weeks from instruction to receiving the final report. Ecological surveys are the most time-sensitive because survey seasons are fixed: if you miss the window for bat surveys in October, you are waiting until the following spring. Allow at least three to six months for the full suite of surveys on a complex urban site.

Do I need a survey if I am building on a plot that has already had a building on it?

Yes. In some ways, a previously developed site carries more uncertainty than a greenfield site. Old foundations, backfill, made ground, and services from previous buildings all affect what you find when you dig. A topographic survey and ground investigation are just as important on a cleared urban plot as they are anywhere else.

The post What Surveys Do You Need Before a New Build Project? appeared first on New Build Contractors..

But here is the thing: most planning rejections are not random. They follow predictable patterns. And once you understand what those patterns are, you can design around them before you ever submit an application.

London has over 300 conservation areas, 33 separate borough planning departments, and some of the most densely packed housing stock in the country. That combination makes it a trickier planning environment than most of England. But it is not impossible. Government figures for late 2025 show that councils across England approved around 90% of householder planning applications. The 10% that get refused almost always fall into a handful of well-known categories. This guide covers all of them. If you are planning a new build in London or a significant extension, read this before you submit anything.

1. The Design Is Out of Character with the Area

This is probably the most common reason applications get turned down. Every London borough has a Local Plan, and within that plan there are detailed policies about design. Materials, scale, massing, roof lines, window proportions: all of it matters.

A planning officer will look at your proposal and ask whether it fits in with what is already there. If your design clashes with the surrounding street scene, they will say so. This is not subjective in the way people assume. Officers refer back to written policy, conservation area appraisals, and design guides when making the call.

The fix is straightforward in theory but requires real effort in practice. Your architect needs to understand the character of the area, not just the technical requirements. That means looking at what materials neighbouring properties use, how windows are proportioned, what the roofline looks like, and how your building will sit alongside others when you look at the street as a whole.

Tip: Read your borough’s design guide and conservation area appraisal before you start designing. Most councils publish these on their websites. They tell you exactly what officers are looking for.

2. Overlooking and Loss of Privacy

This one comes up constantly in London, and it makes sense when you think about how close together properties are. If your proposal includes new windows, a balcony, or a roof terrace that looks directly into a neighbour’s garden or habitable rooms, you are going to have a problem.

Most London boroughs apply what is called the 21 metre rule: there should be at least 21 metres of separation between facing windows in habitable rooms. For side windows at oblique angles, this reduces to around 12 metres. These are not hard rules that automatically cause a refusal, but if your design falls short of them you need a very good reason why. You can read more about how councils assess this in the Planning Portal’s guidance on privacy and overlooking.

Balconies and roof terraces are particularly tricky in London. Even if a balcony faces away from direct neighbours, it can still create an overlooking issue at an angle. Officers will look at exactly where people standing or sitting on that balcony would be able to see, and if the answer is into a neighbouring garden or bedroom window, the application will likely fail.

Tip: Consider obscured glazing for side windows, or position new openings carefully to avoid sight lines into neighbouring properties. A daylight and sunlight assessment submitted with your application can demonstrate that you have thought about this properly.

3. Loss of Light to Neighbouring Properties

Closely related to overlooking, but treated separately by planning officers. This is about the physical impact of your building on the amount of natural light that reaches your neighbour’s windows and garden.

The main tool councils use to assess this is the 45 degree rule. Imagine a line drawn at 45 degrees from the centre of your neighbour’s nearest ground floor window. If your proposed extension or building breaks through that line, the council is likely to consider it an unacceptable loss of light. This applies to both the plan view (depth of the extension) and the elevation view (height of the extension). You can find a clear explanation of how this works on Urbanist Architecture’s 45 degree rule guide.

In London this comes up more often than people expect. Properties are close together, gardens are short, and rear elevations face directly onto neighbouring gardens at tight angles. Even a modest single storey extension can fail the 45 degree test if the site is constrained enough.

The 45 degree rule is not quite as rigid as it sounds. If your extension only breaches the line slightly, and the affected window also has other principal windows that remain unaffected, some councils will still approve it. But you need to make that case clearly in your application.

Tip: Get your architect to run the 45 degree test early in the design process, not after you have finalised the drawings. Small changes to the footprint or roof pitch can often bring a design back into compliance.

4. The Proposal Overdevelops the Plot

London plots are often small. And when you are trying to squeeze as much space as possible onto a constrained site, it is easy to tip over into what planners call overdevelopment.

Overdevelopment typically means the building or extension is disproportionate to the plot size. Common signs that a council will flag this include: the proposal leaves very little garden space, the footprint covers too high a proportion of the plot, the building is too bulky relative to neighbouring properties, or the design tries to cram in too many units.

There is no single threshold that defines overdevelopment. Each borough has its own policies on minimum garden sizes, plot coverage ratios, and separation distances between buildings. The London Plan also sets out broader principles that councils apply.

The practical solution is to understand what your borough’s Local Plan says about these thresholds before you design anything. Our guide to planning permission in London walks through how to read a Local Plan and what to look for.

Tip: If you are pushing the boundaries of what the site can accommodate, do not rely on the planning application to make the case. Engage in pre-application discussions with the council first. It costs a small fee but can save thousands in abortive design work.

5. Conservation Area Rules Are Not Met

London has over 300 conservation areas. If your property sits within one, or even adjacent to one, the scrutiny on your application goes up significantly. Permitted development rights are often removed in conservation areas through Article 4 Directions, meaning things that would normally not need planning permission do require it. You can check whether your property is in a conservation area using your council’s planning map.

Within conservation areas, officers pay very close attention to materials, window styles, roof forms, and the way the new building relates to its historic context. Using modern materials where traditional ones are expected, or proposing a contemporary design in an area with strong Victorian or Georgian character, will almost always attract a refusal.

If the property is a listed building, the bar is even higher. You need both planning permission and Listed Building Consent, and any alterations must preserve the building’s character and historic significance. Even internal alterations can require consent if they affect significant historic fabric.

Tip: Engage a heritage consultant before you design anything in a conservation area. Their input at the start of the project is far cheaper than redesigning after a refusal.

6. Incomplete or Inaccurate Application Documents

This one feels avoidable because it is. And yet it still accounts for a significant number of refusals, or at best delays that set a project back by months.

Planning applications in London require a range of supporting documents depending on the scale and type of the project. At minimum, you will need a completed application form, ownership certificates, a site location plan, and existing and proposed drawings. Larger projects may also need a Design and Access Statement, a planning statement, an energy statement, a daylight and sunlight assessment, an ecology report, a transport statement, or a heritage impact assessment.

If any of these are missing, inaccurate, or not drawn to the right scale, the council will either invalidate the application or refuse it on technical grounds. An invalidated application means you start the clock again from scratch.

The Planning Portal’s application requirements tool lets you check what is required for your specific type of project. Use it early and check your borough’s local validation requirements too, as some councils ask for more than the national minimum.

Tip: Have someone who was not involved in preparing the application review all the documents before submission. Fresh eyes catch things that get missed when you are too close to the work.

7. Impact on Parking and Traffic

In parts of London with serious parking pressure, adding a new dwelling or significantly increasing the size of a property can be refused on highways grounds. Councils will ask whether your development will generate additional car trips that the local road network cannot absorb, or whether the loss of on street parking spaces makes an already stretched situation worse.

This matters most for larger developments, conversions from single to multiple units, and sites close to busy junctions or on narrow residential streets. For straightforward house extensions it is rarely the primary issue, but it can still be a contributing factor alongside others.

If your project involves a new build or a significant change of use, a transport statement may be required. This sets out the anticipated traffic movements and demonstrates that the development will not have an unacceptable impact on the surrounding road network.

8. Sustainability Requirements Are Not Addressed

This is becoming a more significant issue as London moves toward its climate commitments. The National Planning Policy Framework requires new developments to demonstrate a commitment to energy efficiency and low carbon design. The London Plan goes further, with specific requirements around carbon reduction, overheating assessments, and urban greening.

Applications that do not address these requirements, or that propose designs with poor energy performance, are increasingly likely to be refused or asked to provide additional information before a decision can be made.

Practically speaking, this means your application should include an energy statement for most new builds, and it should be designed to meet or exceed the Future Homes Standard which came into full effect in 2026. Heat pumps, high levels of insulation, solar panels, and good airtightness are not optional extras anymore. They are part of what planners expect to see.

Tip: Get an energy consultant involved early. Their input shapes the design from the start rather than being bolted on at the end, which saves money and makes the application much stronger.

9. Neighbour Objections That Raise Valid Planning Points

Neighbour objections cannot on their own cause a planning refusal. A planning officer cannot reject your application simply because the people next door do not like the idea. But objections that raise legitimate planning concerns, loss of light, overlooking, impact on character, noise, they do carry weight.

In practice, a single objection rarely changes an outcome. But multiple objections all raising the same issue can shift a case from officer delegated decision to planning committee, where the dynamics are different and outcomes are less predictable.

The most effective thing you can do is talk to your neighbours before you submit. Show them the plans. Answer their questions. Give them a chance to raise concerns that you can address in the design before you go to the council. Most people are reasonable when they feel listened to. The ones who feel blindsided are the ones who write the strongly worded letters.

Tip: A simple letter to adjacent neighbours explaining your plans, with an offer to discuss, costs nothing and can prevent objections that might otherwise have complicated your application.

10. The Principle of Development Is Not Accepted

Sometimes the problem is not with the details of the design but with the fundamental question of whether any development should happen at all. This is what planners mean when they talk about the principle of development.

This comes up most often when a site is in a location where new residential development is not supported by policy. Green Belt land is the clearest example. Building on Green Belt requires what the National Planning Policy Framework calls very special circumstances, a high bar that most applications cannot meet.

In London, the equivalent constraints include Metropolitan Open Land, sites within flood zones without appropriate mitigation, and sites that conflict with strategic planning designations in the London Plan. If your site has any of these characteristics, the issue of principle needs to be resolved before you invest heavily in detailed design.

A pre-application meeting with the council is the fastest way to establish whether the principle of development is accepted on your site. Many boroughs also offer planning officer duty services where you can ask an initial question. The Planning Advisory Service has guidance on how to make the most of pre-application discussions.

What to Do If Your Application Has Been Refused

A refusal is not necessarily the end of the road. Here is what your options look like.

Review the refusal notice carefully

The council must give written reasons for refusal, citing specific planning policies. Read them. Every point that was raised needs to be addressed if you want to resubmit or appeal.

Resubmit with changes

If the issues are fixable through redesign, you can submit a revised application within 12 months of the refusal at no additional fee. This is often the quickest route to approval if the problems are primarily about design rather than principle.

Appeal to the Planning Inspectorate

If you believe the council got the decision wrong, you can appeal to the Planning Inspectorate. Around 30% of householder appeals succeed. The process takes several months and is worth considering if redesigning would compromise the project significantly or if you have a strong policy case.

Seek pre-application advice before trying again

If the refusal raised concerns you did not anticipate, go back to the council for pre-application advice before spending more on design. Find out exactly what they would accept before you commit to another round of drawings.

Thinking About a New Build in London?

We work across all 33 London boroughs and understand how planning works in each of them. Before you submit anything, it pays to have a conversation with people who have been through this process hundreds of times. Get in touch with our team and we will give you an honest view of what your project is likely to face.

DEVELOPER NOTES

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External links: Planning Portal, Planning Inspectorate (gov.uk), Urbanist Architecture 45 degree guide, NPPF (gov.uk), Planning Advisory Service

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Suggested meta description: Planning permission gets refused in London more often than most people expect. This guide covers the 10 most common reasons and what you can do to avoid them.

Frequently Asked Questions

Can a neighbour stop my planning application in London?

No. Neighbours can object, and their objections are considered as part of the process, but they cannot veto a planning decision. A council can only refuse an application on planning grounds, not because neighbours dislike the idea. That said, objections that raise valid planning concerns do carry weight, so it is worth talking to neighbours before you submit.

How long do I have to appeal a planning refusal?

For householder applications you have 12 weeks from the date of the refusal notice to submit an appeal to the Planning Inspectorate. Missing this deadline means you lose the right to appeal and would need to resubmit a new application instead.

Can I resubmit a planning application after a refusal?

Yes. You can resubmit a revised application within 12 months of a refusal at no additional fee. This is usually the best route if the issues raised are about design rather than whether development is acceptable in principle.

What is pre-application advice and is it worth it?

Pre-application advice is a paid service offered by most London boroughs where a planning officer reviews your proposals before you submit a formal application. It costs between £100 and several hundred pounds depending on the council and the scale of the project. It is almost always worth it. You find out early if there are fundamental issues, which saves far more in wasted design fees and abortive applications. The Planning Portal has details on how to access pre-application advice in your area.

Does planning permission automatically get refused if neighbours object?

No. Objections are a material consideration but they are not decisive on their own. What matters is whether the objections raise legitimate planning concerns. Loss of light, overlooking, and impact on character are valid. Loss of a private view, impact on property values, and dislike of the applicant are not, and cannot be used as grounds for refusal.

How long does a planning application take in London?

Most householder applications should receive a decision within 8 weeks. Major applications take 13 weeks. In practice, many London boroughs take longer due to workload, and complex applications can take considerably more time if additional information is requested. Factor this into your project timeline from the start.

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So here is the short answer: building a house in London in 2026 costs roughly £2,500 to £4,000 per square metre for construction alone. A typical four bedroom home of around 160m² sits somewhere between £400,000 and £640,000 to build, before you factor in land, professional fees, or finishes.

But the range is wide for a reason. What you are building, where you are building it, and how complex the design is will all pull that number up or down. This guide walks through what is actually driving those costs right now.

What Does It Cost Per Square Metre in London Right Now?

In 2026, construction costs in London run higher than almost anywhere else in the UK. Labour is more expensive, sites are trickier, and materials take longer to get to you.

Here is a rough breakdown by build quality:

Note: These figures cover construction only. Land, planning, architect fees, and finishes are all on top.

For context, building the same house somewhere in the Midlands or the North would likely cost £1,500 to £2,200 per m². London carries a 20 to 40% premium, and that gap is not closing anytime soon.

What Does a Full Build Actually Cost?

Let us put real numbers to it. Here are three common scenarios we see:

3 bedroom house (approx. 100m²)

Construction cost: £250,000 to £400,000

This is the entry point for a London new build. At the lower end, you are working with cost effective materials and a straightforward design. At the upper end, you are adding more rooms, better specification, or dealing with a trickier site.

4 bedroom house (approx. 160m²)

Construction cost: £400,000 to £640,000

This is the most common project type we work on across London boroughs. Two storeys, four bedrooms, open plan ground floor. A well managed project in this range should not throw up many surprises, but you need to budget for them anyway.

Large or bespoke home (200m²+)

Construction cost: £600,000 and above

Anything with a basement, unusual architecture, or a prime London location is going to push well above this. Some of the most complex projects we have seen have run to £1m and above in construction costs before any land or fees.

What Else Do You Need to Budget For?

Construction is the biggest line item, but it is not the only one. Here is what most people forget to include:

Good news: VAT is zero rated on new build construction. That saves you 20% on labour and materials compared to renovation work.

What Is Pushing Costs Up in 2026?

A few things are keeping London build costs high right now, and they are worth understanding before you commit to a budget.

• Labour. Skilled tradespeople are in short supply across London. A decent electrician or plumber can charge £350 to £500 per day, and those day rates stack up fast across a full build.
• Materials. Steel, timber, and concrete prices have stabilised after a rough few years, but they have stabilised at a high level. Do not expect them to drop back to where they were.
• Site complexity. London sites often come with access problems, party wall requirements, or difficult soil. Any of these adds time, and time costs money.
• Planning and regulation. The Future Homes Standard is pushing new builds toward better energy performance. That is a good thing, but it adds cost. Better insulation, heat pumps, and specialist glazing all carry a premium.

How Do You Keep Costs Under Control?

There is no magic trick here. But there are a few things that genuinely make a difference.

• Get your design right before you start. Changes during a build are expensive. Spending more time and money on detailed drawings upfront saves far more later.
• Get multiple quotes. Prices vary between contractors, sometimes by 20 to 30% for the same scope of work. Do not just go with the cheapest. Go with the one you trust and whose previous work stacks up.
• Keep the design simple where it does not matter. Unusual roof shapes, cantilevers, and bespoke structural details all add cost. Save the complexity for the things that make a real difference to how you live in the space.
• Hold a contingency. A 10 to 15% buffer is not pessimism. It is just how building works. Something always comes up.
• Choose an experienced contractor. An experienced team will flag problems before they happen, not after.

Is It Worth Building vs. Buying in London?

It depends on what you are comparing it to.

Building gives you a home designed exactly the way you want it, often with better energy efficiency and lower running costs than an older property. You also avoid stamp duty on the construction cost itself, which on a £600,000 and above project is a significant saving.

But building takes time. From first conversation to moving in, you are typically looking at two to four years. And the process requires more involvement from you than just buying a finished home.

For most of our clients, the decision comes down to one thing: can you find an existing property that does what you need, where you want to live, for a reasonable price? If the answer is no, which it often is in London, then building starts to make a lot of sense.

Ready to Talk About Your Project?

We build homes across all 33 London boroughs. If you are thinking about a new build and want honest advice on what it is likely to cost and what to watch out for, we are happy to have that conversation.

Get in touch and we will give you a no pressure conversation about your project.

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FAQ

How long does it take to build a house in London?

From planning permission to completion, most builds take 18 months to three years. Simpler projects on clear sites move faster. Complex designs or difficult planning situations take longer.

Do I need planning permission to build a new house in London?

Yes. All new dwellings require full planning permission. The process typically takes 8 to 13 weeks for a standard application, but pre application advice from your local borough can speed things up significantly.

Is VAT charged on new build construction?

No. New build construction is zero rated for VAT. You will not pay 20% on labour or materials as you would with renovation work. Consultant fees such as architects and engineers do still carry VAT.

Can I build cheaper by managing the project myself?

In theory, yes. You save the 5% project management fee. In practice, self managing a London build is a full time job, and mistakes made without professional oversight often cost more than the saving. Most clients who try it and struggle end up bringing in a professional anyway, at which point it costs more to fix than it would have done to get it right from the start.

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But here’s the thing — it doesn’t have to be that way. With the right preparation and the right people around you, getting planning permission for a new build in London is a process you can navigate. We’ve done it across all 33 boroughs, and we’ve seen firsthand what makes applications succeed and what makes them fail.

This guide is written for you — the homeowner or developer trying to make sense of it all — not for planners or architects who already know the rules.

So What Actually Is Planning Permission?

In simple terms, planning permission is the formal go-ahead from your local council to build something new or significantly change what’s already there.

Its job isn’t to make your life difficult. It exists to make sure new buildings fit in with the neighbourhood around them, don’t cause problems for nearby residents, and meet the environmental and design standards your borough has set.

For almost any new build home in London — whether you’re replacing an old property, developing a plot, or building from the ground up — you’ll need it. There are very limited circumstances where you wouldn’t, and a full new dwelling isn’t usually one of them.

If you’re in a conservation area or near a listed building, you can expect additional scrutiny beyond the standard process. It’s not impossible — but it does require more careful preparation.

Does Every New Build Need Planning Permission?

The short answer is yes, in almost every case.

You’ll need to apply if you’re:

• Building a brand-new home on a plot of land
• Demolishing an existing house to replace it with a new one
• Splitting a plot to create an additional home
• Changing the use of land to residential

Even a straightforward replacement — knocking down one house and building another of similar size — still requires a full planning application. Don’t assume that because you’re not increasing the footprint or height, you can skip the process.

Why London Is Different From Everywhere Else

London isn’t one planning authority — it’s 33 of them.

Each borough has its own Local Plan, design expectations, and priorities for housing development. What sails through in one borough can be refused in the next, even if the two streets are practically side by side.

Some boroughs are actively trying to increase housing supply and are more receptive to new residential development. Others are focused on protecting neighbourhood character and will push back hard on anything that feels out of place.

What this means for you: the borough where your site sits matters enormously. Before you get architects involved or spend money on drawings, it’s worth understanding your specific borough’s planning stance.

A few things that vary significantly across London:

• How strictly are design and materials controlled
• Conservation area boundaries and what they restrict
• Parking requirements and how they’re assessed
• Attitudes to building height and density
• How much weight is given to neighbouring objections

This is one of the reasons local experience counts for a lot. Knowing what a specific council has and hasn’t approved recently is genuinely useful — and it’s knowledge that only comes from working there.

What the Planning Process Actually Looks Like

Here’s a realistic picture of what happens from the point you have a site to the point you have permission.

1. Work Out What’s Feasible

Before any drawings are produced, a good architect or planning consultant will look at your site and tell you what type of development is likely to get through. This means reviewing planning history, checking local policy and identifying any constraints — conservation areas, listed buildings, and existing planning conditions.

This stage saves money. It’s far cheaper to adjust your ambitions now than after you’ve paid for detailed drawings.

2. Develop the Design

Once you have a clear picture of what’s achievable, the architect produces the drawings — floor plans, elevations, site layout, street views. A design and access statement is also prepared, which explains the design’s rationale and why it’s appropriate for the site.

The aim here is simple: show the council that the proposed building is the right building for that location.

3. Submit the Application

The full application goes to the borough council along with the drawings, planning statement, any required supporting reports, and the application fee.

Fees vary by project scale. For a new dwelling, you’re typically looking at several hundred pounds — but this is a small part of the overall cost and not where to cut corners.

4. Public Consultation

Once the application is validated, the council notifies neighbours and invites feedback. This is standard and doesn’t mean your application is in trouble — but it does mean a poorly designed or inconsiderate scheme is more likely to attract objections that influence the outcome.

5. The Decision

Most local authorities aim to decide within 8 to 13 weeks. Complex applications or those that attract significant objections can take longer.

The possible outcomes are approval, approval with conditions, or refusal. If it’s refused, you can revise and resubmit or appeal — but both take time and money. Getting the application right the first time is always better.

What Gets Applications Into Trouble

Having worked through planning across dozens of London new build projects, we see the same issues come up repeatedly.

Impact on the neighbours

Councils take this seriously. If your proposed building overshadows an adjacent garden, looks directly into a neighbour’s bedroom, or blocks daylight from a nearby property, you’ll likely be asked to change it. This isn’t unusual — it’s part of the process — but it’s far less disruptive if you design with it in mind from the start.

Not fitting the street

‘Complementing the surroundings’ doesn’t mean copying what’s already there. But the scale, materials, and proportions of your new build need to feel like they belong on that street. Contemporary designs can get through — but they need to be well-argued and well-designed.

Inadequate access or parking

In areas with controlled parking zones, new developments need to demonstrate they won’t make an already difficult situation worse. This is a specific London challenge that catches out developers who haven’t worked here before.

Thin sustainability credentials

London planning policy increasingly expects new builds to show strong environmental performance — energy efficiency, sustainable materials, and so on. This isn’t something to bolt on at the end. It needs to be considered in the design from day one.

How to Give Your Application the Best Chance

• Use professionals with genuine local experience — not just London experience generally, but experience in your specific borough. What’s worked in Hackney won’t necessarily work in Richmond.
• Look at what’s been approved nearby. Planning portals are public. Searching similar applications in your area gives you a real picture of what the council has said yes to — and what it hasn’t.
• Consider pre-application advice. Many boroughs offer a paid consultation with a planning officer before you submit. It costs money upfront but can save significant time and redesign costs later.
• Design for the neighbours, not just for yourself. A scheme that makes clear effort to minimise impact on adjacent properties is far more likely to get through — and far less likely to generate objections that slow everything down.
• Don’t rush the submission. A well-prepared application that answers the council’s likely questions before they ask them is always better than a fast one that leaves gaps.

What Happens Once You Have Permission

Planning permission is the green light — but it’s not the finish line. Once it’s granted, the project moves into the next phase: building regulations approval, structural design, construction drawings, and contractor appointment.

This transition matters. The quality of your construction planning at this stage determines whether the project runs smoothly or starts racking up costs and delays. It’s worth making sure whoever takes on the build has sight of the planning conditions from the start — some conditions have to be discharged before construction begins, and missing them creates problems later.

The Honest Summary

Planning permission feels like an obstacle. And sometimes it is slow, frustrating, and unpredictable.

But most of the time, the applications that fail are the ones that weren’t prepared well enough, didn’t take local policy seriously, or underestimated the impact on neighbours.

The ones that succeed are the ones where someone did the groundwork properly — reviewed the borough’s stance, designed a building that could justify itself, and submitted an application that answered the obvious questions upfront.

It’s not a lottery. It’s a process. And like most processes, it goes a lot better when you know what you’re doing.

At New Build Contractors, we work alongside architects and planners on new build projects across London from the earliest stages. If you’re trying to work out what’s possible on your site — or just want a realistic sense of what the planning process looks like for your specific project — we’re happy to talk it through.

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