Finding a plot is the hardest part of building in London. Not the planning. Not the build. The plot.
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.
| What to Check | Why It Matters |
| Planning history | Has anything been refused here before? What were the reasons? This tells you a lot about what the council will and will not accept. |
| Flood risk | Check the Environment Agency flood map. A site in Flood Zone 2 or 3 is not unbuildable but it adds cost, time, and uncertainty. |
| Services and utilities | Is there a gas main, water supply, and sewer connection accessible from the site? If not, how far away are they? |
| Access | Can construction vehicles get to the site? Is there a right of access over neighbouring land if needed? |
| Ground conditions | Is the site on clay? Former industrial use? Near trees? Ground conditions directly affect foundation costs. |
| Ownership and title | Are there any restrictive covenants, rights of way, or third-party interests that affect what can be built? |
| Neighbours | Who surrounds the site and what are they likely to think of a new dwelling? Objections cannot stop you, but they complicate things. |
| Conservation area or listed buildings nearby | These trigger higher design scrutiny and can affect what gets approved. |
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.
| Area | Typical Plot Price Range |
| Outer London (zones 4 to 6) | £150,000 to £400,000 |
| Mid London (zones 2 to 3) | £300,000 to £700,000 |
| Inner London (zone 1 to 2) | £500,000 to £1,500,000+ |
| Prime central London | £1,500,000 and above |
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.
