How do you obtain planning permission, and what are permitted development rights?
If you're planning to build or extend your home, you're likely to have come across two confusing terms — planning permission and permitted development rights.
Though they sound similar, significant differences can be made in your project by them. The project will be affected by each of them in terms of what you can build, how long it takes, and the level of freedom you have in designing.
We advise homeowners on these matters at New Build Contractors on a daily basis. If you understand the two ways to build a glass kitchen extension, loft conversion, or a new build home, you will save time, hassle, and cost overruns.
What is the Difference Between Planning and Permitted Development?
Planning Permission is a legal document from your local council which permits you to carry out new building works or make major changes. If your project involves modifying the building structure of your property, this may apply to your project.
On the other hand, PD or Permitted Development Rights are national rules that allow you to make minor changes without the need for a planning application. These rights were brought in to help homeowners make improvements to their homes, as long as the work is not too extensive.
In simple terms.
Having planning permission allows you to build what you want on the site you choose.
Permitted, a building will let you know upfront, but with limitations.
When You Can Build Under Permitted Development.
Many common home improvements are covered under permitted development.
-
Single-storey rear extensions up to 3 m on terraced or semi-detached homes, and 4 m on detached homes
-
Two-storey extensions set back at least 7 m from the rear boundary
-
Loft conversions adding up to 40–50 m² of extra space (depending on house type)
-
Garage or outbuilding conversions within the original footprint of your home
Nevertheless, your structure must still meet the design criteria (similar materials, no raised terraces, no front-facing dormers).
If your property is listed in a conservation area or in an Area of Outstanding Natural Beauty, your PD rights will be curtailed or may not apply at all.
It is always advisable to verify your eligibility before commencing work.
When Planning Permission Is Required.
If you exceed those limits ,you will need full planning permission.
Typical examples include.
Large or double-storey extensions that exceed PD limits.
Complete new builds or replacement dwellings.
Major structural alterations.
Homes in conservation or heritage zones.
Buildings that have materials that contrast with the neighbouring buildings.
Planning permission is the way to go for most new-build homes or bespoke extensions. It provides design liberty, flexibility with materials, and the ability to create something unique that PMD rules do not always allow.
Which Option Is Right for You?
The right choice depends on your goals.
If you want to add valuable space fast – perhaps a kitchen extension or small loft conversion – permitted development could be for you.
More elaborate designs or custom designs, such as those with high ceilings, large glazing, or a different shape, will usually require planning permission but can often be worth the wait.
Here's how to think of it: with permitted development, you are thinking convenience; with planning permission, you are thinking creativity.
Common Mistakes to Avoid.
Many property owners think they have PD rights because “the neighbours did it.” But each property has different planning rights, boundaries, and local restrictions.
The safest approach is to check first.
Check with your architect or builder to confirm your PD eligibility.
Get LDC to confirm that your proposals are lawful and meet the PD criteria.
Keep accurate details of drawings, measurements and materials used.
We often see costly redesigns or enforcement notices if this functionality is not incorporated - a constant feature in London.
How New Build Contractors Can Help.
We employ the services of experienced architects and planning consultants with a clear understanding of local planning policies across Greater London, Surrey and the Home Counties.
Here’s how we guide clients.
Before undertaking any design work, a site assessment takes place to examine feasibility and local restrictions.
Architectural design draws up drawings that are within the limits of PD or planning policy.
Preparing the required paperwork and dealing with the local authority regarding planning applications.
Making Sure That Construction Meets Building Regulations and Planning Conditions
We manage the entire process, so your priorities can be on design and outcome — not paperwork.
7. A Quick Example.
A homeowner in Kingston contacted us to extend their detached home by 5 metres to create an open-plan kitchen/dining space.
Under permitted development, the limit was 4 metres.
We assisted in preparing a comprehensive planning application, which included a design statement. They got approved to build an additional metre onto the building, complete with bigger glazing and a seamless link into the garden.
That one extra metre made all the difference.
Final Thoughts.
If you want to build not just legally, but smartly, knowing planning permission and permitted development is a must.
Smaller projects can benefit from the speed and simplicity of permitted development.
Planning permission can provide flexibility, creativity, and long-term value.
At New Build Contractors, we take care of both — we ensure your new build or extension is designed, approved, and built legally and efficiently to a high standard.
If you’re ready to get in the game, our team can help assess your property and advise on the best route for you.
Contact us to discuss your project or receive a complimentary consultation.
