Planning · Hampstead
Do I Need Planning Permission for a House Extension in Hampstead?
Whether a Hampstead extension needs planning permission depends on the property. This guide explains permitted development, why Hampstead is often more sensitive, and what to check.
The short answer
It depends on the property. Some house extensions in London may be possible under permitted development rights without a planning application, but in Hampstead this often cannot be assumed. Much of the area is within conservation areas, many homes are flats or listed, and Article 4 directions can remove permitted development rights. The safest first step is to check your specific property rather than relying on a general rule.
Permitted development overview
Permitted development rights allow certain works to houses to proceed without a full planning application, subject to limits and conditions on size, height, materials and position. These rights apply to houses, not to flats or maisonettes, and they are frequently restricted in sensitive locations. Even where permitted development applies, you may need a lawful development certificate to confirm the works are lawful, and you will still usually need building regulations approval.
Why Hampstead can be more sensitive
Hampstead’s historic character is protected by extensive conservation-area coverage and a significant number of listed buildings. In these contexts, the planning system exercises greater control over change, design quality is assessed closely, and permitted development rights are often reduced or removed. What might be permitted elsewhere can require a full application here.
Conservation areas
In a conservation area, additional controls apply and permitted development rights for extensions and alterations may be restricted. Materials, windows, rooflines and the rear building line are assessed for their effect on the area’s character. Many extensions in Hampstead conservation areas therefore require planning permission and careful, character-led design.
Listed buildings
If your property is listed, listed building consent is required for many alterations, inside and out, in addition to any planning permission. Carrying out unauthorised works to a listed building is a criminal offence, so confirming the building’s status and the consents required is essential before any work.
Flats and maisonettes
Permitted development rights generally do not extend to flats and maisonettes, so extensions and many alterations require planning permission. Leaseholders also usually need freeholder consent through a Licence to Alter. If your Hampstead home is a flat, assume a more involved route and check the position early.
Article 4 directions
An Article 4 direction removes specified permitted development rights in a defined area, meaning works that would otherwise be permitted require a planning application. Parts of Hampstead are subject to such directions, so even a house that would ordinarily benefit from permitted development may not. This should be checked for the specific address.
Planning drawings and next steps
If a planning application is needed, you will require planning drawings and, depending on the proposal, supporting statements. If permitted development may apply, a lawful development certificate can confirm it. Either way, building regulations drawings will be needed to build. Send us your address and proposal and we will advise the likely route for your property.
Frequently asked questions
Can I extend my Hampstead house without planning permission?
How do I find out if I am in a conservation area?
Explore further
Related services and areas
Need drawings or planning advice for your property?
Tell us the property address, type and what you are considering. We will advise the likely route — planning, building regulations, or both — and what information will be needed.