Do You Need Planning Permission for Demolition in London?

Most people assume demolition is straightforward. You hire someone, they knock it down, job done. But in London, it's rarely that simple. Planning rules exist, and getting them wrong can cause real problems.

So let's go through what actually applies and when.

The short answer

For most demolition work, you don't need full planning permission. But you do need to notify the council, and in some cases you need their approval before anything starts. There's a difference between the two, and it matters.

Prior approval, not planning permission

When people say "you need permission to demolish," they usually mean prior approval. This is a specific process under permitted development rights. You apply to your local authority, they review it, and they either approve it, ask for conditions, or refuse.

Prior approval is required when you're demolishing a building that has a cubic content of more than 50 cubic metres, or when it fronts a highway, waterway, or public open space. In practice, this covers most houses and commercial buildings.

You submit a prior approval application, and the council has 28 days to respond. If they don't respond in time, you can proceed. If they do respond and approve it, you can proceed. If they refuse, you can't.

When you do need full planning permission

There are situations where demolition does require a formal planning application. The main ones are:

If the building is listed, even partial demolition requires listed building consent. This is separate from planning permission and treated very seriously. Carrying out works without it is a criminal offence.

If you're in a conservation area, the rules tighten. Demolishing a building over a certain size in a conservation area requires prior approval at minimum, and in many cases the council will want full details of what's replacing it before they agree to anything coming down.

If your demolition is part of a wider development, for example knocking a house down to build flats, the demolition is usually assessed as part of the overall planning application. You wouldn't apply separately.

What doesn't need any application

Smaller structures are generally exempt. Demolishing a greenhouse, a garden shed, or a small outbuilding that isn't attached to the main house typically doesn't need prior approval or planning permission.

Gates, fences, and walls under a certain height are usually fine too. The thresholds are set out in permitted development rules, and your local planning department can confirm if you're unsure.

The party wall question

Planning permission and party wall agreements are two different things, but people mix them up. A party wall agreement is a legal notice you serve on neighbours when demolition or construction affects a shared wall or structure. It's not a planning matter. You can have planning permission and still need a separate party wall agreement. In London, where properties are closely packed, this comes up on almost every job.

Conservation areas in London

London has hundreds of conservation areas. If you're not sure whether your property sits in one, check with your local borough or use the planning map on the council's website. Most publish them online.

Working in a conservation area doesn't automatically block demolition, but it does mean more scrutiny. The council will want to know what's going in its place. Demolishing a Victorian terrace and leaving a gap site won't get approved easily.

What happens if you get it wrong

Demolishing without the right permissions isn't just a paperwork issue. The council can issue an enforcement notice requiring you to rebuild what was there before. In cases involving listed buildings, there's also the risk of prosecution. These aren't common outcomes, but they do happen, and the costs involved are significant.

It's always worth a quick call to the planning department before you start. Most councils will give you an informal steer without charging for it.

Permitted development changes

Planning rules do change. The government has amended permitted development rights several times in recent years, and local authorities can also add their own restrictions through Article 4 directions. An Article 4 direction removes certain permitted development rights in a specific area. Some London boroughs use these extensively, particularly in housing areas with strong architectural character.

If your property is in an Article 4 area, work that would normally fall under permitted development might need a full planning application instead. Again, check with the council before assuming you're covered.

Practical steps before you demolish

Find out if the building is listed. The Historic England website has a searchable register.

Check if you're in a conservation area. Your local council's planning portal will show this.

Contact the planning department and describe what you want to do. Ask directly whether prior approval is needed.

If prior approval is required, submit the application before booking any contractor. The 28 day window runs from when the application is validated, not when you submit it.

Get everything in writing. A phone call with a planning officer is useful, but a written decision or letter is what protects you.

The bottom line

You probably don't need full planning permission for a straightforward demolition in London. But you very likely need prior approval, and if your building is listed or sits in a conservation area, the process is more involved. Skipping the checks to save a few weeks can turn a simple job into a long and expensive headache.

A five minute check at the start saves a lot of trouble later.

Frequently Asked Questions

Do I need planning permission to knock down a garden wall?

Usually not. Garden walls under one metre high that border a highway, or under two metres elsewhere, fall within permitted development. If you're in a conservation area, check with your council first as local rules can differ.

How long does prior approval take?

The council has 28 days to respond once your application is validated. In practice, some councils are quicker, some take the full period. Build this into your timeline before booking contractors.

Can I demolish a building and leave the site empty?

Technically yes, but in conservation areas the council will often want to know what's replacing it before approving demolition. Leaving a gap site in a sensitive area is unlikely to get a straightforward sign off.

What is an Article 4 direction and how do I know if it applies to me?

An Article 4 direction removes certain permitted development rights in a specific area. Your local council's planning portal will show if one applies to your property. When in doubt, call the planning department and ask directly.

Is demolishing a listed building ever allowed?

Rarely, and only with listed building consent. Even partial demolition of a listed structure requires consent. Doing it without permission is a criminal offence, not just a planning violation.

Do I need permission to knock down an internal wall?

Internal walls are generally not a planning matter. But if the wall is load bearing, you'll need structural sign off and may need building regulations approval. Listed buildings are different again. Any internal work on a listed property can require consent.

What if my council doesn't respond within 28 days?

If no decision is issued within 28 days of the application being validated, you can legally proceed. Keep written evidence of the submission date and the lack of response. Don't rely on a verbal conversation.

Can my neighbour block my demolition?

A neighbour can object during a planning or prior approval process, and the council will take objections into account. But they can't veto it outright. If there's a party wall involved, they do have rights under the Party Wall Act, which is separate from planning altogether.

What's the difference between listed building consent and planning permission?

They're two separate things. Planning permission covers what you build or demolish in terms of land use and appearance. Listed building consent specifically protects the character of a building with historical or architectural significance. You may need both, or just one, depending on what you're doing.

How do I find out if my building is listed?

Search the Historic England National Heritage List at historicengland.org.uk. You can search by address. Your local council's planning portal will also flag it if your property has any listing or local designation.