Can I knock down an internal wall without approval?

Usually no planning permission is needed, but Building Regulations often apply, especially for load-bearing walls — always check first.

KR-01The short answerIt depends. Removing a non-loadbearing wall usually needs no planning permission and often no Building Regulations approval, unless it affects fire escape routes, ventilation or services. If the wall is loadbearing, holding up the floor or roof above, you will need Building Regulations approval. Skipping that check is the main risk, not planning.

KR-02This guide covers England firstThe rules below are written for England. Scotland, Wales and Northern Ireland have their own systems, covered in the last step. If you're not sure which nation's rules apply to your property, start with the Planning Portal for England and Wales, or mygov.scot and nidirect for Scotland and Northern Ireland.

KR-03What actually decides the answerThere's no fixed size or percentage limit for internal walls like there is for extensions. The real question is whether the wall is load-bearing, and whether it carries services like gas pipes, electrics or plumbing. A structural engineer or your Building Control body can confirm this from a site visit, not guesswork.

KR-04Listed buildings need consent for internal work tooIf your home is a listed building, removing or altering an internal wall almost always needs listed building consent, even if the wall isn't original or isn't structural. This applies regardless of planning permission or Building Regulations. Check with your council's conservation officer before doing anything.

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Listed building consent is a legal requirement for internal alterations to a listed building, and doing unauthorised work is a criminal offence.

KR-05Flats, maisonettes and leasehold checksKnocking down an internal wall isn't 'development', so it doesn't need planning permission even in a flat. But leases commonly require the freeholder's written consent before you touch any wall, and in a block of flats a wall may also hold up the flat above or form a fire separation. Check your lease and ask the freeholder or managing agent first.

KR-06Planning permission and Building Regulations are separateNot needing planning permission does not mean you're free of Building Regulations, and vice versa. For internal wall removal, planning is rarely the issue; Building Regulations compliance usually is, because it covers structural safety, fire safety and ventilation. Treat them as two separate questions you need to answer separately.

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Building work affecting the structure of a house must comply with Building Regulations, independently of any planning permission position.

KR-07Check with the shared wall rule tooYou can't remove a party wall, the wall you share with next door. But if your work cuts into it, for example to rest a steel beam on it, the Party Wall Act applies. You'd need to serve formal notice on your neighbour before starting. A party wall surveyor can confirm whether your wall counts.

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The Party Wall Act 1996 requires written notice before cutting into a party wall, for example to bear a beam on it.

KR-08Who to ask and howUse the Planning Portal's interactive guidance to check planning status for your property type. For Building Regulations, contact your local council's Building Control team or a registered building control approver before work starts; they can advise whether full plans or a building notice is the right route. If there's any doubt about planning status, you can apply for a Lawful Development Certificate as formal proof.

KR-09Realistic costs and timescalesA structural engineer's calculations for a steel beam typically cost a few hundred pounds, often £300 to £800. Building Control fees for this kind of job are commonly a few hundred pounds, depending on your council or approver and the size of the job. If the Party Wall Act applies, a surveyor typically costs roughly £700 to £1,500 or more per surveyor, and you usually pay for your neighbour's too. Get quotes before you commit.

KR-10What happens if you skip itRemoving a load-bearing wall without Building Regulations sign-off can leave your home structurally unsafe, and you may be told to expose the work again or fix it at your own cost. When you sell, conveyancers will ask for a completion certificate, and without one, buyers or their lenders can pull out or demand an indemnity insurance policy. Indemnity insurance only covers the legal risk of enforcement, it does not fix an unsafe wall, so it's a last resort, not a shortcut.

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Councils can take enforcement action for unauthorised building work that breaches Building Regulations, and can require remedial work to be carried out.

KR-11If you live in Wales, Scotland or Northern IrelandWales follows a very similar planning and Building Regulations system to England, but check the Welsh Government and Planning Portal Wales pages, as some rules differ slightly. Scotland has its own permitted development rules and needs a building warrant before you remove a loadbearing wall; non-loadbearing partitions usually don't need one; check mygov.scot before starting. Northern Ireland has its own planning and Building Regulations system entirely separate from Great Britain; check nidirect for the correct process.

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Scotland requires a building warrant from the local authority for most structural work, and Northern Ireland has its own separate planning and building control legislation.

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