Do you need Building Regulations approval to remove a chimney breast?

The chimney breast is the block of masonry that juts into a room from the wall, usually where the fireplace used to be. Once the fire has been boarded over it looks like a bulky ornament. It is nothing of the kind. The Planning Portal is blunt: removing one always brings Building Regulations approval into play, because the breast is built into the structure of the house.

The reason is load. Upstairs the same column often carries on through the bedroom and into the loft, and the brickwork higher up can depend on it for support. Cut away the lower part carelessly and something else has to carry the weight. A structural engineer, or your building control body, decides what that something is, and the calculation is theirs to put their name to. Treat any plan to remove a breast as a structural alteration from the very first conversation with a builder, not as a tidy-up job.

People say chimney removal and mean three different things. The breast is the part inside the rooms. The stack is the part above the roof line, topped with pots. You can take out the breast and keep the stack, take the stack down to below the roof and keep the breast, or clear the lot. Each has its own consent and its own risks, and the quote and the order of trades change with the choice.

The riskiest combination is a stack left standing over a removed breast, because the brickwork above is then held up by new supports in place of the wall it was built on. Taking down a stack alone is a roofing job: the opening is closed with new rafters, battens and tiles or slates to match, and the loft side is made good. Our page on chimney removal covers that roof side. When you first call, tell us which of the three you mean.

Plenty of terraced and semi-detached houses have a breast built into the wall they share with the neighbour. Remove it and you are cutting into a wall that is partly theirs. A party wall notice has to reach the neighbour before the work begins, giving them the chance to agree to it or to appoint a surveyor of their own.

Do not leave the notice until the builder has been booked. If the neighbour does not agree, a formal process has to run before anyone lifts a hammer, and it can add weeks. A stack that straddles the boundary raises the same point from the roof side. From the roof we can tell whether the stack serves your house alone or both, and that goes into the survey photographs. For the legal side of the wall itself, speak to a party wall surveyor or read the GOV.UK party wall guide, because we are roofers and not solicitors.

Approval under the Building Regulations is one thing and planning is another. A listed building is the clearest case. Works that would alter its character as a place of special architectural or historic interest need listed building consent, and chimneys are frequently part of that character. In a conservation area, Arun's own guidance for The Steyne describes chimneys as important skyline features.

Some councils add tighter controls. Portsmouth's Article 4 direction for Old Portsmouth controls the removal or alteration of stacks, while Havant's Langstone direction reaches the demolition of any stack that can be seen from the highway. No direction like that turned up for Arun's Bognor conservation areas, yet councils can change their position, so ask Arun District Council's planning team before planning to remove a stack people can see. Inside the South Downs National Park, ask which authority decides, since it varies by district. If you are unsure whether your street is covered by any of this, say so when you first get in touch and we will say which council officer to ask before the survey.

You or your builder tell the building control body before work starts, describing the alteration and usually attaching an engineer's design for whatever replaces the support. The body inspects at set stages and issues a completion certificate when satisfied. File that certificate with your deeds. A buyer's solicitor will want to see it, and its absence is a classic reason for a sale to stall on a house where a breast has gone.

Where the chimney work reaches the roof, we explain which parts need consent and handle the Building Regulations notification when the work is notifiable. We survey first, photograph the stack, flashings and loft side, and you get one written price. If removal leaves a stack that now looks tired, our chimney repairs page covers what follows, and the guide to planning for chimney removal goes deeper into consent. Keep every certificate, drawing and photograph together in one folder, because the paperwork matters as much as the brickwork when you come to sell.