Chimney Breast Removal: What Is Involved

Why the stack above matters

A chimney breast is the projecting part of the chimney inside a room. It carries the weight of the flues and the stack above it, often all the way to the roof. Take out the lower section without support and that weight has nothing to sit on.

There are two broad approaches. The whole chimney can come out from ground floor to roof, which removes the problem entirely but means roof and loft work. Or only the lower breast is removed and the remaining masonry is carried on steel gallows brackets fixed into sound brickwork, or on a steel beam spanning between walls. Which one is appropriate depends on the wall, the loads and the age of the house.

Rules and paperwork

Removing a chimney breast counts as structural alteration under the Building Regulations, so building control must approve or inspect the work. Most councils and approved inspectors expect calculations from a structural engineer showing how the remaining masonry is supported.

In a semi-detached or terraced house the chimney is often on, or shared with, the party wall. Cutting into a party wall normally requires notice to the neighbour under the Party Wall etc. Act 1996, and that notice period needs to be built into the programme. Listed buildings need listed building consent for this kind of change.

Structural engineer's design for the support · Building control approval and completion sign-off · Party wall notice where the chimney sits on a shared wall · Listed building consent where relevant · Check whether any flue is still in use, including a neighbour's

The work on site, step by step

The room is cleared and sealed off with dust sheeting, because demolishing brickwork inside a lived-in house produces a lot of dust. Temporary props go in before any structural masonry is cut.

The support is installed first: gallows brackets are fixed into the wall or a beam is set into padstones. The breast is then taken down course by course and removed from site. After that the floor is made good where the hearth was, the wall is plastered, and the room is ready for decoration. Building control inspects at the agreed stages.

What affects the price

The published range covers most straightforward removals with gallows or beam support. Where a job moves towards the upper end or beyond, it is usually because of one of the factors below.

Removing breasts on more than one floor · Taking the stack down through the roof · A shared chimney needing party wall work · The condition of the surrounding brickwork · The extent of plastering and floor repairs afterwards

Work that shapes a chimney breast removal quote. Item | Main cost factors | Programme effect. Removal and permanent support — Floors affected, masonry weight and support design — Main site phase; Structural engineer's calculations — Survey, load path and complexity — Completed before structural work; Building control — Application route and inspection stages — Runs alongside the work Party wall work, roof repairs, plastering, flooring and decoration can be separate parts of the scope.

Is it worth doing?

In a small room, taking out a breast can recover enough space for a fitted kitchen run, a wardrobe wall or a better furniture layout. It also often forms part of a wider knock-through or kitchen refit, where the structural alterations are done together to save repeated disruption.

Buyers and their surveyors will ask for the building control completion certificate, so it is worth keeping the engineer's design and sign-off with the house deeds.

Frequently asked questions

Do I need planning permission to remove a chimney breast?

Usually not for internal removal on an unlisted house, but it does need building control approval as structural work, and listed buildings need consent. Removing the stack above the roof can affect appearance, so check if the house is in a conservation area.

How long does chimney breast removal take?

The structural price table lists around one week on site for a removal with gallows or beam support. Engineer's calculations and any party wall notice need to be arranged before that.

Can I remove a chimney breast on one floor only?

Yes, as long as the masonry above is properly supported on gallows brackets or a beam designed by an engineer, and building control signs it off.

Do I need to tell my neighbour?

If the chimney is on or shares a party wall, a party wall notice is normally required before work starts.