Chimney Breast Removal Cost London 2026 | Price Guide

Removing a chimney breast in London costs between £1,500 and £5,000 for a typical single-floor or part removal, rising to £3,000–£7,000 for taking out a full stack from ground floor to roof. The price depends on how much masonry comes out, the structural support needed and whether a party wall is involved. This guide breaks down the costs by scope and explains exactly what your money pays for, so you can budget accurately before booking a free survey.

How much does chimney breast removal cost in London?

A chimney breast removal in London typically costs £1,500–£5,000, and a full stack removal from ground floor through the roof runs £3,000–£7,000. The single biggest variable is how much of the chimney you take out: removing the breast in one room is a contained job, while removing the whole stack across every floor is effectively a small structural project. Labour sits around £150–£350 per day for the builders and bricklayers involved, and most jobs run two to five days. On top of labour you are paying for a structural engineer, building control, the steel or brackets that carry the masonry above, skip hire and making good. London adds 25–40% over national averages, driven by higher day rates, parking suspensions, restricted access in terraces and the cost of carrying spoil out by hand. The table below shows the ranges we see by scope across our London projects. Figures exclude VAT, which we set out separately in any written quote.

Scope of removal	Typical London cost (2026)
Ground-floor breast only (chimney above retained)	£1,500 – £3,000
Breast through two floors	£2,500 – £4,500
Full height, breast removed on every floor	£3,500 – £5,000
Whole stack removed including roof and chimney	£3,000 – £7,000

Why you cannot just knock a chimney breast out

A chimney breast is load-bearing in two directions. It carries the weight of the masonry stack above it, and in many London terraces it also supports floor joists and the breasts on the floors above. Remove the bottom section without supporting what sits above, and you create a serious collapse risk. That is why a chimney breast removal is never just demolition. Where the breast above is being retained, the masonry it leaves behind must be carried on a steel beam or a pair of gallows brackets bolted into the party wall. The correct solution depends on weights, spans and the condition of the surrounding brickwork, which is precisely what a structural engineer is paid to calculate. We will not start a chimney breast job without engineer's calculations and building control sign-off in place. It protects your home, your neighbour's home and the value of your property at resale, when a surveyor will ask to see exactly this paperwork.

Gallows brackets vs RSJ: which support do you need?

There are two common ways to support the masonry left above a removed chimney breast, and the choice is the engineer's, not the builder's. Gallows brackets are steel angle brackets bolted into the party wall to cantilever the load. They are cheaper and quicker, with no need to cut into the wall for bearings, but they are only permitted when the wall is sound solid brickwork of adequate thickness and the load above is modest. Many building control departments now require an engineer to specifically approve bracket use. An RSJ, or rolled steel joist, is a beam built into the wall on padstones to carry the masonry above. It is stronger and suits heavier loads, larger openings or weaker walls, but it is more labour-intensive because bearings must be cut, propped and made good. An RSJ adds roughly £300–£900 to a job over brackets, depending on size and access. We price whichever solution the engineer specifies. If a quote omits the support method entirely, that is a warning sign.

Party wall agreements and your neighbours

Most London chimney breasts sit on a shared party wall, which brings the Party Wall etc. Act 1996 into play. If your works affect the structure of a wall you share with a neighbour, and removing a chimney breast or fixing gallows brackets into it usually does, you must serve notice on the adjoining owner before work starts. If your neighbour consents in writing, the matter is settled quickly and cheaply. If they dissent, or do not respond, surveyors are appointed to agree a party wall award, and you typically pay fees of £1,000–£2,000 per adjoining owner. In a terrace, the breast may abut two neighbours, so budget accordingly. Serving notice properly takes time, often a couple of months, so this is the part of the job to start early. We flag party wall implications at the survey stage so there are no surprises, and we are happy to coordinate with your surveyor.

Making good: the cost people forget

The demolition is only half the job. Once the breast is out and the steel or brackets are in, the space has to be returned to a finished room, and making good is where budgets quietly drift if it is not priced from the start. Making good covers infilling the floor where the hearth was, patching or rebuilding the wall, fitting new skirting and architrave, plastering the affected walls and ceiling, and redecorating. Where a breast is removed on an upper floor, the floor above also needs the void closed and the boards relaid. On a typical job, making good adds £600–£1,800 depending on how much plastering, carpentry and decoration is needed. We price chimney breast removals to include making good back to a paint-ready or fully decorated finish, because a half-finished hole in a room is not a completed job. We will tell you exactly which finishes are included in your written quote.

Building control and certification

Chimney breast removal is structural work, so it is notifiable to building control. You can use either your local authority building control or an approved inspector, and the application fee in London typically runs £300–£700 depending on the borough and the route. Building control reviews the engineer's calculations, inspects the steelwork or brackets before they are covered up, and issues a completion certificate at the end. That certificate matters: when you sell, the buyer's solicitor and surveyor will ask for proof that any chimney breast removal was done with proper consent and support. Undocumented removals, which are depressingly common in older London homes, can stall a sale or knock thousands off the price. We handle the building control notification and arrange inspections as part of the works, and we hand over the completion certificate on finishing so your paperwork is clean.

How to get an accurate chimney breast removal quote

A reliable quote starts with a site visit, because the cost is driven by access, masonry condition and structure, none of which can be judged from a photo. A builder quoting a firm price over the phone is guessing, and that guess becomes a provisional sum that grows later. A proper quote will name the support method the engineer has specified, set out who arranges the structural calculations and building control notification, address any party wall implications, and state clearly what making good is included. It should separate VAT and list the day rate and likely duration. At London Refurbishments & Leak Repairs we provide a free survey and a fixed written quote covering all of the above. We coordinate the structural engineer, manage building control, advise on party wall steps and finish the room properly, so you get one accountable price rather than a string of unexpected extras.

Frequently Asked Questions

How much does it cost to remove a chimney breast in London?

Removing a single chimney breast in London costs £1,500–£5,000 in 2026, depending on how many floors are affected and the support needed. Removing the entire stack from ground floor through the roof costs £3,000–£7,000. These figures cover labour, structural support and making good but exclude VAT and party wall surveyor fees.

Do I need a structural engineer to remove a chimney breast?

Yes. A chimney breast is load-bearing, so a structural engineer must calculate the support, whether gallows brackets or an RSJ, before any masonry is removed. Engineer's fees typically run £400–£900, and building control will require these calculations before signing off the work.

Do I need a party wall agreement to remove a chimney breast?

Usually yes. Most London chimney breasts sit on a shared party wall, so the Party Wall etc. Act 1996 applies and you must serve notice on the affected neighbour before starting. If they dissent, surveyor fees run £1,000–£2,000 per adjoining owner, so allow extra time and budget in a terrace.

How long does chimney breast removal take?

A single-floor chimney breast removal usually takes two to three days, while a full-height or whole-stack removal can run four to five days plus making good. Allow additional lead time for engineer's calculations, building control notification and any party wall procedures before work begins.

Can you remove a chimney breast and leave the one above?

Yes, this is common, but the masonry left above must be supported on gallows brackets or a steel beam designed by a structural engineer. Leaving an upper breast unsupported is dangerous and will fail a building control inspection. We price the correct support method into every quote.

Chimney Breast Removal Cost in London: 2026 Price Guide