Chimney Breast Removal Cost UK 2026: Beam vs Gallows Brackets

How much does chimney breast removal cost in the UK?

Removing a chimney breast costs roughly £1,500–£7,500 in 2026. A single-floor removal in one room is around £1,500–£2,500 if it is supported on gallows brackets, or £2,200–£3,250 on a steel beam. Taking the breast out on two floors runs £3,000–£5,000, and removing the whole stack including the roof work is £3,500–£7,000. Only full stack removals in London and the South East reach the top of that band, where scaffolding, roof making good and party wall surveyors push the total well past the builder's own figure. Whichever floor it happens on, this is structural work that needs building regulations approval, so a Building Control fee belongs on the quote.

Quick cost summary

Ranges reflect UK trade pricing and MyBuildAlly quote analysis in 2026. Regional variation is wide: London and the South East sit at the top of every band, and the North and Midlands at the bottom. Scaffolding cost depends on whether a chimney access tower is enough or a full elevation is needed, which our scaffolding cost guide covers in detail.

What actually drives the number

Four things move this price far more than the builder's day rate.

How many floors come out. A ground-floor breast removed on its own leaves the first-floor breast and the whole stack above sitting on nothing. That load has to be picked up and carried back into the wall. Take the breast out on both floors and the support problem gets bigger, not smaller, because there is more masonry above and further for it to travel. Take the whole stack out to roof level and the structural problem largely disappears, but you have swapped it for roof work, scaffolding, and new tiles or slates across the hole.

Whether the stack stays. A retained stack is the expensive option per cubic metre of brick removed, because everything hangs off the support detail. It is also the option most people choose, because taking the stack down changes the look of the house and, on a terrace or semi, usually involves a neighbour who shares it.

Access. If nothing goes above ceiling level, there is no scaffolding and no roof trade. The moment the roofline is involved, add scaffolding and a roofer, and the job stops being a two-person internal job.

Making good. A chimney breast leaves a scar across the floor, the wall and often the ceiling. Plaster, floorboards, skirting and decoration are real money and are the line most often missing from a cheap quote. Our guide on how to check plastering quality is worth reading before you sign off that part.

The support method is the single biggest line

Two methods dominate. Gallows brackets are steel angle brackets bolted into the party wall on each side of the opening, with the retained masonry sitting on top of them. A steel beam spans the opening and bears onto padstones built into the wall at each end, the same principle as removing a load-bearing wall.

Brackets are cheaper because there is less steel, less cutting, and less propping. They are also far more dependent on the wall they are fixed into, and that is where the position has shifted.

LABC withdrew its technical guidance on gallows brackets after April 2024, which left the country with no national standard for them. In January 2026, CROSS-UK published safety report 1501 on the suitability of gallows brackets. Its Expert Panel found the concerns well founded. The technical point is about mortar, and it is the detail almost nobody explains to homeowners: modern mortars run roughly 4–12 N/mm², while historic non-hydraulic lime mortars run roughly 0.5–2 N/mm². Bracket fixings rely on bond strength in those joints to resist shear and pull-out. In a Victorian house built in soft lime mortar, that strength often cannot be demonstrated. The panel noted that a properly designed steel beam gives a verified and durable solution instead, and cited the Institution of Structural Engineers' view that steel beams should generally be adopted.

That is not a ban, and any page telling you gallows brackets are now illegal is wrong. It means the burden of proof has moved. A bracket design now has to be justified by calculation, and in many older houses it cannot be.

Council rules differ, and there is no national threshold

Because the national guidance went, individual building control teams have published their own conditions, and they do not agree with each other. These are examples, not a rule you can apply anywhere, and each authority revises its own note without announcing it.

Conditions as published by each authority's building control team and checked in October 2026. These notes are revised and withdrawn without warning, so treat every figure here as illustrative and confirm the current version with your own authority before you rely on it.

The practical takeaway is simple. There is no longer a national gallows bracket rule, so the only figures that matter are the ones your own local authority publishes. If a builder quotes brackets and cannot tell you which authority's guidance the design meets, they have not checked.

The party wall notice most quotes leave out

On a terrace or a semi, the chimney breast is almost always built into the wall shared with next door. That makes it a party structure, and the work is notifiable. The government's party wall guidance says so explicitly, and the two-month notice period comes from section 3 of the Act itself.

Two months is the part that catches people out. A builder with a gap in December will happily start in three weeks, and the notice period does not care. If your neighbour consents in writing, the cost is nothing but the time. If they dissent, surveyors are appointed and you pay, including your neighbour's surveyor. Our party wall guide sets out the process and the timings in full.

Party wall fees are the homeowner's cost, not the builder's, and they are almost never in a builder's quote. That is not dishonest in itself, but it does mean the number on the quote is not the number you will spend.

What your quote must show, line by line

A complete chimney breast removal quote separates these out:

• The structural engineer's fee, or an explicit statement that you are appointing one directly. Expect £300–£800 for calculations on a job this size, in line with our structural engineer cost guide.
• The support method, named. "Remove chimney breast to ground floor" is not a specification. It should say gallows brackets or a steel beam, with the beam size and the padstone detail once the engineer has calculated it.
• Fire protection to the new steel. A beam carrying the floor above normally needs 30 minutes' fire resistance, achieved by boarding it out in plasterboard or using intumescent paint. Steel sitting entirely within the roof space is treated differently. This is a small cost that is regularly forgotten, and Building Control will pick it up.
• Temporary propping while the masonry above is unsupported.
• Building Control application and inspection fees, or a note that you are applying yourself. Either a council team or a registered building control approver can do it.
• What happens to the retained stack. If the stack stays, it needs capping with a vented cowl and the old fireplace opening needs an air brick, or the flue traps moisture and you get damp on the wall you just rebuilt.
• Making good, itemised: plaster, floor infill, skirting, and whether decoration is included or excluded.
• Waste removal. A chimney breast produces a surprising volume of rubble and it has to be carried out by hand.

If the quote is silent on regs entirely, read what a quote missing building regs really means before you go further.

Common mistakes

Assuming gallows brackets are fine because a neighbour had them fitted. A bracket installation signed off in 2018 tells you nothing about what your building control team will accept now. The national guidance was withdrawn in 2024 and the CROSS report landed in 2026. Price the beam as an alternative so a refusal does not become a variation you have no comparison for.

No structural engineer anywhere in the quote. The support has to be designed before anyone knows what it costs. A quote that names a beam size before an engineer has done the calculations was guessed, and a quote with no engineer's fee at all is either hiding it or planning to skip it.

Nothing for the party wall notice, on a terrace. This is the single most common gap. The builder's price is genuine, the party wall cost is real, and the two months of notice sit in front of the start date whether or not anyone budgeted for them.

Removing the lower breast and leaving the upper one sealed and unventilated. A retained stack with no airflow gets damp, and the damp shows up on the chimney breast wall in the bedroom, months after the builder has gone. A vented cap and an air brick cost very little at the time and a great deal afterwards.

Taking the stack off the roof in a conservation area without checking. Internal removal usually needs no planning permission. The stack is different: it is visible, it is part of the character of the street, and conservation area or Article 4 rules can bite. On a listed building, listed building consent is required for the breast as well as the stack.

Check your quote

Chimney breast removal is a small job with a large number of ways to be underpriced. The support method, the engineer, Building Control, the fire protection on the steel and the party wall notice are five separate lines, and a cheap quote is usually cheap because two or three of them are not in it. We read the quote and tell you which ones are missing, and whether the price sits inside the range for the work described. It usually takes about ten minutes. For the wider method, see how to compare builder quotes properly.