Reclaiming the floor and wall space a chimney breast steals — on the ground floor, the first floor or full height — with the masonry above properly supported on gallows brackets or an engineered steel beam, the structure signed off by Building Control and the Party Wall process handled for you. Designed by our in-house structural engineers and built by our own trades under one fixed-price contract.
A chimney breast eats into a room — a metre-deep block of redundant masonry, usually housing a fireplace no one lights any more, taking floor space, dictating where furniture goes and breaking up the wall. Removing it is one of the highest-value small projects in a London house: it squares off the room, frees a useful run of wall, and often makes the difference between a bedroom that fits a proper wardrobe and one that does not.
But a chimney breast is structural, and that is where it has to be done correctly. Whatever you leave behind — the breast on the floor above, the stack on the roof, or your neighbour's flue sharing the same party wall — has to be carried by something. This page is for doing exactly that: chimney breast removal on the ground floor, the first floor or full height, engineered properly, signed off by Building Control, with the Party Wall process handled.
The two ways the masonry above is supported are gallows brackets — steel brackets bolted into a sound party wall — or, more robustly and more often, a steel beam spanning the opening. Which is appropriate depends on the load, the condition of the wall and what Building Control will accept; our in-house structural engineers specify it rather than leaving it to chance. An unsupported or poorly supported chimney breast is one of the most common defects flagged in home-buyer surveys, and it can derail a future sale — so the completion certificate we provide matters as much as the finished wall.
Chimney breast removal is frequently done alongside a knock-through or as part of opening up a ground floor, and we coordinate the two under one programme. For the broader structural capability behind this work, see structural works.
What you remove — and what is left to support — defines the engineering. These are the six situations we handle most.
The breast removed in the ground-floor room, with the breast and stack above retained and supported on gallows brackets or a steel beam. Reclaims the most-used living space — and the scenario that most needs proper engineering for what is left above.
The breast removed in an upstairs bedroom while keeping the ground-floor fireplace below. The breast above (in the loft) and the stack are supported. A favourite where a bedroom is just too tight for a wardrobe along the chimney wall.
The whole breast removed through every floor, with the stack taken down to roof level and the roof made good. No retained masonry to support internally — structurally the simplest outcome — but a bigger job involving scaffold and roof works.
The breast removed on both main floors, retaining only the loft breast and stack on supports. Reclaims space in two rooms at once — efficient, since the scaffold, propping and Party Wall process are shared across one project.
Removing the chimney breast and the dividing wall together to fully open a reception room. Both are structural and both need their own support and sign-off; doing them in one go is tidy and efficient. See our knock-through page for the wall side.
Where you want to keep a working fireplace or the external stack — common on Listed and Conservation Area homes — the breast is slimmed or removed in one room while the flue and stack are retained, supported and weatherproofed. A specialist, heritage-aware approach.
Removing a chimney breast safely is a careful structural sequence. Every element below is delivered and warranted under one fixed-price agreement.
We assess the breast, what it carries, the condition of the party wall and what must be supported once it is gone — the basis for choosing gallows brackets or a beam, and for an honest price.
Our MIStructE engineers design the support method, size the brackets or beam, check the party wall masonry and produce the calculations for Building Control — the legally required structural design, kept on record.
Where the wall is sound and the load suits, galvanised steel gallows brackets are bolted into the party wall to carry the retained breast above — installed precisely to the engineer's detail, with the Party Wall consent in place.
More often, a steel beam spans the opening to carry the masonry above — stronger than brackets, not reliant on the neighbour's wall alone, and frequently the method Building Control prefers. Sized, seated on padstones and levelled.
The structure temporarily propped, the breast removed in controlled sections from the top down, debris managed cleanly, and the support installed before the props come out — the sequence that keeps the work safe.
The wall reinstated where the breast was, the floor made good across the reclaimed area, the ceiling repaired, and the recess squared off — so you are left with a flat, usable wall and no trace of the breast.
Redundant flues capped and ventilated to prevent damp; the stack taken down and the roof made good on a full-height removal, or supported and weatherproofed where retained. Any gas connection safely capped by a Gas Safe engineer.
Redundant hearths lifted and made good, retained fireplaces protected and left fully functional, and the room left ready for the floor finish — no awkward raised hearth where the fire used to be.
Any pipework, radiators, sockets or aerials on or around the breast re-planned and re-routed cleanly into the reclaimed wall — so the new flat wall is usable from day one.
Full Building Regulations submission for the structural support, with the work inspected before it is concealed and a completion certificate issued — the document a future buyer's surveyor will look for.
Because chimney breasts usually sit on the shared wall, we serve the Party Wall notices, prepare the schedule of condition and agree the award through our sister surveying company — the step most often overlooked.
Plastering and full decoration so the reclaimed wall matches the room, a two-stage snag, a 12-month defects period and a 10-year workmanship warranty.
The whole job turns on supporting whatever the removal leaves above. Here are the six things our engineers resolve before the breast comes out.
We establish exactly what sits above the part you are removing — the upper breast, the loft breast, the stack — and its weight, because that load defines the support. Guesswork here is how chimney breasts end up dangerously unsupported.
Steel brackets bolted into a sound party wall can carry a retained breast where the load is modest and the wall and mortar are good — subject to the neighbour's consent under the Party Wall process. Economical, but only where appropriate.
More commonly we span the opening with a calculated steel beam carrying the masonry above. Stronger, not dependent on the neighbour's wall alone, and often the only method Building Control will accept — our default where the load warrants it.
The shared wall the breast sits on may also carry the neighbour's flue. We assess its condition and coordinate with the Party Wall process so the support is fixed correctly and lawfully.
On a partial removal the roof stack stays and must be carried all the way down; on a full removal it comes off and the roof is made good. Either way the stack — and any shared flue — is dealt with deliberately, not ignored.
An unsupported chimney breast is a classic home-buyer-survey red flag that stalls sales. The engineered support and the Building Control completion certificate we provide are what give you, your insurer and a future buyer confidence.
Even a single-room removal benefits from a disciplined, properly sequenced approach. Here is how we run it.
We look at the breast you want gone, discuss whether you are keeping any fireplace, and talk realistic budgets. No charge, no obligation.
A survey establishing what the breast carries, the party wall condition and what must be supported — the basis for the support method and a firm price.
The engineer determines gallows brackets or a steel beam, and we show you the impact on the room, the flue and any retained fireplace before you commit.
Calculations for the brackets or beam and their fixings, produced by our MIStructE engineers, ready for Building Control.
Building Regulations submission, and Party Wall notices served on the affected neighbour with the award agreed before work begins.
Structure propped, support installed, breast removed from the top down, stack dealt with, opening made good. Building Control inspects the support.
Plastering, services re-routing, floor and ceiling repair and decoration to match the room, then a snagging walk and the completion certificate.
A 12-month defects rectification period, a six-month service visit and a 10-year workmanship warranty.
A chimney breast removal can be a plain reinstated wall or a beautifully finished one. Here is how our four tiers differ.
For a representative single-floor chimney breast removal at around £4,000, here is the honest breakdown of where every pound is spent.
Chimney breast removal is structural engineering first. Here is what is calculated and installed.
Removing a chimney breast is rarely a planning matter — but it is always a Building Regulations one, and very often a Party Wall one too.
Removing an internal chimney breast does not normally need planning permission, because it does not change the outside of the house. The exception is taking down the chimney stack on the roof, which alters the elevation and can require permission — particularly in a Conservation Area — or Listed Building Consent on a Listed property. The internal structural work, however, always requires Building Regulations approval, because supporting the retained masonry safely is exactly what the Regulations exist to control. The completion certificate that follows is also what a future buyer's surveyor will ask to see.
The Party Wall etc. Act 1996 very often applies, because chimney breasts typically sit on the wall shared with the attached neighbour — and that neighbour frequently has their own breast or flue backing onto yours. Cutting into the shared wall, or fixing gallows brackets to it, triggers the Act. Notice must be served, a schedule of condition prepared and an award agreed before work starts. This is the step most commonly skipped, and the one most likely to cause a dispute if it is.
We confirm exactly what your removal needs at survey and manage every approval — Building Control, Party Wall, and any planning or Listed Building Consent for stack works — through our in-house team and sister surveying company. For an early budget, use the cost calculator; if you are also taking out a wall, see knock-through.
A representative programme for a ground-floor chimney breast removal with a steel beam supporting the breast above. Yours will differ by scope, but this is what a properly run removal looks like.
This is a job many do cheaply and wrongly. Here is what makes ours safe, certified and worth the difference.
Our own MIStructE engineers design the support — brackets or beam — rather than leaving a structural decision to a general builder's judgement.
We never remove a breast without engineering the support and obtaining Building Control sign-off — the opposite of the unsupported removals surveys flag every week.
Because the breast is usually on a shared wall, we manage the Party Wall notices and award through our sister surveying company — the step most often missed.
One agreement covering survey, design, support, approvals and finishes. No cost-plus surprises once the wall is open.
We leave a flat, usable wall that matches the room — not a lumpy patch where the breast used to be.
Experience retaining and restoring period chimneypieces and stacks where you want to keep the character, including on Listed homes.
Professional indemnity and public liability at £10M, well above industry standard.
An insurance-backed workmanship warranty protecting the structural work long after completion.
Chimney breast removal often sits within a wider project. Start here, or speak to us about combining it under one contract.
Frequently done alongside chimney breast removal to fully open up a reception room.
Removing breasts and walls together to create a single open-plan ground floor.
The full structural capability — beams, openings, underpinning and floor strengthening.
The calculations and detailing behind every support, by MIStructE engineers.
Reclaiming the chimney wall is often the start of a wider reception-room refresh.
Repairs, repointing and works to chimneys and stacks you are keeping.
Breast removal as part of a wider whole-house renovation, delivered as one programme.
The notices and awards required where a chimney breast sits on a shared wall.
Comparable projects with real structural work and finishing standards. Browse the case-study hub, and for survey-led due diligence before you commit, see surveying support.
Structural reconfiguration including chimney and wall works within a full renovation.
View case study →Breasts and load-bearing walls removed on engineered support to open up the ground floor.
View case study →Structural opening and reconfiguration creating an open kitchen-living space.
View case study →Browse the full portfolio of structural work, conversions and renovations across prime London.
View portfolio →“I would like to thank Ross and his team for their consistent commitment to quality and their unerring reliability. They delivered our property to specification and on time, proving to be an extremely effective, experienced, and proactive contractor.”
“We have worked with Ross and his company many times. They are extremely professional and hardworking individuals who can work under any circumstances. There was no variation to the works.”
Book a no-obligation consultation at our Finchley Road design studio or in your home. The first meeting is free, lasts 60–90 minutes, and concludes with an honest indication of feasibility, programme and budget band. No salespeople. No pressure.
Site visit · feasibility assessment · outline cost estimate · programme indication. No obligation. Saturday appointments available.