Chimney Breast Removal Costs UK — What to Charge in 2026

Why Chimney Breast Removal Is Structural Work

A chimney breast is the projecting column of brickwork that houses the flue. It runs up through the house and supports the masonry above it — the breast in the bedroom carries the breast in the loft, which carries the stack on the roof. Remove a section without supporting what sits on top of it and you bring the lot down. This is why chimney breast removal is never a "rip it out on a Saturday" job. It is notifiable structural work that needs proper design and sign-off.

Every job starts with the same question: what is going to hold up everything above the section you're taking out? The answer drives the price. There are two broad approaches, and the customer's budget often decides which one you end up doing.

The Two Main Options

Single-Room Removal (Support the Breast Above)

The most common request is to remove the chimney breast in one room only — usually a ground-floor reception room or a bedroom — while leaving the breast intact in the rooms above and the stack on the roof. Because you're leaving masonry overhead, you have to transfer its weight onto a new support. There are two accepted methods:

• Gallows brackets: a pair of steel brackets bolted to the party wall (or a suitable structural wall) that cantilever out to carry the chimney breast above. Cheaper and quicker, but the wall they fix to must be sound brickwork at least 215mm thick — the structural engineer must approve their use. Not permitted on every property.
• Steel beam / RSJ: a beam built into the wall to span the opening and carry the load above. More robust, suitable where gallows brackets aren't viable, but more labour and a bigger making-good task.

Single-room removals typically run £1,500–£3,000 including the structural support, depending on which method is used, the floor it's on, and access. Gallows brackets sit toward the lower end; a built-in beam pushes it higher.

Full Stack Removal (Ground to Roof)

The alternative is to remove the breast on every floor along with the stack and chimney above the roofline — the whole flue, top to bottom. This avoids the need to support anything above (there's nothing left to support), but it adds work at roof level: removing the stack, re-tiling or weathering the hole left in the roof, and dealing with scaffolding for the high-level work.

Full removals typically cost £2,500–£5,000+. The wide range reflects the number of floors, scaffolding, roof making-good, and whether the stack is shared with a neighbour. A three-storey terrace with a shared stack and complex roof detail can run well beyond the top of that range.

Structural Engineer's Calculations

Almost every chimney breast removal needs a structural engineer. They calculate the load being removed and specify the support — the size of the steel beam and its bearings, or confirmation that gallows brackets are acceptable and how they must be fixed. Building control will want to see these calculations before they sign anything off, so this is not a step you can skip to win the job on price.

Engineer fees for a domestic chimney breast typically run £300–£600 for a site visit and calculations. Build this into your quote as a separate line, or have the customer instruct the engineer directly. Either way, never price the structural work off your own assumptions — the engineer's spec is what protects you if anything moves later.

Building Control and Building Regs Sign-Off

Chimney breast removal is notifiable work under the Building Regulations. You either submit a building notice or full plans to the local authority building control (or use an approved inspector). They inspect the structural work — the beam bearings, the bracket fixings, the support arrangement — and issue a completion certificate once satisfied. That certificate matters: without it, the homeowner can hit problems when they come to sell, because conveyancing solicitors routinely ask for building regs sign-off on structural alterations.

Building control fees vary by authority but typically fall in the £300–£600 range for this kind of work. Make sure the customer understands that the certificate is part of what they're paying for — a removal without sign-off is a liability for them and a reputational risk for you.

Party Wall Considerations

Many chimney breasts are built into the party wall shared with a neighbour, and the stack is often shared too. Where the work affects a party structure, the Party Wall etc. Act 1996 applies and the homeowner must serve notice on the adjoining owner before work starts — typically two months' notice for party structure work. If the neighbour dissents, surveyors get appointed and a party wall award is drawn up.

This isn't your responsibility to serve, but you should flag it clearly in your quote, because it affects the timeline and the customer's costs. Party wall surveyor fees can add £700–£2,000+ if the matter goes to award, and the notice period can delay your start date. A customer who finds out about party wall obligations after they've signed with you is an unhappy customer — raise it up front.

Supporting Steelwork and Brackets

The support method is the heart of the job. Gallows brackets are the cheaper route where the engineer permits them — a pair of fabricated steel brackets, resin-anchored or bolted through the wall, carrying the masonry above on a steel angle. Material and fitting costs are modest, but the wall they fix into must be checked carefully; gallows brackets are not acceptable on thin or poor-quality walls.

Where a beam is required, you're looking at the steel itself, the padstones or spreader plates at the bearings, and the labour to cut the pocket, insert and pack the beam, and rebuild around it. Allow for the steel supplier's fabrication time on anything non-standard. As a rough guide:

• Gallows brackets supplied and fitted: £400–£800
• Steel beam / RSJ supplied, installed and built in: £800–£1,800

These figures sit inside the headline removal price rather than on top of it — but knowing the breakdown helps you quote confidently and explain the difference when a customer asks why one method costs more than the other.

Making Good — Where the Hours Disappear

Builders consistently underestimate the making good. Once the breast is out, you're left with a scarred wall, a hole in the floor where the hearth was, broken skirting runs and a ceiling that needs patching. None of this is optional — the room has to come back together properly. Making good usually includes:

• Plastering: re-plastering the wall where the breast sat, plus patching the ceiling and any chased-in areas. Often the single biggest making-good line.
• Flooring: filling the hearth recess, levelling and matching the existing floor — joists may need extending where the hearth was a separate slab.
• Skirting and architrave: running new skirting across the reclaimed wall to match the existing profile, which on older properties may need bespoke matching.
• Redecoration: the customer almost always expects the affected wall — and often the whole room — repainted to a finished state.
• Roof making-good (full removals only): weathering or re-tiling the hole left when the stack comes off, including new battens, felt, tiles and lead flashing as needed.

Decide early what your quote includes. A bare structural removal with the customer arranging their own decorator is a very different number from a turnkey job finished ready to furnish. Spell it out in writing — "making good to plastered finish, decoration excluded" saves a lot of arguments at handover.

Capping Gas, Flues and Ventilation

Don't forget the services running through the breast. If there's a live gas supply to an old fire, it must be capped off by a Gas Safe registered engineer before you touch the masonry — that's a legal requirement, not a nice-to-have. Any redundant flue should be capped at the top and ventilated at the bottom to prevent damp and condensation building up in a sealed cavity.

On full stack removals you're taking the flue out entirely, so this is less of an issue, but on single-room jobs where the flue above remains, ventilation of the retained flue matters. Allow £80–£200 for gas capping by a registered engineer where one is needed, and factor in airbricks or vents for any retained flue.

What Pushes the Price Up

Two superficially similar chimney breast jobs can carry very different prices. The main factors that move your quote:

• Number of floors: a single ground-floor removal is straightforward; removing the breast on multiple floors, or a full stack through a three-storey house, multiplies the labour and the support work.
• Access: tight terraces, upper-floor rooms, no side access for muck-away and material handling all add time and cost. Carrying broken masonry down two flights by hand is slow, dusty work.
• Scaffolding: any work at roof level on a full removal needs scaffolding — typically £800–£1,500+ for a two-storey property, more for a terrace where you can only access from the front.
• Gas and flue capping: a live supply or multiple flues to deal with adds engineer time and ventilation work.
• Shared / party wall stacks: party wall notices, possible surveyor involvement and the constraints of working on a shared structure all add cost and time.
• Waste disposal: chimney masonry is heavy. A skip or grab-away for the rubble is a real cost — a single breast can fill a small skip on its own.

Quoting Tips — What to Check Before You Price

Chimney breast quotes go wrong when the builder prices off the customer's description rather than a proper look. Before you commit a number:

• Confirm what's being removed: one room, multiple floors, or the full stack? Each is a different job and a different price bracket.
• Check the wall the support will fix to: gallows brackets need sound, thick brickwork. If the wall won't take them, you're into a beam — and a higher cost.
• Identify shared structures: establish early whether the breast or stack is shared with a neighbour so party wall obligations can be flagged.
• Trace the services: live gas, redundant flues, vents — note what needs capping or ventilating.
• Agree the finish level: structural only, plastered, or fully decorated? Put it in writing.
• Allow for engineer and building control: these are near-certain costs — quote them in rather than springing them on the customer later.

A clear, itemised quote that separates the structural work, the engineer and building control fees, the making good and any party wall flag puts you ahead of competitors who just send a lump-sum number. It shows the customer you understand the job — and it protects your margin when the inevitable extras come up.

Quick Reference: Chimney Breast Removal Costs UK 2026