Chimney Removal Costs UK — What to Charge to Remove a Chimney Breast in 2026

The Three Main Scopes of Chimney Removal

"Chimney removal" means very different things to different customers, and the scope drives almost everything about your price. Before you quote, establish exactly how much the customer wants gone — and how much actually needs to come out to achieve what they want.

• Stack only: Remove the chimney stack above the roof line and make the roof good. The breast stays inside the house. Cheapest option, often chosen when a stack is leaking or unstable but the customer doesn't need the internal space.
• Single-room breast (partial): Remove the chimney breast in one room — usually a bedroom — and support the remaining chimney above. The most common & popular job.
• Full removal: Take the chimney out completely, from the ground floor up through every storey, plus the stack and roof making-good. The biggest, most disruptive and most expensive scope.

The Critical Structural Point — You Cannot Just Knock It Out

This is the single most important thing to understand before you quote, and the point most DIY enquiries get wrong. A chimney is a continuous masonry structure. If you remove the breast in a downstairs or first-floor room, everything above it — the breast in the rooms above, plus the stack on the roof — is now unsupported and will, eventually, collapse. People have been killed by chimneys that were partially removed without proper support.

Whenever you remove part of a chimney and leave masonry above it, that remaining masonry must be properly supported. That means either galvanised steel gallows brackets bolted into a sound party or external wall, or a steel beam (RSJ) spanning the opening. This is not optional and it is not a judgement call you make on the day — it requires a structural engineer's calculation, Building Regulations approval via your local authority Building Control (or an approved inspector), and a sign-off inspection once the support is installed. If the wall is shared with a neighbour, you'll also need a Party Wall agreement under the Party Wall etc. Act 1996 before you start.

Quote these professional fees as separate line items every single time. Forgetting the structural engineer and Building Control fees is the number one way builders lose money on chimney jobs — they get absorbed into the labour figure and your margin disappears.

Partial vs Full Removal

The decision between partial and full removal is usually about how much space the customer wants back versus how much disruption they'll tolerate.

Partial (Single-Room Breast)

Removing the breast in just one room is the most popular job because it's the best value for the customer. They reclaim the space where it matters most — usually a master bedroom — while leaving the rest of the chimney in place, supported on gallows brackets or a steel. It's a one-to-three-day job for a small team, plus drying time for the new plaster. Because the chimney above stays put, the work is contained to one room and the customer can usually stay in the house.

Full Removal

Full removal takes the chimney out from the ground floor up, through every floor it passes, including the stack and roof. There's no masonry left above to support, which simplifies the structural design at the upper levels but massively increases the labour, the making-good, the waste and the disruption. You're opening floors and ceilings on multiple storeys, dealing with the roof, and replastering several rooms. Full removal makes sense when the chimney is on an external wall and the customer wants the whole feature gone, or when the stack is failing and the breast is redundant throughout.

Structural Support — Gallows Brackets vs Steel Beams

There are two standard ways to support the chimney that remains above the removed section, and the structural engineer will specify which is appropriate.

Gallows Brackets

Gallows brackets are L-shaped galvanised steel brackets bolted to the wall, with the chimney breast above resting on them. They're the cheaper, quicker option and are widely used for first-floor and loft-level breast removals. The catch: many engineers and Building Control officers will only accept gallows brackets where they bolt into a sound, solid wall — typically a 215mm-plus party wall in good brickwork. They are frequently refused on external cavity walls or poor masonry. Never assume gallows brackets are acceptable until the engineer has confirmed it.

Steel Beams (RSJ)

Where gallows brackets aren't suitable — weak masonry, a cavity wall, or a larger span — the chimney is supported on a steel beam built into the wall on padstones either side. This is more involved: you're cutting bearings, installing padstones, lifting steel into position and packing the masonry above. It costs more in materials and labour but it's the robust solution Building Control will sign off in situations where brackets won't do.

Building Regs and Party Wall

Chimney breast removal is notifiable structural work. You'll need:

• A structural engineer's report and calculations specifying the support method (brackets or steel) and the connections. Typically £300–£600.
• Building Regulations approval through Building Control — a Building Notice or full plans application, plus the inspection and completion certificate. Typically £300–£800 depending on the authority and scope.
• A Party Wall agreement if the chimney sits on a wall shared with a neighbour. At minimum you serve notice; if the neighbour dissents you may need surveyors, adding £700–£1,500+. Build this into the quote whenever a party wall is involved.

The completion certificate matters to the customer — without it, the work shows up as unauthorised when they come to sell, and a buyer's solicitor will flag it. Make clear in your quote that you'll obtain proper sign-off; it's a genuine selling point against cowboys who skip it.

Making Good — Plastering, Flooring and Roof

The demolition is the quick part. The making-good is where the time and the cost really sit, and where underquoting hurts most. Once the masonry is out, you're left with a gap that has to be brought back to a finished, decoratable state.

• Replastering: The wall where the breast was, plus the patched ceiling and reveals, all need re-skimming or full plastering. Budget per room and don't forget the rooms above and below on a full removal.
• Flooring: The hearth area leaves a gap in the floor that needs joists, boards and a level finish to match. On suspended timber floors this can mean new joists; on solid floors, infilling and screeding.
• Roof making-good (stack removal): When the stack comes off, the hole in the roof has to be infilled with new rafters/battens, felt and tiles to match the existing roof. Sourcing matching tiles on an older roof can be the awkward part — reclaimed tiles cost more.
• Decoration: Most quotes stop at a plastered finish ready for the customer to decorate; if they want it painted, price it separately.

Waste, Skip and Disposal

A chimney is a lot of brick, mortar and soot, and it's heavy. A single-room breast typically fills a good part of a builder's skip; a full removal can fill two or more. Skip hire runs roughly £250–£450 per builder's skip depending on region, and rubble is dense — you'll hit the weight limit before the skip looks full. Factor in carrying the debris out by hand through the house (often upstairs), protecting floors and staircases, and the dust control. Old chimneys can also contain soot and the occasional dead bird or nest, so allow for sweeping and bagging before you start knocking through.

Scaffolding for the Stack

Any work on the stack itself — whether stack-only removal or the top end of a full removal — needs safe access to the roof under the Working at Height Regulations 2005. That means scaffolding to the eaves with a working platform and, in most cases, a chimney scaffold or crash deck around the stack. For a standard two-storey house budget £700–£1,500 for scaffolding; complex roofs, three storeys or restricted access push this higher. Quote scaffolding as a separate line so the customer sees it's a genuine third-party cost and you're not undercut by anyone planning to lean a ladder against the roof.

What Affects the Quote

Two chimney jobs that look identical from the street can vary by thousands. The main drivers are:

• How much is removed: Stack only, one room, or the full height through every floor — the single biggest factor.
• Structural complexity: Simple gallows brackets into a solid party wall vs a steel beam on padstones in a cavity wall. The steel solution adds materials, labour and engineering.
• Access: Terraced house with no side access where everything comes out through the front door and upstairs, vs a ground-floor room next to a driveway. Carrying rubble adds real labour.
• Making good: A simple plaster patch vs replastering several rooms, new flooring and matching old roof tiles.
• Professional fees: Structural engineer, Building Control, and Party Wall where a neighbour is involved — these are fixed costs that must be in the quote.

How to Quote Profitably

The margin on chimney removal is lost in the costs that don't involve swinging a lump hammer. The demolition labour is easy to estimate; the trap is forgetting everything around it. Before you give a number, make sure your quote includes:

• Structural engineer's fee and Building Control application — never absorb these into labour
• Party Wall costs if a shared wall is involved
• The full making-good scope: plastering all affected rooms, flooring, and roof tile matching
• Scaffolding for any stack work
• Skip hire and the labour to carry heavy rubble out, often through the house
• Dust protection, floor and stair coverings, and a clean-down at the end

Price each of these as its own line in the quote. It protects your margin, it shows the customer exactly what they're paying for, and it makes you look more professional than a competitor who scribbles a single figure on the back of an envelope and then discovers the building control cost halfway through.

It also helps to know which of these jobs are actually worth your time. Tracking your enquiries and completed work in Trade2Base shows you which marketing channels and job types are bringing in paid work versus tyre-kickers, so you can spend more time on the chimney and structural jobs that pay and less chasing quotes that go nowhere.

Quick Reference: Chimney Removal Prices UK 2026