Chimney Breast Removal Highbury
Chimney breast removal with steel beam support in Highbury, the beam sized by the engineer we appoint and the work signed off by building control.
- Rated 4.9 from 31 reviews on MyBuilder
- London guide: £2,200 to £3,250
- Free site survey, itemised quote
Gallows brackets were once the standard answer for a first-floor stack in a Highbury terrace. Since LABC withdrew that detail in 2024, most inspectors want a beam instead, and we price accordingly. The engineer sizes it, we prop the opening, install the steel onto padstones, and leave the room near Highbury Fields squared off.
In Highbury, removing a breast on one floor typically costs £2,200 to £3,250 on a steel beam, and £3,000 to £5,000 across two floors (indicative London ranges, MyBuilder and Checkatrade, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Highbury.
Price guide
| Work | Indicative London range |
|---|---|
| One floor, steel beam (the usual route) | £2,200 to £3,250 |
| One floor, gallows brackets where the engineer and building control accept them | £1,500 to £2,500 |
| Two floors | £3,000 to £5,000 |
Indicative London ranges (MyBuilder and Checkatrade, 2026), not a quotation. Prices checked September 2026. Full breakdown: Chimney Breast Removal Guide.
How the job runs
- Free site survey at your Highbury address: which floors the breast runs through, a shared stack, any live flue.
- The engineer we appoint designs the support, and the work is registered with Islington Council building control or an approved inspector. On a shared wall you serve the party wall notice as building owner; we supply the drawings.
- The floor above is propped and the breast comes down in courses from the top; what remains sits on the support the engineer specified.
- Building control inspects the support before it is covered. We make good, and the completion certificate follows.
Removing a chimney breast in Highbury
Many of Highbury's bay-fronted terraces still carry their original chimney breasts in the front and rear rooms, long after the fires stopped being used. Removing a breast frees up a surprising amount of floor space, but the masonry above still has to go somewhere. The breast helps carry the stack overhead, so we never take one out without first working out how the weight above will be supported.
Where we remove a breast on the lower floors but keep the stack above, we support that retained masonry on a steel beam, or on gallows brackets bolted into the party wall only where the engineer and building control accept them. In some N5 houses the stack is redundant all the way up, in which case we often take it out entirely and make the roof good, which removes the load altogether.
Housing in Highbury
On the valuation list Highbury counts about 7,960 homes, 79% flats and 21% houses; 55% predate 1919, 4% are interwar and 37% post-war. Most homes here are flats, and a chimney breast in a flat in Highbury often supports the breasts in the flats above, so removal needs the freeholder's licence and designed support.
The stack above the roof in a Highbury chimney breast job
In a Highbury house that is still one home, and houses make up 21% of homes here, Islington allows a building notice, so work can start 48 hours after the notice is given with the correct fee. That speed only helps if the design is ready. The structural engineer we appoint needs to have seen the breasts on every floor, the stack in the loft space and the party wall it stands on before the notice goes in. In a terrace the stack on the party wall can carry next door's flues beside yours, so the support left under it, and any work to it, affects both houses.
Taking the stack down above the roof is a separate decision from taking out the breasts. Islington has removed permitted development rights for some minor alterations in 40 of its 42 conservation areas with article 4 directions. The examples it gives are doors, windows and painting brickwork, so whether a chimney stack is caught turns on the wording for your street. The Highbury Fields conservation area has its own design guidelines, adopted in January 2002. Reading the direction and the guidelines before the scaffold goes up decides whether the stack is kept, capped or taken down, and that changes what the steel has to carry.
Party wall and building control in N5
In Highbury's tightly packed terraces the chimney stack almost always sits within the party wall shared with the house next door. Removing the breast, or bolting gallows brackets into that shared wall to hold the stack, is notifiable under the Party Wall Act, so you serve notice on the neighbour and agree the condition of the wall before any work begins.
The structural support is a Building Regulations matter, and Islington Council's building control inspects and signs off the beam or brackets. This is not planning permission territory, though a listed home needs listed building consent for internal work. We appoint the engineer, handle the inspections, cap any redundant flue with ventilation to keep damp out, and replaster so no trace of the breast is left.
The errors we are called to correct
The chimney work we get asked to put right in N5 falls into three familiar types. A breast removed with no support at all, discovered when cracks appear in the bedroom above. A flue sealed at both ends, which traps moisture and produces damp patches on the chimney wall within a year. And brackets or a beam fixed into a party wall that proved to be soft or half thickness once the plaster came off. A fourth is more cosmetic but still costly, which is reinstating a wall without allowing for the difference in plaster thickness either side.
None of those are hard to avoid, they are simply skipped. We have the engineer establish the load before anything comes out, we open up and inspect the masonry the support will fix into, and we cap the flue at the head while leaving a vent low down so air can move through the shaft. The extra time that takes is a day or two, considerably less than putting any of it right later.
- Loft inspection of the retained stack before work starts
- Structural engineer's calculations arranged and followed
- Hearth removal and floor structure reinstatement
VOA Council Tax stock of properties, March 2025, for Highbury and Highbury Fields. Counts rounded by the VOA.
Why Highbury Homeowners Choose GS Renovation
Highbury homeowners choose GS Renovation because we treat chimney breast removal as the structural job it is. You get engineer-designed support, usually a steel beam, with gallows brackets only where the engineer and building control accept them, correctly fixed, Islington building control handled end to end, and tidy working in your occupied N5 home, all finished and signed off and backed by our founder's 30+ years on the tools.
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FAQ
Frequently Asked Questions about Chimney Breast Removal Highbury
What does the chimney breast removal quotation for a Highbury home cover?
The chimney breast removal quotation for a Highbury home covers the whole job through to sign-off, typically within £2,200 to £3,250 for one floor on a beam (indicative). It lists the structural work, the following trades, building regulations approval of the support under the retained stack, and the making good at N5, with the engineer's design shown as its own line. GS Renovation issues it in writing so you have something to hold us to.
How long does the party wall process take before work starts in Highbury?
You serve the notice as building owner at least two months before work on the party wall starts, and your neighbour has 14 days to reply. Written consent, with agreement to an earlier start, can shorten the wait; a dissent means surveyors are appointed, a schedule of condition is prepared for the adjoining rooms and an award is agreed, which can add weeks. The notice period is the single biggest cause of delay on N5 jobs, and it runs from service, not from the day you decide. Start the process early and it rarely holds anything up.
Can I remove the chimney breast in my Highbury flat if the flat above keeps theirs?
Yes, provided their breast is carried on a structure designed for it: a steel beam spanning beneath it, or gallows brackets only where building control accepts them for that wall. The engineer sizes the support, the freeholder gives written consent because the masonry belongs to the building, and the owner above is told what to expect. Leaving the breast above unsupported is never an option.
Should the whole stack come down if every breast in my Highbury house is removed?
It is often the cleaner result, since a stack standing on nothing but brackets in the loft is a permanent weak point. Taking it down means roofing repairs and making good the party wall. Where the stack is shared with next door, their flues must stay, so only your half can be dismantled and the remainder is supported. You serve the neighbour a party structure notice first.
Does a chimney breast removal in Highbury need a completion certificate?
Yes, and it matters most when you sell. Islington building control inspects the steel or brackets and issues a completion certificate once satisfied. Buyers' solicitors routinely ask for it alongside the engineer's calculations and any party wall award. Without it, the only way to prove the support is to open the ceiling again, which is far harder with the flat occupied and furnished.
Is the chimney breast in my Highbury front room carrying anything besides the stack?
Often the floor. In period houses the joists around a hearth are trimmed, meaning shorter joists are carried on a trimmer that bears into or onto the breast. Remove the breast and those joist ends need new support. The engineer checks by lifting boards in the room above before design. Missing this detail is how floors sag after an otherwise tidy removal.
Why does the engineer want to see the loft before a Highbury chimney breast comes out?
Because the load the new support carries is decided above the ceiling. In the Victorian terraces near Highbury Fields the stack can carry several flues and can be in poor repair where it passes through the roof. The engineer needs its size, the state of its brickwork and whether it is shared with next door before sizing anything, and that survey is far easier from the loft than after a ceiling has come down.
The flat above in a Highbury building has lost its chimney breast. Does that matter?
It matters, because it changes what your breast is carrying. Done properly, the brickwork above their old breast sits on designed steel or brackets, not on yours. Ask the freeholder whether a completion certificate exists for that earlier work; Islington issues them after satisfactory completion of works in accordance with the building regulations. Where there is none, the engineer opens up where that support should be, and any fault is put right before any of your breast is cut.
Is a chimney breast in a listed Highbury house handled differently?
Yes. Islington says the borough has around 4,500 listed buildings, and listing covers the inside of a building as well as the outside, so removing a breast from a listed house needs listed building consent alongside building regulations approval. A locally listed house is different: Islington says listed building consent is not needed for works to a locally listed building, though the usual planning controls apply. Checking the status is the first step, before the engineer is instructed.
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