Chimney Breast Removal Edgware
Chimney breast removal with steel beam support in Edgware, 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
Detached houses near Canons Park, on the Harrow side of Edgware, raise a different question from terraces: with no shared wall there is no party wall notice to serve, but the stack still has to be carried. That means a beam bearing onto padstones built into your own brickwork. A structural engineer specifies it and we install it exactly as drawn.
In Edgware, 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 Edgware.
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 Edgware 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 Barnet 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 Edgware's semis
Most interwar Edgware houses still carry their original chimney breasts, typically in the front reception and the main bedroom above, with the stack rising through the roof. On a semi, that stack frequently sits within the party wall shared with the neighbouring house, so the masonry it holds up is not something to disturb without a plan. We start with a structural engineer's assessment of exactly what the breast is supporting.
Where you remove a breast on the ground and first floors but keep the stack in the loft and above the roofline, that retained masonry must be carried. We support it on a steel beam bearing on padstones, the usual route since LABC withdrew its standard gallows detail in 2024, or on gallows brackets bolted into the party wall only where the engineer and building control accept them. If the whole stack is redundant and not shared with next door, it can come down entirely and the roof made good, so nothing is ever left hanging.
Housing in Edgware
Count the homes in Edgware and you get about 18,930: 41% built since 1945, 57% between the wars and 2% before 1919, with flats at 38% and houses at 62%. 39% of homes here are semi-detached; the main stack of a semi in Edgware is usually on the wall shared with the other half, so removing that breast needs a party wall notice.
Live flues and shared stacks behind an Edgware chimney breast
50% of Edgware homes are semi-detached or detached houses, and on a semi the stack you want to cut back may also carry flues from next door. Before anything is designed, find out which flues are still in use on either side. A gas fire, an old back boiler or a solid fuel stove next door may be venting through the same block of masonry, and removing your breast must leave their flue intact, sound and properly supported. We look at the pots, ask the neighbour, and have the flues checked where there is doubt, so the engineer designs around what is live rather than assuming the whole stack is redundant.
The age of the house affects what comes out of the wall. 57% of Edgware homes were built between 1919 and 1939, when flues were normally parged with mortar rather than lined, and later decades often added a gas fire with a flue pipe and a closure plate. When the breast is opened, that older material comes away as soot, grit and loose parging, so the room is sealed off from the rest of the house before breaking out starts. Any flue that stays in use on your side is left untouched or relined by a registered gas engineer or a qualified chimney engineer, depending on the appliance it serves.
Party wall and building control in HA8
Because the Edgware semi's chimney stack usually lies within the shared party wall, removing the breast or fixing gallows brackets into that wall is notifiable under the Party Wall Act, and you serve notice on your neighbour before any work begins, as building owner or through your surveyor; we give you the engineer's drawings for it. The structural support itself falls under building regulations, and Barnet Council's building control (Harrow's, on the Canons Park side) or a registered building control approver inspects and signs it off.
We manage the whole job: the engineer's calculations, safe demolition with propping, and installing the beam, or brackets where the engineer and building control accept them, to hold the stack. We cap any redundant flue with proper ventilation so it cannot trap damp, then replaster and make good so there is no sign the breast was ever there. It is one team from first survey to completion certificate.
Scaffold, roof and programme on a detached house
On a detached house near Canons Park there is no party wall notice to serve, which removes two months from the front of the programme but adds work at the top. Taking the stack right out means scaffolding to roof level, and the scaffold has to stand on your own ground with a clear route past the side of the house. We check that access before quoting, because a narrow side passage or a conservatory can rule it out.
The stack then comes down from the top in courses, the roof opening is framed and the tiles relaid, and only then does the internal work start. Booking the scaffold, the roofing and the internal trades in that order avoids the common problem of an open roof waiting on a subcontractor. In HA8 the whole sequence usually takes a fortnight, with the noisiest days confined to the demolition itself and the tile stripping above it.
- Ceiling and joist support where the breast carried them
- Flue capping with ventilation to keep the stack dry
- Making good, plastering and reinstating the wall line
VOA Council Tax stock of properties, March 2025, for all 5 statistical areas in Edgware. Counts rounded by the VOA.
Trusted Chimney Breast Removal in Edgware
Edgware homeowners choose GS Renovation because we treat chimney breast removal as the structural job it is. You get support designed by the structural engineer we appoint, usually a steel beam with gallows brackets only where the engineer and building control accept them, work programmed around any party wall notice you serve, building control handled with Barnet or Harrow, tidy working in an occupied home, and a signed-off finish, backed by our founder's 30+ years on the tools.
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FAQ
Frequently Asked Questions about Chimney Breast Removal Edgware
What drives the cost of chimney breast removal in an Edgware home?
What sits behind the walls moves the price of chimney breast removal in Edgware far more than the address does, within £2,200 to £3,250 for one floor on a beam (indicative). In practice removing one floor or two decides the support, and that is only settled at the HA8 survey. Older Barnet stock adds making good and awkward access adds labour, so both are itemised. Ring 07472 424 226 before comparing figures.
Can the chimney breast be removed downstairs and the stack kept above?
Yes, with the stack supported on a steel beam designed by an engineer, or gallows brackets where the engineer and building control accept them, though keeping the stack is also what Barnet's guidance prefers. Barnet's draft design guidance asks applicants to retain chimney pots and stacks, party walls and ridge tiles where possible, and the Watling Estate appraisal praises roofs that are plain and clutter free. Removing the stack entirely changes the roofline of the pair, so the supported option keeps the street elevation intact.
What happens to the roof where a stack is taken out on a Watling Estate house?
The roof is made good in matching materials, which on the Watling Estate means traditional clay tiles or single roll clay pantiles over red brick walls. The conservation area appraisal also records rough cast render and matt black timber weatherboarding. Salvaged tiles from the same roof are the safest match, because modern concrete tiles read as a patch from the street.
Does removing a chimney breast need building regulations approval?
Yes, because it is structural work and the remaining brickwork above has to be supported and inspected. In Edgware that approval sits with Barnet Council, or Harrow Council for homes on the Canons Park side, west of the High Street, or with a registered building control approver. Only the council can take enforcement action under the Building Act 1984, and unapproved removals tend to surface later, at survey, when the house is sold.
Does a locally listed house in Barnet stop a chimney breast coming out?
No, local listing does not trigger listed building consent, so the removal is judged on building regulations rather than heritage consent. Policy CDH08 Part E of Barnet's Local Plan places locally listed buildings among the borough's non designated heritage assets and asks for a balanced judgement weighing harm or loss against public benefits. That test bites on external changes, so keeping the stack while taking the breast out avoids the argument.
Will scaffolding for the stack need a licence from the council?
Yes, if it stands on the public highway or footway, Barnet requires a licence to erect or retain scaffolding, charged by the month. Separate licences cover hoardings and fences and the temporary deposit of materials in a street, and the council sets penalty charges for erecting a scaffold without a licence and for depositing building materials without one. Scaffolding wholly inside a front garden avoids the licence, which is one reason the working area is agreed before the tower goes up.
How can we tell if our Edgware neighbour still uses a flue in the shared stack?
Ask them, then check the evidence. Pots with cowls or terminals, fresh staining at the top of the stack, a gas fire or stove on their side of the party wall, and brickwork that is warm when their heating runs all point to a live flue. On an Edgware semi, where the stacks of the pair are often built as one block, a smoke test by a chimney engineer settles it. The result goes to the structural engineer we appoint, because a live flue changes what can be removed.
Does taking the chimney stack down on an Edgware house need planning permission?
Check the address first. The national Planning Data service lists 16 conservation areas in the London Borough of Barnet, and inside one a stack seen from the street is part of the roofline the designation protects, so ask the council before it comes down. Outside a conservation area, removing a redundant stack from a house normally needs no planning application. West of the High Street, ask Harrow Council rather than Barnet. If the stack must stay, the breasts below come out on steel designed to carry it.
Can the bedroom chimney breast go in our Edgware house while the fireplace below stays?
Yes, but the fireplace below usually loses its flue. In a house built between 1919 and 1939, the flue from the ground floor fireplace rises through the bedroom breast, so removing that breast removes the flue too, and the fireplace downstairs becomes decorative unless a new flue route is designed. The masonry left above the bedroom, through the loft and out of the roof, still needs a beam or accepted brackets. 57% of Edgware homes were built in that period, so check which flue serves which room first.
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