Chimney Breast Removal Barnet

Once a Barnet chimney comes down, what happens to the flue decides whether the finish lasts. We cap the head, fit a vent at low level, and only then reinstate and plaster. Support above is a steel beam sized by the structural engineer we appoint, set on padstones and checked by the building inspector.

In Barnet, 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 Barnet.

How the job runs

1. Free site survey at your Barnet address: which floors the breast runs through, a shared stack, any live flue.
2. 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.
3. The floor above is propped and the breast comes down in courses from the top; what remains sits on the support the engineer specified.
4. Building control inspects the support before it is covered. We make good, and the completion certificate follows.

Chimney breasts in Barnet's interwar houses

Most Barnet semis were built with a chimney breast on the party wall serving the front and rear rooms, and that breast helps carry the masonry and stack above it. Homeowners in Finchley and Edgware often want the breast gone to reclaim floor space in a bedroom or reception room, but the flue and stack overhead still have to be supported once the brickwork below is removed.

Where we take out a breast on the lower floors and leave the stack above, we support the retained masonry on a steel beam bearing on padstones, or on gallows brackets only where the engineer and building control accept them. In many Barnet houses the whole stack is now redundant, so removing it entirely and making the roof good is often the cleaner solution. A stack is never left unsupported.

Housing in Barnet

The valuation list shows roughly 160,480 homes in Barnet, of which 20% are pre-1919, 34% interwar and 46% post-1945, split 50% flats to 50% houses. Many homes here are flats, and a chimney breast in a flat in Barnet often supports the breasts in the flats above, so removal needs the freeholder's licence and designed support.

Chimney stacks on Barnet terraces and on The Burroughs

18% of Barnet's homes are terraced houses and 30% are semi-detached or detached, and the chimney question is different in each. In a terrace or a semi, the stack on a party wall often carries flues from both houses, so taking your breast out still leaves next door's flues in the same brickwork. The engineer designs support for masonry that is not yours alone, and the building owner serves party wall notice before it is cut. A detached house has no such neighbour: once every flue is confirmed redundant, the whole stack can come down from the roof in one sequence, which leaves nothing above the removed breasts to carry and nothing to maintain.

Above the roofline, planning can matter as well. Hendon The Burroughs Conservation Area was designated on 27 July 1983, and its Article 4 direction, which covers the houses at 1-8 Burroughs Gardens and 63-77 (odd) The Burroughs, removes permitted development rights for other roof alterations. On those houses, taking a stack down or cutting it below the ridge can be a planning question, so ask Barnet Council before the scaffold is booked. Keeping the stack and removing only the breasts inside avoids that question, and the engineer then designs the steel to hold the retained stack in place.

Party wall notices for Barnet chimney work

In the typical Barnet semi the chimney stack sits within the party wall shared with the house next door, so removing the breast or seating steel in that wall is notifiable under the Party Wall Act. You serve notice on your neighbour as building owner before work starts, with the drawings we supply. The structural support itself is a Building Regulations matter, and Barnet Council building control signs it off, not the planning department.

Once the brickwork is out we cap any redundant flue and ventilate it to prevent damp, then reinstate the floor, walls and skirting so there is no trace the breast was ever there. Because these houses are lived in throughout, we sheet the work area, control the dust from cutting old lime mortar, and clear away the masonry rather than leaving it stacked in the garden.

Faults we find before the breast comes down

Three things commonly go wrong on a Barnet chimney job, and all three are found by looking first. The first is a stack already leaning or cracked at roof level, in which case supporting the base solves nothing and the head needs rebuilding in the same visit. The second is a flue still serving a neighbour's appliance or an open fire, which cannot simply be sealed up and forgotten. Both change the scope, and both are cheaper to find early.

The third is soot. An interwar flue that burned coal for forty years holds a surprising quantity of it, and opening the breast without sealing the room spreads fine black dust through the whole house. We bag the flue high up, bring the soot down in a controlled way and remove it before the brickwork starts. Doing these checks at survey stage is why a price quoted in Finchley or Mill Hill tends to hold to the end.

• Structural engineer's calculations arranged and followed
• Loft inspection of the retained stack before work starts
• Roof tiling, flashing and leadwork made good

VOA Council Tax stock of properties, March 2025, for all 42 statistical areas in Barnet. Counts rounded by the VOA.

If you are weighing up chimney breast removal in Barnet, it may help to read home renovation in Barnet, our Barnet area guide, builders in Barnet, the Party Wall Act for a breast in a shared wall, chimney breast removal across London and Building Regulations Explained.

The GS Renovation Difference in Barnet

Barnet homeowners choose GS Renovation because chimney breast removal is structural work and we treat it that way. You get support designed by the structural engineer we appoint, usually a steel beam on padstones, with gallows brackets only where the engineer and building control accept them. We handle Barnet Council building control, keep the dust controlled in your occupied home and leave a fully finished room, backed by our founder's 30+ years on the tools.

Reviewed jobs near Barnet

2 MyBuilder reviews from Barnet, with each customer's own job title:

• Install new kitchen, Barnet, 15 Apr 2022 (5 out of 5)
• Bathroom Refurbishment, Barnet, 14 Oct 2021 (5 out of 5)

Read all 31 on our reviews page.

Checked by Abdelaaziz Saaid, founder and director of GS Renovation Ltd (Companies House no. 14611254). Structural design is by the consulting engineer appointed to your project.