Chimney Breast Removal Streatham

An Edwardian breast in Streatham is typically 1.2 metres wide and projects 350mm, so losing it across two floors gives back close to a square metre of usable room. That is a shower enclosure, or a proper wardrobe. The stack above comes onto a steel beam, sized by the engineer and inspected by building control.

In Streatham, 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 Streatham.

How the job runs

1. Free site survey at your Streatham 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 Lambeth 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.

Removing a chimney breast in Streatham

Most Streatham terraces still carry their original breasts in the reception rooms and bedrooms, eating into space that could be better used. Because the breast helps carry the masonry and the stack above it, removing the lower section leaves weight that has to be caught somewhere. We never take a breast out without first understanding what sits over it, so every job starts with a structural engineer looking at the whole stack from ground floor to roof.

Where you keep the upper breast or the roof-level stack, the retained masonry is carried on a steel beam on padstones, designed by the engineer we appoint; gallows brackets are used only where the engineer and building control accept them. Where the stack is redundant top to bottom, we often remove the whole thing and make the roof good with new rafters, felt, battens and matching tiles, which gives you the cleanest result and no support left carrying dead weight.

Housing in Streatham

Roughly 27,640 dwellings sit on the valuation list for Streatham. 33% are houses and 67% flats, and by age 43% predate 1919, 27% are interwar and 29% post-war. Where most homes are flats, a chimney breast in a flat in Streatham often supports the breasts in the flats above, so removal needs the freeholder's licence and designed support.

Chimney stacks inside Streatham's conservation areas

Lambeth changed the boundary of its Streatham High Road and Streatham Hill conservation area (CA 54) in January 2024. That is the practical point for a chimney job. A house that sat outside the area when you bought it may now be inside, and a stack that once came down without a second thought may now raise a planning question. Check the current boundary map for your address before designing the work, not the one in your purchase survey. The breast inside the room is a building control matter wherever the house is.

Inside a conservation area, removing only the breast and keeping the stack is the route that leaves the street view untouched. The stack is then carried on steel designed by the structural engineer we appoint, and building control inspects that support before the breast below is cut out. If you want the stack gone as well, pre-application advice for a house or flat in a conservation area is charged at Lambeth's higher householder rate. Make it count by asking one clear question, with photographs of the roofline from the street and from the rear gardens.

Party wall and building control in SW16

In Streatham's terraces the chimney stack sits within the party wall shared with the house next door, so removing a breast or bearing a beam into that wall is notifiable under the Party Wall Act. You serve notice on your neighbour as building owner before work starts, using the drawings we give you, and keep them informed, which matters when both houses share the same flue structure and the same masonry.

The structural support itself is notifiable under the Building Regulations, and Lambeth Council's building control signs it off, so no planning permission is involved for this internal work, though a listed home needs listed building consent. We handle it end to end: appointing the engineer, safe removal with propping, capping and ventilating any redundant flue to keep damp out, and replastering so the wall looks like the breast was never there.

Sign-off when a whole stack goes

Where the entire stack comes out of a Streatham house rather than a single breast, what Lambeth's inspector looks at shifts upwards. The support question largely disappears, since there is nothing left above to carry. The interest moves instead to the roof: how the opening left by the stack has been framed and tiled, whether the covering is properly closed and weathered, and whether anything the stack was steadying has been dealt with.

That last point catches people out. In some Edwardian roofs a purlin or a rafter takes support from the stack, and removing it leaves a spread that shows up as a dip in the roof line a year later. The inspector will ask about it and so should you. Inside, they still want to see how floors and ceilings were trimmed where the breast passed through them, before any of that gets covered up. Scaffold for the roof work is factored into the programme early, as it usually needs booking further ahead than the steel does.

• Structural engineer's calculations arranged and followed
• Bedroom breast removal to reclaim usable floor space
• Fireplace opening infill and new plasterboard finish

VOA Council Tax stock of properties, March 2025, for all 7 statistical areas in Streatham. Counts rounded by the VOA.

Work in Streatham rarely sits on its own, so you may also want home renovation in Streatham, chimney breast removal across Lambeth, builders across London, party walls and chimney breasts, our London chimney breast removal page and Building Regulations Explained.

The GS Renovation Difference in Streatham

Streatham homeowners choose GS Renovation because we treat chimney breast removal as the structural job it is. You get a support designed by the engineer we appoint, usually a steel beam on padstones, fixed properly, Lambeth building control inspections booked for you, tidy working in an occupied home and a result signed off by building control, backed by our founder's 30+ years on the tools.

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.