Forest Hill's hillside villas have generous rooms, but a breast in a bay-fronted front room still eats the one wall you would put a piano or a bookcase against. Take it out and that wall is yours again. We appoint the structural engineer, install the beam carrying the stack above, and do the plastering ourselves.
Supporting the stack in Forest Hill terraces
In Forest Hill's terraces the chimney breasts sit against the party wall, with flues shared through it with the house next door. When we remove a breast at ground or first floor, the masonry stack above still needs carrying, and it must never be left hanging. We assess exactly what is above before any brickwork is cut, because a stack left unsupported is a serious hazard.
The usual solution is a pair of steel gallows brackets bolted firmly into the sound masonry of the party wall to catch the retained stack, or a beam where brackets are not suitable. On the taller SE23 houses where the stack runs full height and is redundant, we more often remove the whole stack and make the roof good with matching tiles and sound weatherproofing.
Party wall and building control in SE23
Because Forest Hill's terraces are built tight against each other, the chimney stack almost always sits within the shared party wall. Removing the breast or bolting gallows brackets into that wall affects your neighbour's structure, so the work is notifiable under the Party Wall Act and you serve notice before starting. It is a routine step, and you serve the notices as part of the job.
The structural support is notifiable under the Building Regulations, so Lewisham Council's building control inspects the brackets or beam and signs the work off; this internal work needs building control, not planning permission. We cap any redundant flue with ventilation to keep it dry, make good the floor and ceiling line, and replaster so there is no trace the breast was ever there.
Scaffolding and taking a stack down safely
If the stack is coming off the roof, the work happens outside as well as in, and that means scaffolding. On Forest Hill's steep streets a scaffold often has to be built off sloping ground or over a front lightwell, which takes longer to design and sometimes needs a licence from Lewisham Council where it stands on the pavement. A mobile tower is rarely enough for anything beyond the smallest stack.
The brickwork is then taken down by hand, course by course, and lowered rather than pushed in. Dropping a stack down the inside of the flue sounds quicker, but it fills the house with soot and can break through a ceiling below. Once the masonry is below roof level, the opening is framed, membraned and tiled from the scaffold while it is still standing, which is why the roofing follows straight on rather than waiting for a second visit.
- Ventilated caps and airbricks to disused flues
- Chimney breast removal on one floor or on every floor
- Building control notification and inspection sign-off
- Structural engineer's calculations arranged and followed
- Flue capping with ventilation to keep the stack dry
Trusted Chimney Breast Removal in Forest Hill
Forest Hill homeowners choose GS Renovation because we treat a chimney breast as the structural job it is. You get an engineer-checked support solution, gallows brackets or a beam properly fixed served on your neighbour and Lewisham building control handled end to end, plus tidy working and a fully replastered finish, backed by 30+ years across SE23.
- Waste cleared as we go, not left piled in the garden
- Building control applications and inspections coordinated for you
- Steel beam support used where gallows brackets are not suitable
- Founder-led team with 30+ years of hands-on experience
- Straight advice on what is and is not worth spending money on
- Hearth and floor structure reinstated where the breast is removed