Removing a chimney breast: the process from survey to sign-off
Taking out a chimney breast reclaims a surprising amount of space — but what stays above has to be properly carried. Here is the full process.
Deciding what comes out
Chimney breasts can be removed on the ground floor only, on the first floor, or full height. If the breast comes out but the chimney above stays, the remaining masonry has to be supported — usually on a steel beam designed by an engineer. Removing the stack entirely is simpler structurally but changes the roof and outside of the house.
Supporting what stays
Where a stack remains above a removed breast, gallows brackets were once common, but most building control bodies now expect engineer's calculations, and a steel beam is usually the most reliable support. The flue is capped and vented so the remaining stack stays dry and sound.
- Structural calculations for supporting the stack above
- Steel beam or other engineer-approved support installed
- Flue capped and ventilated
- Hearth removed and floor, wall and ceiling made good
Party walls and sign-off
In semis and terraces the chimney breast often sits on the party wall and may share a stack with next door, so a party wall notice is normally needed and the neighbour's flue must stay intact. The job finishes with a building control inspection and completion certificate.
Related questions
Do I need building regulations approval to remove a chimney breast?
Yes — it is a structural alteration, so it needs Building Regulations approval and support designed by an engineer, ending in a completion certificate.
Can I remove my breast if next door's chimney is still used?
Usually yes, provided their flue is left intact and the structure is properly supported. This is covered by the party wall notice served before work starts.
Ready to take it further? See our chimney breast removal service.