Take out a shared chimney breast with next door’s side protected

Blueprint of a party wall with the ground-floor chimney breast marked for removal, a new steel beam and props holding up the stack above

For homeowners in England and Wales taking out a chimney breast on a shared wall. Compare quotes from party wall surveyors who protect the neighbour’s side while your engineer designs the support.

In a terraced or semi-detached house the chimney breast is often part of the wall you share with next door, and the stack above may serve both homes. Taking it out can mean cutting into the party wall, changing how the stack is supported and repairing the neighbour’s side. In England and Wales that can bring in the Party Wall etc. Act 1996 and a party structure notice (the notice for work to a shared wall), served at least two months before work starts. The removal must be designed by a qualified structural engineer before anything is taken out, so the chimney above stays supported. A party wall surveyor handles the notice, records the neighbour’s rooms and agrees an award, which is the written terms for the work.

How a professional can help

Deciding if the Act applies: Whether removal needs notice depends on how the breast is built and what is cut. A party wall surveyor reads your engineer’s drawings and tells you where you stand.
Support for the stack above: If the stack above is kept, it must be supported once the breast below is gone, for example by steel designed by your engineer. The notice and award describe it so the neighbour’s surveyor can see how both sides stay safe.
Back-to-back chimney breasts: Many terraced houses have matching breasts on the same wall. The surveyors check how the two are tied together, so taking out yours does not leave the neighbour’s breast unsupported or cracked.
Recording the neighbour’s rooms: Photographing and noting the neighbour’s walls, ceilings and decoration on the other side, so any dust, cracks or marks can later be compared with a clear record.
Dust sheets, noise and repairs: The award covers working hours, dust sheeting, noise from breaking out, and plastering or repair of the neighbour’s wall if it is disturbed.
If your neighbour is the one removing theirs: A surveyor can read the notice you have received, check that your flues, chimney breast and side of the wall are protected, and act for you if you do not agree with the proposal.

Is this right for you?

You want more floor space or a bigger room, and a chimney breast stands in the way on the wall you share with next door.
The stack above your chimney breast is shared with next door and you are not sure what removal affects.
You are removing a chimney breast as part of a larger renovation or loft conversion.
Your builder has asked whether a notice needs to be served.

How the project usually runs

Support designed first: A structural engineer inspects the chimney and designs the support for the stack and any wall above, before any removal begins. The notice can then describe the work accurately.
Party structure notice: The notice goes to the neighbour with the engineer’s drawings, showing the chimney breast, any shared flues and how the stack above will be supported. It must be served at least two months before work on the shared wall starts.
Neighbour responds: The neighbour can consent. If they object (dissent) or do not reply within 14 days, surveyors are appointed and agree an award, including how shared flues are dealt with and who pays for repairs on their side.
Record, support, remove: A schedule of condition covers the neighbour’s side. The builder then installs the support, takes the breast out in stages and repairs the wall, following the award.
Inspect and sign off: Once the work is finished, the surveyors can revisit next door and settle any making good, while building control inspects the structural support.

What affects the cost

Whether the chimney breast, the stack above or both are being removed.
How the support for the stack is designed, and whether the neighbour also has a chimney breast on the same wall.
Whether the neighbour consents quickly, or an award has to be settled before the stack can be touched.
How many of the neighbour’s rooms on that wall need recording, on each floor.
Whether this is a stand-alone job or part of a larger scheme sharing the same notice.

Party wall rights, Building Regulations and the Act

The Party Wall etc. Act 1996 covers shared chimney breasts in England and Wales. Scotland and Northern Ireland have different rules, though party wall surveyors work across the UK.
Removing a chimney breast is structural work. Building control normally needs the engineer’s calculations and drawings, and in Scotland the equivalent is a building warrant.
Party wall rights are separate from Building Regulations and planning. A listed building may also need listed building consent.
Flues in a shared stack may serve a boiler or fire in either house. Check what each one serves before anything is removed.

Questions people ask

Do I need a party wall notice to remove a chimney breast?

It depends. If the breast is part of a wall you share and the work cuts into or changes that wall, notice is often needed in England and Wales. If the breast is on a wall you do not share with anyone, it may not be. A surveyor can confirm.

What holds up the chimney stack afterwards?

When the breast below is removed and the stack above is kept, the stack needs new support, such as a steel beam or bracket, designed by a structural engineer. It must not be left unsupported, which is why the design comes before any removal.

What about my neighbour’s fireplace and flues?

Their flues may share your stack, and they must not be blocked or damaged. The surveyors and engineer check what is shared, the award can require protection and repair, and any leftover flues should be ventilated as your engineer advises.

Can I remove only part of the chimney breast?

Partial removal is possible, for example removing the breast in one room and leaving the stack in the loft, but each version needs its own support design. The extent of removal also affects what the notice has to say.

Can the work be combined with my loft conversion?

Often, yes. One notice can describe every cut into the shared wall, such as the chimney breast and loft steel. That saves time, but the engineer should design the whole sequence so the stack and floors are supported in the right order.

Available across the UK

Party wall surveyors cover the whole of the UK. The Party Wall etc. Act 1996 applies in England and Wales; Scotland and Northern Ireland have different rules, and a professional can tell you what applies to your property.