Chimney breast removal and the Party Wall Act

Chimney breast removal is one of the most common reasons homeowners in Victorian and Edwardian terraces and semis come to us. It is also one of the jobs most often done badly: breasts taken out with no notice, the stack left hanging on nothing more than the brickwork above, and the neighbour discovering cracks or a blocked flue months later. This guide explains how the Act applies, what a surveyor checks, and how to get it right first time.

Why chimney breast removal is notifiable

In most terraced and semi-detached houses the chimney breasts are bonded into the party wall. Very often the breast on your side backs directly onto a matching breast and flues on the neighbour’s side, with only a half-brick “withe” separating the flues. The breast is therefore part of the party structure, not a free-standing feature you own outright.

Section 2(2)(g) gives a building owner the right “to cut away from a party wall … any footing or any projecting chimney breast, jamb or flue, or other projection on or over the land of the building owner”. Because it is a section 2 right, section 3(1) requires a party structure notice before you exercise it. The government’s explanatory booklet specifically gives removing a chimney breast as an example of cutting off projections from a party wall.

Associated works are frequently notifiable in their own right too:

• Cutting in for supports such as steel beams, padstones or brackets: section 2(2)(f), cutting into a party structure for any purpose.
• Removing the stack above roof level where it forms part of the party wall: again section 2(2)(g) or, if demolished and rebuilt, section 2(2)(e).
• Removing only the ground-floor breast while leaving the first-floor breast and stack in place: still section 2(2)(g), and the support for what remains becomes the central technical issue.

Notice requirements and timings

A party structure notice must state your name and address, the nature and particulars of the work, and the date it will begin (s.3(1)). It must be served at least two months before that date (s.3(2)(a)) and lapses if the work has not begun within twelve months and is not prosecuted with due diligence (s.3(2)(b)). Your neighbour has 14 days to consent in writing; silence is a deemed dispute under section 5.

Work can start earlier than two months if the adjoining owner agrees in writing (s.3(3)(a)), but they are under no obligation to do so. Serve every owner of the adjoining property, which includes a leaseholder with more than a year left on their lease as well as the freeholder. If the house next door has been converted into flats, more than one owner may be affected.

What a surveyor actually looks at

When I inspect a chimney breast removal, the questions are practical rather than legal:

• What stays and what goes. Full removal from ground to roof, including the stack, is structurally the simplest. Partial removal leaves brickwork above that must be carried by something.
• The support design. Remaining breasts and stacks should be supported on a properly designed steel, usually bearing into the party wall and sometimes the front or rear wall, with padstones sized by a structural engineer. Many building control bodies will no longer accept traditional gallows brackets without an engineer’s justification, so expect calculations, although what is acceptable depends on the party wall structure and the size of the remaining chimney stack.
• The neighbour’s flues. Is next door’s fireplace, stove or boiler flue still in use? Cutting into the shared flue structure can open voids, let smoke or fumes into the wrong house, or allow debris to drop and block a live flue. An Award will usually require the flue to be checked and, if necessary, smoke tested afterwards.
• Wall thickness after removal. Removing the breast can leave the party wall locally thin, especially where the flues were “gathered” into the wall. Exposed flue voids should be infilled or bricked up, and the face made good so the wall retains its fire separation and sound performance.
• Vibration and method. Breasts should be taken down by hand, from the top down, with temporary propping where anything above is retained. Heavy breakers on a party wall are a common cause of cracking next door.
• Debris. Rubble falling inside the flue can land in the neighbour’s hearth. Sealing or protecting their opening before work starts is a standard requirement.

Building regulations and other permissions

The Party Wall Act does not replace building regulations. Removing a chimney breast is structural work, so you will normally need building control approval (local authority or a registered building control approver), and that body will want the engineer’s design for any retained stack. Removing a stack visible from the street may need planning permission in a conservation area or on a listed building. See our guide to party wall, planning and building regulations for how the three regimes fit together.

If you own a leasehold flat, check your lease: chimney breasts are often part of the structure retained by the freeholder, and you may need the freeholder’s licence as well as party wall notice. Our guide to party walls and flats covers this.

Common problems we see

• Retrospective discovery. A buyer’s surveyor finds that a breast has been removed with no visible support, no building control sign-off and no party wall paperwork. This can delay a sale and lead to remedial steelwork. See selling during party wall works.
• Cracking next door. Hairline cracks around the neighbour’s own breast or ceiling junction are the most common complaint. Without a Schedule of Condition it is hard to prove whether they are new.
• Hearth and flue damage. Debris in the neighbour’s flue, or a damaged liner, can make an appliance unsafe to use.
• Starting before the notice expires. Builders often want to strip out chimney breasts early in a project. Plan the notice into the programme. See what happens if you start without notice.

Checklist for building owners

• Confirm with your designer whether the breast is in the party wall (it almost always is in a terrace or semi).
• Get a structural engineer’s design for any retained breast or stack before serving notice, and include it with the notice.
• Serve a section 3 notice on every adjoining owner at least two months before you need the work done.
• Ask the neighbour whether they use their flue, and record the answer.
• Arrange a Schedule of Condition of the neighbour’s adjoining rooms, especially the chimney breast and ceilings.
• Apply for building regulations approval in parallel.
• Tell your builder that work to the breast cannot start until consent or an Award is in place.

Worked example (illustrative)

This example is illustrative only, to show how the process typically works. It is not a real case.

A homeowner in a 1900s mid-terrace wants to remove the ground-floor chimney breast in the back reception to create an open-plan kitchen, keeping the first-floor breast and the stack. The engineer designs a steel beam bearing into the party wall on a padstone at one end and the spine wall at the other. One party structure notice is served on the neighbour describing (1) cutting away the ground-floor breast under section 2(2)(g) and (2) cutting into the party wall for the beam bearing under section 2(2)(f), with the engineer’s drawing attached. The neighbour consents on the condition that a Schedule of Condition is taken first. The Schedule records an existing hairline crack above their own back-room fireplace. After the work, a further hairline crack appears near the ceiling; because the record shows the earlier crack was already there, both owners can see clearly what is new. The builder fills and redecorates the new crack under section 2(5), and the neighbour’s flue is checked and found clear.

At a glance

Costs with us

Our fixed fees for domestic work are below. The neighbour’s surveyor, if they appoint their own, is normally paid by the building owner under section 10(13).

Domestic extensions and loft conversions. Fixed fees, invoiced on completion; we take enquiries only, with no online payment. If your neighbour appoints their own surveyor, the building owner normally pays that surveyor’s reasonable fees as well (s.10(13)), and those are set by that surveyor, not by us.

Sources and further reading

• Party Wall etc. Act 1996, section 2: Repair etc. of party wall: rights of owner (legislation.gov.uk)
• Party Wall etc. Act 1996, section 3: Party structure notices (legislation.gov.uk)
• Party Wall etc. Act 1996, section 5: Disputes arising under sections 3 and 4 (legislation.gov.uk)
• Party Wall etc. Act 1996, section 10: Resolution of disputes (legislation.gov.uk)
• Party Wall etc. Act 1996, section 11: Expenses (legislation.gov.uk)
• The Party Wall etc. Act 1996: explanatory booklet (GOV.UK)

This guide is general information on the law in England and Wales, written from our surveyors’ practical experience. It is not legal advice; for a specific dispute, take advice on your own facts.

Sources: Party Wall etc. Act 1996 (legislation.gov.uk) · The Party Wall etc. Act 1996: explanatory booklet (GOV.UK). Last reviewed 27 October 2026. General guidance on the law in England and Wales, not legal advice.