People ask about removing a chimney for a handful of reasons. The flue is never used, the stack leans, the repair bill keeps coming back, or the stack is simply in the way of a loft conversion or a solar array. Bringing down the brickwork above the roof is a real option, and often a sensible one, but it is not as simple as knocking bricks off and tiling over the hole.
As part of our chimney repairs work, three questions decide how the job goes: what holds the stack up, which rules apply to the work, and who else has an interest, such as a neighbour who shares the stack. This guide takes them in that order. If you only want to know whether permission is needed, our shorter answer on permission to remove a chimney covers the headline points. If the stack is leaning and you are weighing up options, read about leaning chimneys alongside this page.
Stack, breast and flue: three different jobs
The word chimney covers three separate things, and the rules differ between them. The stack is the brickwork you see above the roof. The breast is the brickwork inside the house that carries the flues up from the fireplace. The flue is the passage for smoke and gases. Removing the stack above the roof is not the same as removing the breast in a bedroom, and a quote that does not say which one is meant is not much use.
The Planning Portal's FAQ says Building Regulations approval always applies to removing a chimney breast, as breasts are structural, and adds that rules may differ for removing the stack. We read that as a prompt to ask rather than assume. Which category your work falls into should be put to your building control body before you commit.
Taking down the stack alone
When only the part above the roof comes down, the breast below stays in place and keeps carrying the lower flues. The roof is the main thing that changes: a hole is left where the stack passed through, and the structure around it has to be made weathertight and sound.
Taking out the breast as well
If the breast is to go too, the removal is bigger and the structural questions multiply. Our answer on a chimney breast that has already been removed explains how a stack is supported when the breast below has gone.
Why remove a stack above the roof
The commonest reason is that the stack costs more to keep than it is worth. A stack with no flue in use still needs pointing, flashings and a mortar cap, and the junction with the slope is a regular source of leaks. Taking the stack away removes that junction altogether.
Other reasons are practical. A leaning stack over a weak breast can be a risk to the roof timbers. Loft conversions and extensions sometimes need the stack out of the way. A badly maintained stack on a shared roofline can also upset neighbours if pieces fall.
There is a case against removal as well. A stack is part of the look of a house, and on a terrace or in a conservation area, losing it alters the skyline of the terrace and how the street reads. If the flues below are still in use for a fire or a boiler, the stack cannot simply come away without a replacement outlet. We say plainly which route fits your house.
A repair that properly solves the fault is cheaper than a removal if the stack is sound. Taking a stack down only makes sense when the flues below are finished with.
Structural advice before anything comes down
A chimney stack is heavy and its weight does not vanish when the top comes off. What matters is what is underneath. If the breast is intact from fireplace to roof, the stack above can be taken down in courses without affecting anything below. If an earlier owner removed part of the breast in a lounge or bedroom, the stack may be sitting on steelwork or gallows brackets, or on very little at all.
The Planning Portal advises seeking a structural engineer's advice when removing chimney breasts. For stack removal we apply the same caution: if there is any doubt about what supports the stack, get a structural opinion before the scaffold goes up. Loft photographs help a great deal at that stage. They show the breast where it passes through the roof space, any earlier alterations and the state of the timbers around it.
What an engineer looks at
The engineer works out whether the remaining structure copes with the change in load, whether the roof timbers around the old stack need strengthening, and whether anything needs to stay in place to keep a neighbouring flue stable. Their report also gives building control something to approve. We can meet an engineer on site and take the survey photographs they need.
Building Regulations and who signs it off
Whether your particular job needs a Building Regulations application is a question for your building control body. In England that means your council's own team or a registered building control approver, the private route in force since 6 April 2024. Swindon Borough Council runs its own building control team, based at Wat Tyler House in Swindon. Outside the borough the route differs. For Wiltshire addresses, speak to Wiltshire Council's building control team.
We explain the consent your job needs, and when notification is required we submit it for you. Where an engineer is involved, their report goes in with the application.
Making good the roof
Once the stack is gone, the roof covering has to be reinstated across the gap. On a slate or clay tile roof, that means new rafter or batten work to close the hole, underlay lapped properly, and slates or tiles of the right type laid in. Where the old flashings are removed, the adjoining courses are dressed so that no joint is left. Matching old slates or tiles is usually achievable from the stack's own surround or from reclaimed stock.
Structural and fire-related points are noted by building control at inspection. We keep photographs of each stage of the work so there is a record.
Party walls and shared stacks
If your stack sits on a wall shared with a neighbour, removal is where the Party Wall etc. Act 1996 comes in. Under the GOV.UK guide, taking chimneys out of a party wall is work your neighbour must be told about, as is cutting into the wall. Your neighbour should receive notice no sooner than a year before the start and no later than two months before it. The neighbour must respond in writing within 14 days if they consent, and GOV.UK states you cannot assume that no response means they agree.
The Act itself describes the right to cut away a projecting chimney breast, jamb or flue from a party wall, and requires a party structure notice to be served at least two months before the work begins, unless both owners and occupiers agree in writing to an earlier start.
Neighbours matter in practical ways too. If their flue shares the stack, taking it down affects them directly. They may need their own flue treated, or the stack reduced and capped rather than removed. Where that applies, it is raised at the survey instead of on the day. This is general information, not legal advice; a party wall surveyor or solicitor can confirm how the Act applies to your house.
A word on timing
The notice period means a stack removal on a shared wall cannot normally be rushed. If a stack is unsafe, a make-safe, such as taking down only the dangerous part, can be arranged separately while the formal process runs.
Planning, listed buildings and conservation areas
Planning is a separate question from Building Regulations. The permitted development rules for roof alterations explicitly exclude the installation, alteration or replacement of a chimney, flue or soil and vent pipe from their scope, so we do not assume that removing a stack is automatically allowed. For a house in an ordinary street, ask Swindon Borough Council's planning team, which encourages pre-application advice.
Listed buildings are stricter. On a listed house, any work touching its special character needs consent, and taking off a stack is very likely to count. In Swindon, the Railway Village cottages were statutorily listed in 1970, and the area has an Article 4 direction adopted in 1980. Swindon's appraisal adds that aerials and dishes fixed to chimneys or roofs in that area are resisted and need planning permission, with listed building consent added where necessary. Removing a stack in that area is a matter for the council before any work starts.
Conservation areas follow the same principle. If your house is in one, put the question to the council's planning team before booking anything.
For Railway Village background, see Railway Village roofs. For the Planning Portal's own wording on chimney breasts, their FAQ is a good starting point.
How the stack is taken down and the flues left behind
Once permissions and structural points are settled, the work itself is quite orderly. Scaffold gives a safe platform at chimney height and a protected route for waste. The pots come off first, followed by the flaunching and then the brickwork in courses, taken down by hand to the level agreed with the engineer or building control. Bricks are lowered in bags or chutes, never dropped, and the waste is taken away at the end.
The flues beneath the new roofline cannot just be left open to the weather. Each flue is either capped with a ventilated terminal that lets the passage breathe, or closed off in the way your building control body requires. A flue sealed with no ventilation at all tends to produce damp patches on the chimney breast below, as our wider guidance on disused chimneys explains.
Where the stack met an older wall or a neighbouring stack, the adjoining brick often needs repointing. On an older house that is best done in a mortar suited to the brick; our page on lime mortar for old chimneys sets out when that matters. If the stack was showing signs of age and you have not yet decided between removing and rebuilding, our page on chimney stack rebuild compares the two.
The roof reinstatement is covered by our written 10-year workmanship guarantee.