A redundant stack is a liability on a roof. It needs flashings that can fail, mortar that needs attention and a scaffold every time it is repaired. Some owners decide, after a survey, that the sensible thing is to take it down. That is a roofing job as much as a building one: the stack is dismantled, the hole it leaves is closed with the same covering as the rest of the slope, and the wall or breast below is dealt with so that nothing is left unsupported.
This guide describes the removal job: how a stack comes down below roof level, how the roof is patched, and the structural and party-wall questions to settle first. It does not cover the consent question in depth, which has its own page on whether you need permission to remove a chimney. If the stack is leaning, read why chimneys lean first, and for a stone stack see stone chimneys in Stroud. The full service is on our chimney repairs page.
Is the stack really redundant?
Before any removal is planned, someone has to be sure what the stack is serving. A fireplace you never light is the obvious case, but the flues in a stack can serve other things: a boiler in another room, a second fire in a neighbour's house, or a vent that keeps a roof void or breast dry. A stack that looks dead from the street may not be.
What we check on the survey
We look at the flues from the roof, and where we can from inside. We note how many there are, which rooms they run to and whether any show signs of recent use, such as soot staining on a pot or a flue liner in a modern state. The pots tell us something; so do the fireplaces below. If a gas appliance is connected to any flue, the flue is not redundant, and an engineer who is registered to work on that appliance needs to be involved before anything changes.
Shared and party stacks
On terraces and semis the stack often stands on the line between two houses, with flues from both. Taking the whole stack away affects the neighbour's fireplaces as well as yours. In that case the decision belongs to both of you, and the work is planned with the other owner's agreement in writing. Our guide to shared chimney stacks goes through the questions that arise.
Removal or repair
The honest comparison is between a rebuild and removal. If the stack is only serving as a feature, rebuilding it will cost scaffold, materials and lead for no practical gain. If it is a visible part of the street or the house is listed, removal may not be allowed at all. Both facts belong in the decision, and we lay them out with photographs of your own stack.
Taking the stack down to roof level or below
There are three common depths of removal. Each leaves a different job behind.
| Depth | What is taken away | What it leaves |
|---|---|---|
| Pots and top courses | Pots, flaunching and a few courses of masonry | A shortened stack that still needs flashing and capping |
| Down to roof level | Everything above the slope | Masonry flush with the roof, to be covered over |
| Below roof level | The stack and the part of the shaft inside the roof void | A gap in the roof and, possibly, a breast left in the rooms |
Reducing the height is a different and simpler job, covered in our guide to reducing a chimney's height. Full removal means working down to a point below the line of the roof, so that the slope can be reinstated without any masonry poking up through it.
How the demolition runs
The scaffold goes up first, with a platform at the stack and a chute or enclosed tube for debris. The pots come off, then the stack is taken down course by course, working from the top. Throwing masonry off the roof is not acceptable on a terraced street, and the chute keeps it away from the neighbours, the pavement and the slope itself. Bricks and stone are loaded into skips and taken away. If the units are sound and you want them, they can be stacked for reuse elsewhere on the house, which is useful if a matching repair is needed later.
The part below the roof line
Where the shaft passes through the loft, it is cut back to the level of the ceiling or the rafters, depending on the plan. Sometimes the stack is removed only to the loft floor, leaving the chimney breast intact in the rooms below. That is a sensible compromise: the roof is rid of the stack, and the fireplaces below are untouched. Taking the breast out as well is a bigger structural job, covered in the next sections.
Closing the hole: patching the roof where the stack stood
This is where a roofer's work counts most. A stack interrupts the roof covering, with flashings, soakers and a back gutter all fitted around it. Once the stack has gone, that whole arrangement must be taken apart and the slope made whole again.
Removing the old lead
The flashings, soakers and back gutter come off with the stack. They would be of no use on a continuous slope, so they are stripped back to the battens. The roof around the opening is then exposed, and any damage from years of leaks is plain to see, which is why the patching is done properly rather than bridged with a sheet.
Framing the gap
The opening in the roof was framed around the stack. Rafters were cut and trimmed to leave room for it. When the stack goes, timbers have to be fitted to carry the roof across the gap, so the covering has something to sit on. The size of the opening, and the condition of the timbers, decide how much carpentry is needed. If a rafter has rotted from long-term damp at the chimney, it is replaced.
Matching the covering
The slope is then re-covered. Underlay goes down, battens are fixed at the same gauge as the rest of the roof, and slates or tiles are laid to match. On a slate or clay tile roof, the job is to find a close match for colour and weathering. On a Cotswold stone roof, it means graded stone in the right diminishing course, as our guide to diminishing courses explains. Matching is where removal jobs are often disappointing, because a patch of fresh slates in a weathered slope is conspicuous. We set aside slates from low-profile areas of the roof for the patch where we can, and use new ones in the less visible spot.
A good chimney removal leaves a slope that looks as if the stack was never there. Ask to see the roof from the ground before the scaffold comes down.
Structure: weight, supports and the breast below
A chimney stack is heavy, and its weight goes somewhere. Understanding where is the first structural question.
What the stack was carrying
A stack that stands on a chimney breast carries its weight down through the breast to the foundations. Taking the stack away relieves that load. Nothing is destabilised by removing weight, but the roof timbers around the stack were framed to suit it, and the loft floor may have been trimmed around the breast. Those details are checked when the roof is opened up.
Removing the stack but keeping the breast
This is the simplest route. The breast stays, the fireplaces stay, and the only change is above them. The flues in the breast should be capped or ventilated afterwards, so that moisture does not collect in a flue that no longer has a pot and a cowl above it. Our guide on pots and cowls covers the ventilation of unused flues.
Removing the breast as well
If the breast is to come out of the rooms, the stack above it has to be supported or removed first. Cutting into a breast under a stack, without supporting what is above, is a serious structural risk, and it is why leaning stacks are found above taken-out breasts. A structural engineer should specify the supports, usually steel beams or gallows brackets, and building control needs to be informed. The stack above must be dealt with before the breast is touched, which is the order our guide to chimney breasts removed below explains in more detail.
We will tell you plainly if a job needs an engineer's input. Where a Building Regulations notification applies, we handle it, and the route in Stroud District is the Gloucestershire Building Control Partnership or a registered building control approver.
Neighbours, party stacks and the question of permission
Consent for removal is a separate question with its own page, so here is just the outline. Taking a stack off an ordinary house may not need planning permission if it does not materially affect the appearance of the building, but the stack is often a visible feature, and removing it can change how the house looks from the road. On a listed house, Stroud District Council says full legal protection covers every part, whatever the grade, so listed building consent is the starting point. Stroud District has 41 conservation areas, with Article 4 Directions in five of them, and the council has not said whether those reach roofs and chimneys, so ask its planning team.
The party-wall question
Where the stack sits on the line between two houses, the work affects the neighbour's property. Removal can disturb their flues, their brickwork or the shared roof junction. There are legal rules about work to a party wall, and we do not give legal advice on them. A chartered surveyor, or your building control body, is the right source on whether they apply to your job. What we can do is plan the sequence so that the neighbour's side is protected, and tell you early if the work looks likely to touch it.
Talking to the neighbour
Even where no formal procedure applies, a conversation helps. The scaffold, the dust, the chute and the noise all affect the next-door house. Giving the neighbour the dates and the reason avoids complaints, and it often prompts them to mention a flue of their own that nobody knew was in use.
For a fuller treatment of consent, see our answer on permission to remove a chimney.
Cost, scaffold and what a removal quote lists
What a stack costs to take down depends on its height, whether it is shared, and the carpentry and covering repair that follow, so we price it only once the survey has shown what is involved. Published guides do price the pieces. Scaffold is the biggest: about £1,125 for a re-roof in MyBuilder's 2026 guide, £700 to £1,300 in Checkatrade's October 2026 guide. One stack needs less than a full-house frame, but it still needs a platform and a debris chute either way, and on a steep Stroud street the scaffold may be harder to erect than it looks from the map.
What changes the price
Height, size and the material of the stack matter. A tall stone stack with several flues is more work than a short brick one. The depth of removal matters, as does the covering the roof must be patched with, since stone and slate cost more than concrete tile. Whether the breast is coming out of the rooms is the biggest single variable, because that brings in an engineer, steelwork and building control.
The written quote
After the survey, the quote covers the whole job: scaffold, demolition, roof carpentry, the patch of covering, any work in the loft and rooms, waste and clearance. Survey photographs of your stack accompany it. Your quote shows VAT.
The roof is left weathertight, you are left with a clear site, as the waste is taken off. The work carries our 10-year workmanship guarantee, in writing. If you want to know whether removal is the right choice for your stack, send us a photograph from the ground, and tell us whether the stack is shared and whether any flue is still in use.