The short answer
Repair a chimney that is sound, visible from the street, listed, or shared with a neighbour. Consider removal when the stack is unused, the masonry is failing and a rebuild would cost more than it is worth. Removing a stack above the roof is often simpler than taking out the breast inside, and both need checking against planning and building rules before any work starts.
Start with what the stack is doing for the house
A chimney is more than a way out for smoke. The stack above the roof is the visible part. Below it, the breast runs down through the rooms, and in many houses it carries load from floors, or braces a gable wall, or serves flues from a neighbouring room. Before choosing between repair and removal, find out what it is holding up and who else relies on it.
Ask four questions. Is the flue still wanted for a stove, a boiler or an open fire? Is the stack shared with next door? Is the house listed or in the Bath conservation area? And what is the stack's condition today? The answers do most of the deciding.
A chimney on the street elevation of a Georgian terrace is part of the roofline, and removing it changes how the building reads. A rear stack tucked behind a parapet wall is a different case. Both of those are decisions for a conversation with the council before anyone books a scaffold.
When repair is the better route
Repair makes sense when the problem is local and the stack is basically sound. Failed lead flashings, eroded pointing, cracked flaunching and a broken pot are all routine repairs that restore a stack to full weathertightness. Each is a fraction of the cost of rebuilding, and none changes the look of the house.
Repair is also the right choice where the stack is listed or visible, where it is shared, or where you might want the fireplace back one day. A repaired stack preserves the original roof, which suits how we work, and it keeps your options open. A listed building needs consent before a stack is altered or taken down, and consent for removal is not something to expect.
Look at the pointing. If the masonry is hard and sound and only the joints have eroded, repointing is enough. For Bath stone the mortar is lime and never cement; the reasons are in cement on Bath stone. Where the lime work is the main job, lime repointing of chimneys explains the method.
When removal starts to make sense
Removal is worth considering when the stack serves nothing, and keeping it going would mean paying for repairs to a structure that has no use. The case gets stronger if the masonry is spalling, the stack leans, or the same leak keeps coming back through joints that are past repointing.
It can also make sense where a stack above the roof is unused and its weight is a worry. A tall stack carries a lot of masonry on a roof structure that was not designed with it in mind, and an unused one gives nothing back. Taking it down below the roof line and closing the roof properly can end a recurring maintenance cost and a risk.
Removal has its own costs. The roof has to be repaired where the stack stood, which means new rafters or trimmers where needed, new covering, and a proper junction with any party wall. The flue also needs to be dealt with, since a sealed flue left without ventilation can cause damp. Our page on chimney stack removal sets out the work involved.
Removing the stack versus the whole breast
Taking the stack down above the roof and removing the breast inside the house are two separate jobs. The first is roof work. The second is structural, because the breast may support the floors above or the wall alongside it, and the rooms it passes through will need to be altered and decorated.
If the aim is simply to stop a leak from an unused stack, taking it down to the roof and capping the roof properly is much less disruptive than removing the breast. You keep the chimney breast inside, and no structural change is needed to the rooms. The flue can be capped and ventilated so that the breast stays dry.
If you are thinking of removing the breast as well, the rules are different. Our answer on Building Regulations for breast removal sets out what to check, and a structural engineer should be involved before work begins.
The planning question comes first
Whether you may remove a stack at all is not a given. In Bath, the whole city is a World Heritage Site, and the conservation area covers about half of it. If the house is listed, B&NES must give consent before a stack is altered, and some streets have Article 4 directions that withdraw certain rights. We cannot give you legal advice on any of this, so check with B&NES planning at the start. We explain the position in planning permission to remove a chimney.
Ask first and build afterwards. Carrying out such work unconsented is a criminal matter, and a removal made without it can leave you facing an order to put the stack back.
Weighing up the cost of each route
These typical UK ranges come from MyBuilder's chimney repair cost guide (2026) and are not Empire prices. Repairing a stack typically costs £500 to £2,000, with repointing averaging about £750 of that. A full stack rebuild is typically £2,000 to £10,000 or more. The guide shows how access drives small jobs: a simple patch costs about £250 without scaffold and £550 to £650 with it.
Removal is not free either. It involves scaffold, labour to take the stack down by hand and lower the masonry, making good the roof, and taking the waste away. For a stack that would otherwise need a rebuild, removal can come out cheaper than the repair. For one that needs only repointing and a new flashing, repair is usually the lower cost.
The way to compare is to get both options priced against the same survey. The survey costs nothing and we photograph the stack, then send a fixed written price, which lets you set a repair against a removal on the same facts. Repair comes first with us, but where removal is the sound choice for your stack, we will tell you. Before you decide, read about the causes of stack leaks in why is my chimney leaking.
Our chimney repairs hub lists the other stack questions we answer.
