Chimney work is priced by the stack, not by the hour, and two stacks that look alike from the road can sit hundreds of pounds apart once someone has been up to look. The cost depends on what has failed, how high the stack is, how the roof is reached and whether the brick behind the mortar is still good. This page lays out the typical UK ranges reported by cost guides for the common jobs, explains what pushes a quote up or down, and describes how we build a fixed price after a survey, so you know what you are being asked to pay for.
The ranges, and where they come from
Every figure below comes from a third-party UK cost guide. Several are published by lead-generation or trade sites, so treat them as a picture of the market, not a Beacon price list. Your fixed quote follows the survey.
| Job | Typical UK range reported | Note |
|---|---|---|
| General chimney repair | £500 to £2,000 | Average reported at around £750 |
| Chimney repointing | £450 to £1,200 | Another guide gives about £750 as a typical job |
| Replacing lead on a chimney | £350 to £920 | Average reported at about £570 |
| Flashing on all four sides | About £525 without scaffold | Roughly £1,000 once scaffold is included |
Read those as bands, not promises. The low end belongs to a short, accessible stack where one problem has to be fixed. The high end belongs to a tall stack with several faults, or a job where the scaffold is the largest line on the bill. A rebuild falls outside these bands altogether, and we explain how that is judged in our guide on whether to rebuild or repair a chimney stack.
Why the same repair costs different amounts
Nearly all the movement in a chimney quote comes from a handful of factors. Knowing them helps you compare two quotes honestly, because a cheaper one may simply be leaving something out.
Access and scaffold
A chimney is at the top of the house, and the way the roofer reaches it is often the biggest single cost. A stack on a bungalow, or on the lowest part of a roof, can sometimes be worked from a tower or a roof ladder with proper edge protection. A stack on the ridge of a two-storey house, or one that sits behind a hip or a dormer, usually needs a full scaffold. One guide to dry ridge work puts scaffold for a semi at £300 to £900, and a guide to slate repairs gives £300 to £800 for a tower or scaffold, which gives a sense of the scale for a stack. We explain when it can be avoided and when it cannot in do you need scaffolding for chimney repairs.
Height, size and number of flues
A single-flue stack on a 1960s estate house is a different job from a broad Victorian stack carrying four or six pots. More faces, more joints, more flaunching, and more lead to cut and fix. Labour rises with the surface area, and so does the weight of material that has to be carried up.
The condition behind the mortar
Repointing only works if the brick is sound. If a number of bricks have lost their faces, each one has to be cut out and replaced before the joints are filled, and the quote climbs. If the stack has moved, it moves from repair into rebuild territory, and the price moves with it.
The mortar itself
A lime-based mortar is slower to work with than a ready-mixed cement mortar and the sand has to be matched to the original. On an older house with soft bricks it is the right material, and it costs a little more in time. The reasoning behind that choice is in our note on mortar for chimney work.
What is usually in a chimney quote
When we price a stack, we itemise it so you can see where the money goes. A typical breakdown for a full repair of a stack runs like this:
- Raking out failed mortar joints to a proper depth, then repointing in a mortar matched to the brick.
- Cutting out and replacing any bricks that have lost their faces.
- Stripping and relaying the flaunching, the sloping mortar bed at the top that holds the pots and sheds water.
- Rebedding loose pots, or replacing cracked ones, and fitting cowls where needed.
- Renewing the lead flashing, the strips of metal that seal the junction between the stack and the roof.
- Scaffold or access equipment, erected and taken down.
- Clearing the site and taking rubble and waste away.
Some quotes bundle several of these, and others quote them as separate lines. Neither is wrong, but a short quote that only mentions "repoint chimney" gives you no way of knowing whether the flaunching and flashings are covered. Ask what is included, and ask what happens if loose bricks turn up once the old mortar is out.
Cost of leaving it
A small repair is almost always cheaper than waiting. Water that gets into an open joint soaks the brick, freezes and cracks it, and then runs down the inside of the stack. That water can reach the chimney breast and show as damp patches, brown stains or peeling plaster in the room below, and by that stage the repair has become a roof job and a decorating job. Our page on chimney repointing sets out what that early repair involves.
It does not follow that every crack needs immediate attention. A hairline crack in a flaunching, on a stack whose bricks are sound, can wait for a planned visit. A loose pot, a missing brick or a lean needs looking at sooner, because a falling brick is a danger to people below and can break roof tiles on its way down. If you are not sure which side of that line your stack is on, the survey tells you.
Four stacks, four different bills
It helps to picture how the factors combine. These are descriptions of typical situations, not quotes, and each one would be priced on its own survey.
The first is a short single-flue stack on a 1960s semi, with open joints on the weather face and a flaunching that has cracked but not fallen. The bricks are hard and the lead is sound. This is repointing and new flaunching, probably from a roof ladder or low scaffold, and it sits at the lower end of the bands above.
The second is the same stack with a split lead flashing on the up-slope side. The mortar work is unchanged, but the flashing adds lead, labour to chase it into the brickwork, and a second look at the tiles that lap over it. Because the water was getting in at the flashing, repointing alone would not have stopped the damp patch in the bedroom.
The third is a tall Victorian stack with six pots, soft stock bricks and lime mortar that has washed out of the joints on the weather side. Here there is more surface to rake out, a lime mix to prepare, a number of bricks to cut out and replace, and a full scaffold. It sits at the top of the repair bands, and it may tip into a rebuild if the survey shows the courses have moved.
The fourth is a stack that nobody has used for years, serving a bedroom fire that was bricked up long ago. The cheapest long-term answer might be capping the flue with ventilation kept open and repointing, or removing the stack above the roof. Each has different cost and different consequences, and our guide to capping a disused chimney shows what that option involves.
Extras that appear mid-job, and how we handle them
Most chimney jobs go as quoted, but a stack is hard to judge completely from the ground. Sometimes the old mortar comes out and reveals bricks that crumble under the trowel, or a flue liner that has cracked. A fair quote deals with this before the work starts, by describing what will happen if it is found.
Our approach is to find as much as we can at survey, because we go up and probe the stack rather than judging it from below. If something unexpected does turn up once work begins, we stop, show you a photograph, and agree the extra cost with you in writing before carrying on. You never find a surprise on the final bill. A fixed written quote means the price you agreed is the price, unless you agree a change.
It is also worth asking about the things that are easy to leave out. Does the price include the rubble being taken away? Is the scaffold hire in it, or extra? Are the flashings renewed, or only patched? What colour and type of mortar will be used? A quote that answers these in writing is a quote you can compare with another.
Planned work against an emergency
A chimney repair booked for a dry week costs less to organise than one demanded after a storm. If a pot has come down, a stack is leaning visibly or bricks are falling into the garden, the first job is making it safe, which may mean taking down loose masonry and covering the stack. We prioritise calls like that and make the roof safe first. The permanent repair can then be planned properly, with the right materials and weather, instead of being rushed in a gale. Emergency call-outs are priced differently from planned repairs, and our emergency roof repairs page explains how that side of the work runs.
Does insurance help?
Many homeowners ask whether the cost can be claimed back. Cover for chimney damage varies a great deal between policies and depends on the cause. Wear and tear and gradual deterioration are commonly excluded, while sudden damage from a storm may be covered. Read your policy, or ask your insurer before work starts. Our answer on whether home insurance covers chimney repairs goes through what to ask.
How we turn a range into a price
You do not need to guess where on the range your stack sits. We carry out the free survey, go up and test the brick, check every joint, the flaunching, the pots and the flashings, and photograph each part. You get the photographs and a written report that says what needs doing and what can wait, and a fixed written price for the work.
If the answer is a small repair, the quote will say so, and we will not sell you a bigger job. Once the work is done it is covered by our written 10-year workmanship guarantee, and we leave the site clear. A survey can be booked on 01256 213956 or by WhatsApp, and the wider range of stack work is described on our full chimney repairs in Basingstoke.
