Chimney Repair Cost Calculator
Most chimney work is £400–£1,500. A full stack rebuild is £1,000–£3,500. Access is a large part of every one of those numbers, which is why doing several jobs in one visit is so much cheaper than doing them separately.
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Chimney jobs are small in materials and large in access. Re-flaunching is £300–£600 of work that needs £600–£1,300 of scaffold to reach, which is why the sensible move is to do everything the stack needs in one visit.
Diagnosis matters as much as price. A damp patch in the bedroom next to the chimney breast is usually failed lead flashing, not a failing stack — and flashing is a fraction of a rebuild.
Before removing a stack: check whether it carries load, and whether it is shared. On a mid-terrace the stack is usually half your neighbour's, which makes removal a party wall matter as well as a building one.
Chimney repair cost (2026)
| Job | Typical 2026 cost | Notes |
|---|---|---|
| Re-flaunching (mortar cap) | £300–£600 | Cracked cap around the pots |
| Repointing the stack | £400–£1,200 | Raking out and re-pointing |
| Lead flashing | £400–£950 | The most common leak source |
| Flue liner | £600–£1,500 | Required for most new appliances |
| Stack rebuild | £1,000–£3,500 | Taken down and rebuilt |
| Stack removal | £900–£2,200 | Plus making the roof good |
| Scaffold to the stack | £600–£1,300 | Often half the total bill |
Figures match our chimney repair cost guide.
What changes a chimney repair quote the most
Scope is everything, because “chimney repair” covers a huge range. Renewing the flaunching that beds the pots, or repointing the stack, is a modest job; replacing cracked pots, renewing the lead flashing where the stack meets the roof, or rebuilding the stack from the roofline up are progressively bigger, and a full rebuild with new flashing sits at the top end.
Access drives the rest. A chimney is at the highest and most exposed point of the house, so almost every repair needs a scaffold or tower, and that goes up before any masonry work starts. A mid-terrace stack reached only across neighbouring roofs adds design and sometimes a licence.
The cheapest long-term decision is often to deal with the cause — failed flashing or porous pointing lets water in and does the damage you are now paying to fix. If the stack itself needs repointing, the repointing calculator prices that element.
Chimney repair calculator FAQs
Usually not. The most common cause is failed lead flashing where the stack meets the roof, at £400–£950, against £1,000–£3,500 for a rebuild. Get someone to look at the flashing before agreeing to anything bigger.
Because the repair is a day of work and the access is a fixed cost regardless. It is the single best argument for doing the flaunching, the pointing and the flashing together rather than calling someone back next year.
For most new or replacement appliances, yes — an unlined or degraded flue is a carbon monoxide risk and the installation will not be signed off without one. Ask the installer what the flue test showed.
Often, but check two things first: whether it carries any load, and whether it is shared. Mid-terrace stacks are usually half your neighbour's, which brings the Party Wall Act into it.
Related cost guides
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- Find a builder — 3 free quotes
- Reading a quote — prime and provisional sums
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