Chimney Repair Costs UK — What to Charge for Repointing, Flaunching and Rebuilds in 2026

Chimney Repointing

Repointing is the most common chimney job. Over decades, weather strips the mortar joints between the bricks, leaving them recessed, soft or completely open. Once water can sit in an open joint it freezes, expands and accelerates the decay — so repointing is as much about preventing future damage as tidying the appearance. You rake out the failed mortar to a sound depth and re-point with a fresh, weather-struck or bucket-handle finish.

For the actual brickwork, a typical domestic stack takes a competent bricklayer between half a day and a full day. The materials cost is small — a few bags of sand, cement and lime. What dominates the price is access. Once you are up there, repointing itself is straightforward; getting safely up there is not.

• Repoint a single domestic stack (labour and materials, access excluded): £250–£500
• Typical all-in repointing job including scaffolding: £400–£900
• Large, tall or multi-flue stack (e.g. Victorian terrace): £900–£1,500+

On older property always check the original mortar. Pre-1920s brickwork is usually built with a soft lime mortar, and re-pointing it in hard modern cement traps moisture in the brick and causes spalling. Quote a lime mortar mix where appropriate and explain why — it justifies a higher price and protects you from blame when the cheaper job down the road fails.

Re-flaunching and Re-bedding Pots

The flaunching is the sloped mortar fillet on top of the stack that beds the pots in place and sheds water away from the brickwork. It is the single most exposed piece of mortar on the whole chimney, so it is almost always the first thing to fail — cracking, lifting and crumbling away. Once the flaunching goes, water gets into the top of the stack and pots can work loose, which is both a damp problem and a safety problem.

Re-flaunching means hacking off the old fillet, re-bedding the pots if they have moved, and laying a fresh sloped mortar bed. It is a quick job once you are up there — usually an hour or two of work — but again the access drives the price.

• Re-flaunching the mortar fillet (labour and materials, access excluded): £150–£350
• Re-flaunch combined with re-bedding loose pots: £250–£450

Re-flaunching pairs naturally with repointing — if you are scaffolded for one, quote the other. Most stacks that need repointing also need the flaunching attended to, and bundling them spreads the access cost across more billable work.

Chimney Pot Replacement

Pots crack from frost, get knocked by falling debris, or simply degrade after a century of exposure. A cracked or leaning pot is a falling hazard and needs dealing with. Replacement involves lifting out the old pot, supplying the new one and re-bedding it into fresh flaunching.

• Standard clay pot — supply only: £40–£120
• Roll-top, cannon-head or decorative reclaimed pot — supply only: £100–£300+
• Supply and fit a single pot (access excluded): £150–£350
• Typical all-in single pot replacement with access: £400–£800

On period property the homeowner often wants to match the existing pots for appearance — reclaimed and decorative pots cost considerably more than a plain clay one and can have long lead times, so price the pot itself as a supply line and confirm availability before you commit a date.

Flashing Repair and Replacement

The flashing is the lead that seals the joint where the chimney stack passes through the roof. Failed flashing is one of the most common causes of chimney-related damp — water tracks down behind defective lead and shows up as staining on the ceiling near the chimney breast. The problem is frequently misdiagnosed as a chimney leak when it is actually the flashing.

Repairs range from re-dressing and re-sealing existing lead to a full strip-out and replacement of the front apron, side step flashings and back gutter in new code 4 or code 5 lead. Cheap repairs using flashing tape or mastic are a false economy and you should steer customers away from them; proper lead, correctly dressed and pointed into the brickwork, is the right answer.

• Re-seal / re-dress existing flashing: £150–£300
• Replace flashing on one or two sides: £250–£450
• Full lead flashing replacement (apron, steps and back gutter): £400–£600+

Where flashing is being replaced as part of a wider chimney job it should be quoted as a separate line, because customers frequently want it priced both ways — with and without — so they can decide how far to go while the scaffold is up.

Repairing vs Rebuilding

There comes a point where patching a stack is no longer sensible. If the brickwork is heavily spalled, the stack is leaning, or the mortar has failed all the way through the courses, repointing the surface will not fix the underlying problem. At that stage the stack needs taking down to a sound course and rebuilding.

A rebuild — whether a partial rebuild from the roofline up or a full rebuild including the section in the loft — is a substantial job involving brickwork, new flaunching, re-bedded or new pots, and usually new lead flashing. It is messy, weather-dependent and demands proper bricklaying skill at height.

• Partial rebuild from roofline up: £1,200–£2,500
• Full chimney rebuild including flashing and pots: £2,000–£5,000+

Be honest with the customer about which side of the line their stack falls on. Repointing a stack that should be rebuilt buys them eighteen months and then the problem — and the call — comes back to you. Document the condition with photographs so your recommendation is on record.

Removing a Chimney Stack

Many homeowners with a redundant chimney choose to remove it rather than maintain it. Removal splits into two distinct jobs with very different costs and complexity.

Removal above the roofline

Taking the stack down to just below the roof line, removing the brickwork above and making the roof watertight with new tiles and lead is the simpler option. The flue and breast inside the house stay in place. This is the more common request.

• Remove stack above roofline and make good the roof: £800–£2,000

Full removal including the breast

Taking out the chimney breast as well — through the loft, first floor and ground floor — is a structural job. It typically requires the remaining brickwork to be supported, often with gallows brackets or a steel beam, plus plastering, flooring and decoration to make good. This is notifiable work that needs Building Control approval and usually a structural engineer's calculations.

• Full chimney breast removal with structural support and making good: £2,000–£5,000+

Never quote a full breast removal without factoring in Building Control and, in most cases, an engineer. Removing load-bearing masonry without the correct support or sign-off is dangerous and creates a serious liability for whoever carried out the work.

Capping, Cowls and Bird Guards

When a chimney is no longer used, the right answer is rarely to seal it completely — that traps moisture and causes damp. The correct approach is to cap the pot while allowing a small amount of ventilation, paired with an air vent into the room below. There is a steady stream of work here, and it is quick, profitable and an easy upsell when you are already on the roof.

• Fit a hooded capping cowl / vented cap (supply and fit, access excluded): £60–£150
• Fit a bird guard or anti-downdraught cowl on a working flue: £80–£200
• Spinning / rotating cowl for persistent downdraught: £100–£250

Cowls are one of the few chimney jobs where the part cost is significant relative to the labour, so price the component as a supply line and add your fitting and access on top. Always specify a vented cap on a capped-off flue, never a fully sealed one.

Damp and Condensation Problems

A large share of chimney enquiries start as a damp complaint rather than a request for a named repair. The customer has a stain on the ceiling or a patch on the chimney breast and wants to know why. As the specialist, diagnosing the cause correctly is where you earn your reputation.

• Defective flashing: the most common cause — water tracking down behind failed lead at the stack.
• Failed flaunching or open joints: rain entering the top of the stack and soaking down through the masonry.
• Sealed but unvented flue: a chimney capped off with no ventilation traps moisture and produces damp on the breast.
• Condensation in a redundant flue: common where an old flue is unlined and unused.

Resist the temptation to quote a repair before you have identified the actual source. Pricing a repoint when the real problem is the flashing means the damp returns and the customer comes back unhappy. A short written diagnosis with your quote sets you apart and protects you.

Scaffolding and Access Costs

Access is the single biggest variable in chimney pricing and the one operators most often get wrong. Working at the top of a stack on a two-storey property falls squarely under the Working at Height Regulations 2005, and for most jobs that means a proper scaffold or a powered access platform. Ladders alone are not acceptable for working on a stack.

Always get a price from your scaffold supplier before you quote, or build in a conservative allowance based on known day rates. A chimney scaffold often needs to reach above the ridge, which can be more involved than a standard eaves-height scaffold.

• Chimney scaffold to a 2-storey stack: £800–£1,500
• Larger, taller or awkwardly positioned stack: £1,500–£2,500+
• Cherry picker / MEWP hire (half-day to full day): £300–£700

For a quick job — a single cowl, a flashing reseal — a scaffold tower or a MEWP can be far cheaper than a full scaffold, provided the ground and access allow it. On a mid-terrace where the stack is in the middle of the roof, neither may reach and a full scaffold is unavoidable. Work the access method out before you price, not after.

If a competitor has quoted a two-storey chimney job with no access cost in it, that is a sign they intend to skip proper safety provision. Use that in your sales conversation — a stack repair done off a ladder is a genuine danger and a false economy.

Building Regs, Gas Safe and HETAS

Most cosmetic chimney work — repointing, re-flaunching, pot replacement, flashing — is not notifiable. But some chimney work crosses into regulated territory and you need to know where the line is.

• Building Control: required for full chimney breast removal and any work affecting the structural integrity of the building.
• Gas Safe: any work on a flue serving a gas appliance must be carried out or signed off by a Gas Safe registered engineer.
• HETAS: the recognised competency body for solid fuel — relining a working flue for a wood burner or open fire is HETAS-registered territory.

If the chimney serves a live appliance, do not touch the flue itself unless you hold the right registration. Confine your quote to the masonry, flaunching, pots and flashing, and bring in the relevant registered engineer for anything involving a working flue. Making this clear in your quote builds trust rather than undermining it.

Quoting Tips — What to Inspect Before You Price

Chimney quotes go wrong when the operator prices off a photo from the ground or the customer's description. Before you commit a number, get up to the stack — or at minimum survey it carefully with binoculars or a drone — and check:

• Mortar condition: are the joints simply weathered, or has the mortar failed all the way through? This is the repoint-versus-rebuild decision.
• Pot condition: cracks, leaning, loose bedding. A loose pot is a falling hazard and must be flagged.
• Flaunching: the mortar fillet is almost always cracked — assess whether it needs renewing.
• Flashing: check the lead on all sides of the stack and the back gutter. This is where most damp originates.
• Structural lean: a stack leaning away from prevailing weather is a rebuild candidate, not a repoint.
• Internal damp: ask to see the chimney breast inside — staining tells you whether water is already getting in.
• Access constraints: stack position on the roof, ground conditions, neighbouring property and conservatories all dictate the access method and cost.

Include a short written survey with your quote — mortar state, pot and flaunching condition, flashing assessment, access notes and photographs. A one-page report elevates your quote above competitors who just send a figure, and it protects you by putting the property's condition on record before you start.

Quick Reference: Chimney Repair Prices UK 2026