Chimney Repairs London

Written by Muhammad Ahmad, Construction Superintendent at Golden Roofing Expert Ltd. Last updated: 26 October 2026.

Chimney repairs are one of the most common jobs we are called to in London, and one of the most misdiagnosed. Water appearing near a chimney is often blamed on the pointing, when the real fault is the flashing at the roof junction, a cracked flaunching, or a pot that has lost its seal.

I have lost count of the times a homeowner has been quoted for a full rebuild when a new piece of lead was all the stack needed. At Golden Roofing Expert Ltd, we survey the stack from the roof, photograph the fault and quote for the repair in writing. We are based at 10 Sale Pl, Tyburnia, London W2 1PX and work across the city, with over 15 years of experience on London chimney stacks.

In short:

• We find the actual cause before we quote, so you pay for the repair you need.
• Flashing is cut in and dressed in lead, never mastic or tape.
• You get photographs of every fault and a fixed written price.
• Surveys and quotes are free.

Chimney Repair Services We Provide

• Lead flashing replacement at the roof junction
• Repointing and rebuilding weathered stacks
• Flaunching repairs around pots
• Chimney pot replacement and removal
• Caps and cowls to stop rain and birds
• Removal of redundant chimneys and making good

Why Chimney Repairs Are So Often Misdiagnosed

A damp patch on a chimney breast looks like a chimney problem, so people blame the brickwork. In my experience, the water usually gets in lower down, at one of these points:

• The flashing. This is the lead that seals the joint where the stack meets the roof. Old flashing lifts, splits or pulls out of the mortar joint, and water tracks behind it.
• The flaunching. This is the mortar bed around the pots. Once it cracks, rain runs into the flue and down the chimney breast.
• The pot. A cracked pot, or one that has lost its seal, lets water in at the top.
• The brickwork. Weathered or frost-damaged bricks absorb water, which is common on stacks that are over a century old.

I recently re-leaded a leaking stack in Islington where the stain inside the room was several feet from the real entry point. You can see the finished work on our chimney repair in Islington page.

If water is entering around the chimney right now, our roof leak repair service explains how we trace the entry point.

Signs Your Chimney Needs Repair

• Damp patches on the ceiling or chimney breast
• Crumbling mortar or loose bricks on the stack
• Pieces of mortar or tile on the roof or path
• Lifted, split or missing lead around the base of the stack
• Smoke or draughts coming back into the room
• A leaning pot or a missing cowl

You can often see some of these from the ground with binoculars. If you notice any of them, a quick look now is far cheaper than a rebuild later. Frost spalls the face of the bricks, and once that happens repointing alone is no longer enough.

How Our Chimney Repairs Are Carried Out

Most repairs are done from the roof or from a scaffold tower, depending on height and access.

1. Survey and photographs. We inspect the stack, flashing, flaunching, pots and the loft side of the chimney, and photograph each fault.
2. Written quote. You see the cause, the repair options and a fixed price before anything begins.
3. Flashing. We cut a groove into the mortar joint, usually about 150mm above the roof level, and dress stepped lead into it. The lead is wedged and pointed, not stuck on with mastic. Roofing bodies such as the Lead Sheet Association set out good practice for lead work, and we follow it.
4. Pointing. We rake out the old mortar and replace it with a suitable mix. On older Victorian and Edwardian stacks, the mortar must suit the soft brick, because a hard cement mix can trap water and make the bricks crumble.
5. Rebuild where needed. Where a stack is unstable, we rebuild the affected section rather than patch it.
6. Handover. We clear the site and send you the after photographs.

We tell you before work starts whether scaffolding is needed, because it affects both cost and timing. Roof work is hazardous, and the Health and Safety Executive publishes guidance on safe working on roofs, which is why we do not recommend DIY repairs at height.

Cost of Chimney Repairs in London

Prices vary by the height of the stack, access and how much repair is needed. These are typical London ranges for 2026, based on current UK price guides plus the usual 20–30% London uplift. Your own quote will depend on the survey.

A few things worth knowing:

• Repointing and re-flaunching are often done together, which spreads the access cost.
• Doing chimney work at the same time as other roof work saves scaffolding costs, so ask us about combining it with a roof repair in London visit.
• A lead flashing renewal at a few hundred pounds can solve a problem that was quoted as a rebuild, which is why I always check the flashing first.

We survey and quote free, so you know the price before committing.

When to Repair and When to Rebuild or Remove

A stack that is sound but weathered usually needs repointing and new flashing. A stack that leans, has loose bricks that crumble in your hand, or has frost-damaged faces needs a rebuild of the affected section. I always tell people honestly which one it is. If a chimney is no longer used, removing it above the roofline and making good can also be sensible, though it depends on the structure below.

Before any removal, a few checks apply:

• Shared stacks. Many London terraces share a chimney breast with a neighbour. Work on a shared stack may fall under the Party Wall etc. Act 1996, so tell us early.
• Conservation areas. Chimneys on listed buildings, or in conservation areas, may need consent before they are changed. The Planning Portal explains how to check with your council.
• Building regulations. Removing a chimney may be notifiable work, and we explain what applies before we start.

If the roof around the chimney is also failing, we will say so and explain whether a new roof installation or flat roof work makes more sense.

Chimney Safety: A Note on Smoke and Fumes

If smoke or fumes are coming back into the room, stop using the fire or stove and get the chimney checked. A blocked or damaged flue can allow carbon monoxide to build up, which you cannot see or smell. The NHS explains the symptoms of carbon monoxide poisoning. Fit a working carbon monoxide alarm in any room with a fire or stove. We repair the stack and the roof side, and a chimney sweep or a qualified engineer should check the flue itself.

Chimney Repairs Across London

Victorian and Edwardian terraces across Camden, Islington, Kensington, Chelsea, Brent and Ealing rely on original chimney stacks that are now well over a century old. We also work on 1930s semis in Barnet and Harrow and on commercial buildings in Westminster. If your area is not listed, call and we will confirm cover for your postcode.

Why Choose Golden Roofing Expert for Chimney Repairs

• 5.0 rating from 489 Google reviews, and listed on TrustATrader
• A local roofing team, not a national call centre
• Photos of every fault and written quotes with no doorstep pressure
• One company for the stack, the flashing and the roof around it

Learn more about our team, and for standards that apply to roofing contractors see the NFRC. To stop faults developing, ask about our roof maintenance service, and if a blocked gutter is feeding water into the wall below, see our guttering service. For the rest of the roof, see our roof repair service, tiled and slate roof repair and roof cleaning.

Chimney Repairs FAQs

Why does my chimney leak only in heavy rain?

Driving rain finds failed flashing, cracked flaunching or porous brickwork that ordinary rain does not reach. It is a common pattern and usually straightforward to fix once the entry point is found.

Do you need scaffolding for chimney repairs?

Sometimes. Many repairs can be done from the roof or a tower. We confirm before booking and include the cost in the quote.

How much do chimney repairs cost in London?

Small repointing and flashing jobs usually fall between a few hundred pounds and about £1,000. Partial and full rebuilds cost more. See the price table above, and we give a fixed written quote after the survey.

Can you remove an unused chimney?

Yes, subject to the structure below and any building regulations that apply. We will explain what is involved and make good the roof afterwards.

Do you repair chimney pots and caps?

Yes. We replace cracked pots, fit caps and cowls, and reseal around the pot where water is getting in.

Can a leaking chimney be fixed with mastic or flashing tape?

It can hold for a short time, but I would not recommend it. It fails quickly, and the damp it hides can spread. Correctly dressed lead is the lasting answer.

Book a Chimney Repair in London

Call +44 7723 782655 or request a free quote. A photo of the stack helps us assess it before the visit.