Chimney Repairs
Every part of the chimney stack repaired, from the pots down to the flashing.
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Chimney flashing repair in Windsor, Berkshire and South West London, with failed flashings renewed in proper lead that lasts for decades rather than months. Book a free inspection and you get photos of the chimney junction and a fixed written quote before any work starts.
A chimney is a brick stack passing through a tiled or slated roof, and the two move differently. The flashing is what seals the gap between them. It is the most common leak we find on homes across Windsor and Berkshire, and the water it lets in shows up on a ceiling or a chimney breast, often well away from the stack.
A full chimney flashing has four parts:
The signs one has failed: lead lifted away from the brick, mortar missing from the joints the lead is tucked into, sealant smeared along the junction, or damp in the loft beside the stack after rain.
We renew flashings the traditional way, in lead, because it is the only material that lasts as long as the roof around it.
The old flashing, any sealant and the tiles next to the stack come off so the junction can be seen properly.
A lead back gutter is formed behind the stack and soakers fitted under each course of tiles at the sides.
Stepped flashings cut to the brick courses and tucked in, then the front apron dressed over the tiles below.
The lead is wedged into the raked-out joints and pointed in, then the tiles are refitted and the site cleared.
The quick fix for a leaking chimney is a tube of sealant or a strip of self-adhesive flashing tape run along the junction. It is cheap and it stops the drip, for a while. Then the chimney and the roof move a fraction in the next frost, the sealant cracks away from the brick and the leak is back, often worse because water has been tracking behind it.
Lead is different. It is heavy enough to stay where it is dressed, soft enough to be worked tight to every tile and brick, and it moves with the building rather than cracking away from it. Properly cut, dressed and wedged into the brickwork, a lead flashing lasts for decades rather than months.
The weight of lead matters too. Flashings, soakers and back gutters each need the right thickness for the job, so the lead is stiff enough to hold its shape and thick enough to last. We fit the correct code of lead for each part, not one roll for everything.
Our roof repair cost guide puts a lead flashing repair at a chimney or abutment at £200 to £500 for 2026, dressed and renewed in proper lead, not sealant. A small stack where one side has lifted sits at the bottom of that range. A full set of new flashings, soakers and a back gutter on a large stack sits at the top.
Access decides much of the cost. Many chimney flashings are reached with a roof ladder from a tower, while a tall stack on a steep roof needs scaffolding. If it does, the quote says so plainly.
If the brickwork the flashing tucks into has crumbled, the joints are repointed as part of the job, because new lead in rotten mortar falls out again. See our chimney repointing page for that. Everything comes in a fixed written quote after a free inspection.
On this Richmond re-roof every junction and detail was dressed in new lead flashing, including where the chimney passes through the new clay tiles. Lead worked properly moves with the building and keeps water out for decades. Every photo is from the job.
Tell us where the damp is showing and we will book a free inspection and give you a fixed written quote. Water coming in beside the chimney now? Call us, we answer 24 hours a day.
Tell us about the job, we usually reply within the hour.
Prefer to talk? Speak to Cornelius on 01753 330566 or
Expert Roofer Verified member“Seal Pro Roofing did a superb job on our roof replacement. They were punctual, tidy and kept us informed throughout. The workmanship was excellent and the price was fair. Very impressed with their customer service and would happily use them again in future.”
“Seal Pro Roofing delivered a great service. The team were knowledgeable and worked carefully to ensure everything was done properly. The roof looks solid and well finished. Very happy with the professionalism shown.”
Every part of the chimney stack repaired, from the pots down to the flashing.
Chimney repairs →
Weathered mortar raked out and repointed, stopping damp on the chimney breast.
Chimney Repointing →
Redundant stacks taken down safely and the roof decked, felted and tiled to match.
Chimney Removal →
Leaks traced to the real entry point and fixed at the source, with photos of the fault.
Leaking Roof Repair →Free written quotes. 24hr emergency callout. A local team rated 5.0 by 150+ homeowners on Bark.