Quick Answer
The Silent Leak CulpritIf you have a leak near your chimney, the flashing is almost always the cause. Lead flashing creates a watertight seal between the chimney stack and the roof tiles, but over time it can crack, lift, or corrode.Types of Flashing RepairRe-pointing: Replacing ...
Key Information
- Last Updated:
- 22 Apr 2026
- Category:
- Roof Repairs
- Reading Time:
- 1 min read
The Silent Leak Culprit
If you have a leak near your chimney, the flashing is almost always the cause. Lead flashing creates a watertight seal between the chimney stack and the roof tiles, but over time it can crack, lift, or corrode.
Types of Flashing Repair
- Re-pointing: Replacing mortar around the flashing. Cost: £150-£300.
- Flashing replacement: Removing and re-fitting new lead. Cost: £300-£600.
- Full chimney re-build: If the stack itself is deteriorating. Cost: £1,500-£4,000.
DIY or Professional?
Chimney work always requires working at height. Unless you are experienced and have proper scaffolding, this is firmly a job for a qualified roofer. A botched repair can make the leak worse and void your insurance.
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I appreciate your guide on chimney repair & flashing, but could you clarify why re-pointing costs less than half of a full replacement? Is it due to materials or labour time?
I've found that cracked step flashing is often overlooked. It's worth checking this too, especially if your roof has been exposed to extreme weather.
Just had my chimney flashed in Bristol, and it's made a world of difference. Leaks were driving me mad – thanks for the clear guide!