Chimney Repair & Flashing Guide: Stop the Leaks

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.