How much does it cost to repair a chimney?
The chimney repair costs in this article are correct as of 2019
Given they have to deal with fires being lit at the bottom of them, while the wind and rain batters the top, the chimneys on our home put up with a lot. That’s why it’s vital to ensure they’re well maintained and in good working order. We’ve put together this collection of common prices involved with chimney repair projects so you’ll know what kind of costs you can expect.
Chimney flashing costs
The lead flashing around a chimney helps protect the overall roof structure from the effects of the elements, keeping rain out of the vulnerable part of the roof where the chimney meets the tiles. Good lead flashing will last for decades, but if it is badly fixed or too thin, it can come loose or crack and lead to larger problems.
The price for replacing all four sides of flashing (the apron, step flashing and back box) is around £400 to £500 for the materials and the labour - however, this is the cost if no scaffolding is involved. If it is needed, as it commonly is with chimney jobs, particularly on two-storey homes, then the cost will be around £300 to £400 more expensive, meaning a typical cost to replace the lead flashing on a chimney will be around £800.
If you are simply repairing the flashing with a new section or sealing up cracks with welding, then the costs can be around £200 for the repairs themselves, but again, the price of scaffolding will increase this.
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Chimney flue installation costs
The cost for replacing a chimney flue or lining depends on the size of the chimney, but depending on the grade of product used, can often cost around £800 to £1,200, including cleaning the chimney first. This job may also include scaffolding which can increase the overall price.
Chimney repointing costs
Repointing is vital if the mortar in your brickwork is failing and letting water into the chimney. The process is very similar to any other brickwork repointing, but as with other chimney jobs, the fact it typically has to be done at height usually makes it more expensive. A small chimney could be repointed for around £500, rising to £1,000 or more for very large chimney stacks, but the cost of scaffolding must then be added on to that.