Chimney repointing and lead flashing costs
A chimney is the most exposed masonry on the house. It gets weather on four sides, it has no roof over it, and the mortar in it is often the original. When it starts to fail, the damp that follows is usually blamed on the roof.
Chimney prices are set by access first and brickwork second. Getting a safe platform to the stack is usually the largest single item, which is why doing pointing, flaunching and flashing together in one visit costs far less than three separate call outs.
Access sets the price
A stack on a rear slope reached from a scaffold tower is one price. A stack on a party wall between two terraced houses, needing a full scaffold and a neighbour's permission, is another entirely. Before comparing quotes, check whether each includes the access or assumes you will arrange it.
Repointing
Raking out the perished joints to a proper depth and repointing in an appropriate mortar. On older stacks a softer lime based mix is often correct, because a hard cement mix traps moisture in soft brick and accelerates spalling. Depth of rake out and mortar choice are the quality difference here.
Flaunching
The sloped mortar cap that holds the pots. It cracks, then water runs straight into the stack. Renewing the flaunching is a small job in isolation, but almost never worth a dedicated visit, so we fold it into any other chimney work.
Lead flashing to the roof
Front apron, side soakers with step flashings, and a back gutter behind the stack. Each piece is a separate item and the back gutter is the one most often skipped by a cheap quote. Lead should be code appropriate and in short laps, not one long unbroken strip that will fatigue and split.
Rendered and painted stacks
Render on a chimney hides what is happening underneath and traps water when it cracks. Where it has failed we price both patch and full removal back to brick, and explain what each commits you to over the following decade.
Removing or reducing a stack
If a chimney is redundant, taking it down below roof level and tiling over is a legitimate option and often cheaper than a full rebuild. It changes the look of the house, so we talk it through rather than assume.
The one visit rule
Because access dominates the cost, we always quote the whole stack: pointing, flaunching, pots, flashings and any cracked bricks. Fixing one item and returning next year for the next means paying for the platform twice.
FAQs
Usually failed flashing or perished pointing letting water into the stack, which then travels down inside the brickwork and appears at ceiling level, often several feet from where it got in.
Yes. A capped but ventilated pot keeps rain out while letting the stack breathe. Sealing it completely traps moisture and causes staining inside.
For most stacks, yes. Lead alternatives have their place on awkward details and where theft is a genuine risk, and we will recommend one where it is the better answer.
Most domestic stacks are a one to two day job once access is up. The scaffold hire period is often the longer part of the timeline.
Related reading
More on costs & budgeting and the jobs that usually come with it.
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- Flat roof cost: GRP versus EPDM versus feltCosts & budgeting
- Repair or replace? How to decide honestlyComparisons
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