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Chimney or flashing repair in London

Re-leading or replacing chimney flashings — one of the most common roof leak sources.

Greater London · updated 2026-04-11 · 1 local roofer in directory

Typical cost in London

£430–£1,830

Mid-market: £850. Local factor 1.22× national baseline (higher labour/access costs in this region). Ranges are indicative; real quotes vary with scope, access, and materials.

See the full UK roofing cost guide for the methodology and the factors that move a quote up or down.

What the job involves

Chimney flashings are the metal (usually lead) sheets that seal where the chimney stack meets the roof surface. They are the single most common leak source on UK pitched roofs because the stack moves slightly with thermal expansion and the flashings fatigue over decades.

A proper re-lead job chases out the existing lead from the mortar joint, dresses new code-4 or code-5 lead around the stack, and bedded it back in with fresh mortar. Shortcuts — silicone over old failing lead, for example — are not durable.

London — local context

Traditional material: Welsh slate on Georgian and Victorian terraces, clay tile in the outer boroughs.

London has the highest concentration of listed buildings and conservation areas in England, which commonly restrict re-roofs to like-for-like materials; inner boroughs also add parking suspension fees that push scaffold-assisted jobs above the baseline.

What changes the price

  • Stack size and whether all four faces need re-leading.
  • Scaffold requirement (almost always for chimney work above the first floor).
  • Whether the brick pointing underneath is also failing and needs repointing.
  • Whether the cowl and pot are sound or need replacing at the same time.

Timeline: Usually 1–2 days on site plus scaffold hire time.

Roofers serving London

Listings are drawn from public Companies House records and enriched where verified. See our methodology for how we build and rank this directory.

  • London Elite Roofers

    New roof · Re-roof · Flat roofing · Commercial

    Verified listing

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Common questions

How long should new lead flashing last?

Code 4 or 5 lead flashing, properly dressed and bedded, has a service life of 60–100 years on a UK domestic chimney. The failure mode is usually the mortar bed, not the lead itself.

Can I use silicone or flashing tape as a cheaper option?

Those products have a place for temporary repairs and for flat surfaces that don’t flex, but they’re not a long-term substitute for dressed lead on a chimney. A good roofer will quote the proper repair and explain why.

What does chimney or flashing repair typically cost in London?

A typical chimney or flashing repair job in London falls in the £430–£1,830 range, with the middle of the market around £850. London’s labour and access factor (1.22× the national baseline) means prices run slightly above the UK average. Actual quotes vary with access, materials, and specifics of the job.

Are there any London-specific things that affect price?

London has the highest concentration of listed buildings and conservation areas in England, which commonly restrict re-roofs to like-for-like materials; inner boroughs also add parking suspension fees that push scaffold-assisted jobs above the baseline.

How many roofers serve London through this site?

1 company in our directory currently serve London. More are added regularly as we verify new listings from Companies House and trade body records.

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