Survey finding
Lead flashing condition: what it means and what to do
Lead flashing failure is one of the most common pre-war roof findings. This page covers where lead fails, what replacement costs, and how to handle the negotiation.
Last updated: 6 May 2026. Editorially reviewed: 20 May 2026.
Finding
Lead flashing condition
What this usually means
Lead flashing seals the junction between a roof and adjacent vertical surfaces, chimneys, parapets, abutting walls, valleys, dormers. UK lead flashing has a typical service life of 60–100 years. Failure shows as cracks, splits, lifting, or replacement with mortar fillets (a common cheap shortcut that fails faster). Most pre-1970 properties are at or past the original lead's life.
Why it matters
Failed flashing causes localised damp, ceiling staining, and timber decay. The fix is straightforward but specialist. Lenders rarely refuse on lead flashing alone.
Ask your surveyor
- Check:Where are the failure points, chimney aprons, valleys, abutting walls, dormers?
- Check:Has any flashing been replaced with mortar fillet?
Ask the seller
- Check:When was lead flashing last replaced?
- Check:Have any leaks been noticed inside near roof junctions?
Next steps
- •Get two written quotes from local trades before negotiating with the seller.
- •Speak to your mortgage broker before exchanging if the finding affects mortgageability.
Tool shortcut
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What you need to know
Severity
Maintenance item. Worth quoting and including in negotiation.
Typical cost to fix
Renew a single chimney lead apron: £400–£900. Renew lead flashing on a dormer: £600–£1,500. Renew valley lead: £800–£2,500. Whole-roof lead replacement: £3,000–£8,000+.
Mortgage impact
Standard for most lenders. A retention only if combined with wider roof or chimney issues.
Insurance impact
Storm-damaged lead is typically claimable. Wear-and-tear is the buyer's responsibility.
When to pull out
Almost never a pull-out trigger in isolation.
When to renegotiate, and by how much
Get a roofer's or specialist leadworker's quote. Negotiate on quote plus 15%.
Thinking of pulling out or renegotiating? What to do after a bad survey
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Flood, subsidence, EPC, crime, schools, transport, broadband, tenure, age, listed status and price checks where data is available.
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Roof issues , often sits near lead flashing condition on a survey and is the next thing to check.
How MyPropertyScan produces this guide, and what it is not
Published by MyPropertyScan and written by Ziad Nasr, who is accountable for its accuracy. No page here is written or reviewed by a chartered surveyor, conveyancer or regulated adviser, and we do not claim otherwise.
This page is not:
- Chartered surveying — we do not inspect properties or produce RICS Home Survey reports
- Legal advice — we do not act as conveyancers or advise on title, tenure or contracts
- Mortgage or insurance advice — we are not regulated by the FCA and give no recommendations
Figures and process steps come from the published UK datasets and standards listed on this page, not from professional practice. Pages are updated when source coverage, survey cost assumptions, or lender and legal requirements materially change. Dataset limitations are set out on the methodology page.
Spotted something out of date or wrong? Email hello@mypropertyscan.com and we will correct it and change the update date.
Sources used
We use UK public and specialist sources where they are available. Public datasets can be incomplete, delayed, or missing for some addresses. Treat them as a starting point, not as a replacement for professional advice.
Source standard: preference goes to official government datasets, statutory bodies, professional standards, and primary dataset publishers. We cite the source family on the page and explain coverage limits rather than filling gaps with unsupported estimates.
- Professional standard: RICS Home Survey StandardRICS standard for condition-based residential surveys in the UK.
- Learn more from: RICS consumer guide to surveysConsumer-facing guide to survey types and when each level is appropriate.
- Official guidance: GOV.UK buying or selling your homeGovernment overview of the home buying and selling process.