Lead flashing lifespan
How long does lead flashing last?
The short answer
Properly fitted lead flashing can last over 80 years, and more than 100 in the heavier codes, according to MyJobQuote's September 2026 guide. That describes the metal under good conditions, not a promise for your roof. In practice the weak point is often what holds the flashing in, such as the mortar joint or the fixings, so a flashing can need work long before the lead itself is spent.
How long lead flashing is meant to last, what tends to fail first around a chimney or wall, and when a repair is enough.
The figure, and where it comes from
MyJobQuote's cost guide to chimney lead flashing, last updated on 22 September 2026, says lead flashing that is correctly installed can last for over 80 years, and over 100 years for the higher codes. It adds a condition that matters: the right code of lead, fitted in lengths of about 1.5 metres, so that it can expand and contract with the temperature without cracking.
That is a fair description of what the metal can do. It is not what every flashing on every house will manage. A flashing fitted decades ago may be in good shape, and a newer one may already be lifting. The difference lies in the code, the length of each piece, how well it was dressed into the brickwork, and what has happened to the wall since.
It also pays to separate the two meanings of the question. Some people ask how long the lead lasts, and others ask how long the flashing keeps the rain out. The first can be a century. The second depends on every part of the junction, and one weak link is enough to end it.
What gives out before the lead does
Lead is a patient material. The things around it are less so. A flashing that leaks at forty years old has usually not worn through. Something about its fixing has let go.
- Mortar joints. The upper edge of many flashings is tucked into a cut-out brick joint and pointed. Weather breaks that pointing down, and the edge of the lead then lifts or lets water behind it.
- Fixings and clips. A flashing held by clips or wedges can slip when they fail, and a loose edge catches the wind.
- Movement. A chimney that has shifted, or a wall that has cracked, drags the lead with it and opens a seam.
- Poor earlier repairs. A smear of sealant or cement over a gap hides it for a season and leaves it worse.
Our guide to lead flashing names each part and shows where these faults appear. Our answer on mortar or sealant explains the choice at the joint.
Spotting a flashing that is near the end
A fair amount can be learned without leaving the house. Outside, watch for lead standing off the wall, a gap along a joint, or a dark stain running down the brick below the flashing. A bulge or a ripple in the sheet suggests the lead has crept down under its own weight.
Inside, the signs are damp patches on a ceiling beside a chimney breast or along a party wall, and a musty smell after heavy rain. A daub of sealant along the top edge tells you someone has tried to fix it before, which usually means the original fault is still there.
Stains on a ceiling are not proof that the flashing is at fault, because other things cause the same marks. That is why we trace the water before we price anything. If the lead itself has cracked or worn thin, no pointing will rescue it. Where the lead is sound and only its joint has gone, the answer may be small. Our answer on why lead flashing leaks follows the trail.
Repairing a flashing or renewing it
A tradesman quoted by MyJobQuote says a patch repair will not last as long as a full fit, but will hold the rain out for a few years. Another says lead can be reused where the brick joint is cleaned out and dust-free, the lead is reinserted and new mortar is placed, or a lead sealant is used instead.
Those answers sum up the choice. Repointing a sound flashing, or re-fixing a loose edge, is a repair and can be a sensible one. Where the lead is split, thin or badly distorted, or where the flashing has been patched several times already, renewal is the better use of money, because it removes the cause instead of covering it.
We photograph the flashing and the joint before we give a verdict, and recommend the smaller job where it will hold. If you are weighing tape against lead, our answer on flashing tape against lead sets out the difference. Renewal is dressed in the proper code, in short lengths, to give the long life the guides describe.
Cost, scaffolding and your written quote
What you pay turns on the length of flashing, how it is reached and what the brickwork behind it is like. MyJobQuote's typical figures for a chimney lead flashing are £150 to £250 for a patch and £350 to £920 for a full replacement, the higher end applying where scaffolding is needed. See our guide to lead flashing repair cost for the detail.
Those are national figures, so they show scale rather than what your roof will cost. After the survey we put a single total in writing. Whoever quotes, ask if scaffolding and VAT are in it, because scaffolding alone accounts for the gap between those two full-replacement figures. Chimney flashing is often the first job where access decides the price. The lead roofing and leadwork page covers the work we take on.
Related questions
Lead flashing lifespan queries
Will a new flashing outlast the old one?
It can, if the code, the length of each piece and the fixing are right. Lead of a suitable weight, fitted in short lengths and pointed properly, is what the long-life figures assume. The survey checks that the wall behind it is sound.
Can a leaking flashing wait until spring?
A small leak can do slow harm to timbers and plaster, so it is better looked at than ignored. We prioritise leaks, make the roof safe first, and tell you plainly whether the repair can be planned or needs doing soon.