How long does a lead roof last?

Two sources give numbers worth quoting. MyJobQuote's guide to replacing leadwork, last updated in September 2026, says a flashing can last for over 80 years, and over 100 for the higher codes, as long as the installation is done correctly. Less, a flat roof cost guide, puts a lead flat roof at 50 to 100 years.

Read the wording carefully. Both figures depend on the job being done properly, and the spread inside each range is large. A 50-year flat roof and a 100-year one are the same material; the gap between them is workmanship, the code chosen, how the lead was laid out and what has happened to the roof since.

Put another way, lead rarely wears out by thinning in the rain. When a lead job fails early, the cause is nearly always something that was set up on day one, and it shows up as splits, creep or lifted edges long before the metal is used up.

Lead sheet carries a code from 3 to 8, and the number stands for thickness. Leadworx calls Code 4 its standard sheet for ordinary flashing, with Code 3 for soakers, the small hidden pieces that sit under a stepped flashing. MyJobQuote's longer figure of over 100 years is tied to the higher codes, which are thicker and heavier.

The reasoning is simple. A thicker sheet has more metal to lose to creep and fatigue before it fails. Where a piece is long, exposed or walked on, the thin codes are working harder, so they are the first to stretch and split. Our answer on the right code for flashing sets out which code suits which job.

If a quote says only "lead" with no code, ask which one is meant. The code decides how long the work is likely to last, and it is the easiest line to compare between two quotes.

Four causes account for most early failures that we are asked to look at. None of them is the weather alone.

Pieces cut too long

Lead swells a little in warm weather and draws back as it cools. A piece with too much length to move in works against its fixings, and eventually it tears or ripples. MyJobQuote's guidance fits the correct code in 1.5 metre lengths for this reason. Our answer on why lead is fitted in short lengths covers the movement in full.

Fixing that holds too tightly or too loosely

Lead that is nailed hard across its whole width cannot slide, so it cracks along the fold. Lead that is barely held lifts in the wind and creases until it work-hardens. Both are fixing faults, not material faults.

A wrong repair over the top

Tape or mastic smeared over a split can hold for a season and leave a leak running behind it. The metal below looks fine and the timber beneath it is not.

Theft and damage

Lead that has been taken is, of course, no longer lasting at all. See our guide to lead theft from roofs for what follows.

Lead is soft, and a soft metal that is bent back and forth by the daily swing of temperature will tire at the points where it flexes most. Folds, corners and the edges of long laps are where fatigue gathers. Given enough cycles, a hairline crack opens, water finds it, and the area below is wet before anyone sees a stain.

Short, well-lapped pieces spread that movement across many joints instead of a few. That is the practical meaning of a long life for lead: it is a design that lets the metal move without tearing. Cracking has its own answer on why lead roofs crack, with the repair options.

Patination is a separate question. The grey-white film that forms on lead is normal and protects the surface underneath. It changes the colour and not the thickness, so a dull roof is not a worn-out one. If you are seeing heavy white streaks on the walls below, that is run-off and not a lifespan problem, and we explain it elsewhere on this site.

From the ground, with binoculars, look for edges that stand away from the wall, sections that have slid down a slope, and ripples that run across a sheet. In the loft, look for stains on the timbers beneath a lead valley or flat roof. Any of those is a sign that the fixings or the lengths are not coping, even if the metal is thick.

A lead flat roof on a Stroud period house may be old enough that the first covering was laid long before anyone alive can remember. Our guide to lead flat roofs on period houses covers the system; this answer is about the years.

A survey photographs the lead, the laps and the deck, and the quote we write afterwards lists a repair and a full renewal on separate lines, so you can weigh one against the other. For comparison, MyBuilder's 2026 flat roof guide puts a lead flat roof at £150 to £200 or more per m², and MyJobQuote and Checkatrade give per-metre figures for flashing repairs. Those are national guide figures and not our prices.

Whatever is laid, it carries our 10-year workmanship guarantee in writing. Ring 01453 933613, send a WhatsApp message, or post a photo of the lead through the website form, and we will tell you which part we would examine first. You can also read about lead roofing in Stroud more generally.