The short answer
Repair a stone roof when the damage is confined to a few slipped or broken slates and the timbers are sound. Relay it when many slates are flaking, the fixings have failed, or the frame below is rotten or sagging. Have a roofer inspect it and provide photographs with a written quote, so the fault is visible before you decide.
When repair is the right call
Our approach is to suggest the lightest work that properly cures the problem. On stone, that often means replacing a limited number of slates and refixing others. If water enters in one place, the stone around it is sound, and the battens and rafters are dry, a repair will probably do.
Typical repairs include swapping broken or delaminated slates for matching stone, refixing slipped ones on new pegs or nails, renewing a failed lead flashing, and rebedding a ridge. Good repair work also matches what is already on the roof: new slates of the same stone, thickness and size, set in the right course. Our page on stone slate repairs sets the work out in detail.
A repair is not a patch for patching's sake. If one area keeps leaking after repair, something deeper is wrong, such as a failed valley or a rotten batten, and more patching only delays the real cure. Working out which kind of fault you have is part of our survey.
Signs that a roof needs relaying
Several signs point towards relaying. One is widespread delamination, with slates across a slope peeling in layers or breaking, so that replacing them singly would mean replacing most of the roof anyway. Cotswold District Council's 2000 booklet remarks that stripping an old roof frequently turns up around half of its slates perished. That observation is no forecast for your roof, yet it shows how much stone can be lost without anyone noticing from the ground.
Another is failed fixings. If the pegs or nails have rotted or rusted, slates slip even when the stone is sound, and the roof keeps shedding them. A third is the frame beneath: rotten battens, sagging rafters or wet timber gone soft. Relaying is the moment to put those right.
A fourth is a roof repaired so often, in so many materials, that it no longer sheds water well. Our page on relaying a stone roof explains the process step by step.
What relaying involves and saves
Relaying means taking the stone off a slope, sorting it by size, repairing or renewing battens and underlay where needed, and laying the slates back in diminishing courses that begin long at the bottom and end short at the top. Sound slates are reused and perished ones replaced with matching stone. English Heritage's sourcing policy prefers freshly worked stone where extra is required, with reclaimed slates restricted to the roof they originally covered.
It is a bigger job than a repair, though not always a full renewal. You may relay one slope and repair the other. Because sound stone stays on the roof, relaying often saves money against starting afresh and keeps the roof's character. Our page on reconstituted stone slates explains why a cheaper substitute is not always the answer.
While the roof is open, the frame can be checked and mended, underlay added, and lead renewed. Those jobs are far harder afterwards, which is one reason relaying can pay when a roof has used up most of its first life.
Lifespan and the decision
The district council's booklet suggests a looked-after Cotswold roof can pass a hundred years without difficulty, and might reach 200 or 300. It adds a traditional belief that a yearly scraping might double the working life of stone. Neither claim is a promise, but both support the idea that care extends a roof's working years.
So when we say a roof has little life left, we mean the stone, the fixings or the timbers, not simply its age. A roof of 150 years with sound stone and good timbers may need only upkeep, while a younger one built with poor stone may fail sooner. Our page on how long a stone roof lasts goes into more depth.
If you are choosing between stone and another covering such as tile, our page on stone slate or tile compares them. A listing or a conservation area designation can take the choice out of your hands, so put the question to the planning department before you order stone.
Age alone should never push you into relaying. Some of the oldest roofs we are asked about have sound stone and need only a few slates and a tidy-up. Other, younger roofs have been laid badly, with poor fixings or thin stone, and fail early. The survey tells the two apart.
What moves the cost and how we help you choose
Repair costs depend on how many slates are replaced, how hard the damage is to reach, and whether scaffolding is needed. Relaying depends on area, pitch, how much stone must be replaced, the lead involved and the state of the timbers. Checkatrade's slate roof guide, updated September 2026, shows around £160 to £210 per m² as the UK average for stone slate, a general number that belongs to no particular area and stands in for no quote on your roof.
The way to choose is to see the evidence. We inspect, record what is wrong in pictures, and send a quote in writing. Where both routes are possible we can price a repair and a relay separately, so you see what the extra money buys and what it avoids. Ask whether any figure includes VAT and the scaffold.
Whichever route you take, a 10-year workmanship guarantee in writing stands behind the job. To begin, call 01793 626096, or send pictures of the problem slates through WhatsApp or the website form. Our Cotswold stone roofing page explains the service.