How long does a Cotswold stone roof last?

The clearest figures come from a 2000 technical note on stone slate roofs written by Cotswold District Council for owners and occupiers. Kept in good order, it says, a roof of Cotswold stone can easily pass 100 years, and might stay on for 200 or even 300. Checkatrade's slate roof cost guide, updated in 2026, is more cautious and says stone slate can last more than a hundred years if it is well looked after.

Two things are worth reading into those numbers. First, both depend on upkeep. Neither source suggests a neglected roof will see a century. Second, they describe the roof as a system that can be kept going, slope by slope, rather than a product with an expiry date. A slope can be stripped, sorted and laid again with much of its own stone, which is how a stone covering can end up older than the battens and pegs it hangs from.

Treat any lifespan figure as a typical range shaped by exposure, workmanship and care. It is never a guarantee, from us or from anyone else.

Limestone slate is durable; the parts holding it are not so long-lived. Each slate hangs over a timber batten from a hole near its head, on a peg that the council's guidance says was usually cleft oak, sometimes two to a slate. When a peg rots or snaps, the slate drops out of its course. Once one has gone, the slates either side and above lose some of their support, and a small gap becomes a run of slipped slates. Our answer on why stone slates hang on oak pegs explains the fixing in more detail.

Battens and mortar

Battens, the horizontal timber strips the slates hang from, soften with age and damp, especially where water has been getting in for a while. Mortar at the ridge, the verges (the gable edges) and the fillets against chimneys cracks and drops out long before the stone around it is tired. These are the first things we check on a survey, looking at the slopes outside and at the underside of the slates in the loft.

The timbers carrying the weight

Stone is heavy: the guidance gives about 1,000 kg for every 10 m² of roof. Rafters that have carried that for generations can sag or rot at their feet, and a roof whose structure is moving will open its courses however good the stone is.

The council's guidance makes a striking claim about upkeep: scrape a stone roof once a year, it says, and it could last twice as long. Moss and lichen act like a sponge, keeping the stone and the overlaps wet for days after rain. When that water freezes, it can split a slate or flake its face, and a slate that has begun to delaminate lets more water through to the batten below.

The scraping is done by hand, working down the slope with the laps. MyBuilder's 2026 roof cleaning guide puts manual scraping at about £5 to £10 per m², and cautions that a pressure washer can harm delicate tiles. On stone, a jet of water can also be driven up under the laps onto the pegs and battens, which is the opposite of what the roof needs. Your quote for any cleaning follows a look at the roof and is written like any other job.

For a simple yearly routine, see our guide to looking after a Cotswold stone roof.

Published lifespans for other coverings help put stone in context. The figures below come from different sources, use different methods, and do not always agree, so read them as rough bands.

Stone sits at the top of that list, but only with care. A stone roof left to its moss and slipped slates for decades is not comparable to one that has been scraped and refixed as it went along. Like for like matters here too: putting a lighter covering on in place of stone changes how the roof looks and loads, and on a listed house it needs consent, so check with the planning team before anything is stripped.

From the ground, look for slates out of line, gaps in a course, wavy tail lines and stone fragments in the gutter. From the loft, look for daylight between slates, damp patches on the battens and pegs that have crumbled. Any of those means the fixings are failing somewhere, even if the stone looks sound.

A survey with photographs gives a firmer picture. MyBuilder's 2026 inspection guide puts a roof survey at £150 to £500. Ours records the pegs, battens, mortar and courses, and the written quote that follows covers any work needed. When a whole slope is stripped, the council's guidance notes that about half the slates have often perished by then, so a re-lay normally combines your sound stone with new slate matched to it.

If the roof needs more than a repair, our Cotswold stone roofing page covers re-laying and repairs, and the finished work carries our 10-year workmanship guarantee in writing.