The short answer
Often, yes. Sound tiles and slates can be lifted, sorted and laid again on new battens and underlay, which saves material and preserves the roof's existing appearance. The roofer sorts out cracked, laminating or soft ones, and a sorted stock may not cover the whole roof, so a few new or reclaimed tiles make up the numbers.
Which old tiles and slates go back
The covering is separate from the layers beneath it. When a roof is stripped for new underlay and battens, the tiles or slates come off in sections, and each one is checked before it is stacked. A sound clay tile or natural slate can sit on a new roof for decades more.
The test is simple. A tile rings when tapped and shows a clean, even edge. A tile that sounds dull, has a hairline crack, or a surface that flakes away in layers is finished. Slate that has started to delaminate, splitting into thin sheets, or has turned soft at the edges will not take a second life. Nail holes that have enlarged, or tiles with a broken nib at the head, need replacing for the same reason.
Concrete tiles can be reused too, if they are sound and the profile is still in use. Their edges chip when they are lifted and re-laid, so allow for some loss. Old tiles also carry moss and lichen, which can hold water in the surface and shorten the life of what is left.
We photograph the sorted stack so the keepers and the rejects are both laid out for you.
Reclaimed Welsh slate and how long it lasts
Slate has a good record for a second use, but it is not unlimited. HomeBuilding (Sep 2025) gives typical lives in its supply-only table: Welsh slate "100+ years", Spanish natural slate "75-100 years", and reclaimed Welsh slate "50-80 years". Treat them as typical ranges and never as promises. The reclaimed range is the shorter of the two because the first roof used up some of that slate's life.
Clay is the other long-lived option. HomeBuilding gives clay tiles "60-80 years", while Marley notes that the BRE minimum of 60 years applies to clay only. Concrete tiles are shorter: HomeBuilding gives "40-50 years" for plain concrete, while Marley quotes around 60 years for its roof tiles with no warranty implied. Where two sources disagree, both names are given and the kinder figure is not chosen.
A tile or slate that is reused has less life left than a new one, and that sets the question for you. A covering that is 20 years old may give good value on new battens. One nearing the upper end of its range gives you a new roof under a worn surface.
The page on roof replacement cost shows how the covering choice moves the figure.
Mixing old and new tiles
Sorting nearly always leaves a gap. Some tiles break in the lift, some are rejected, and a few were already missing. The shortfall is made up with reclaimed tiles of the same type or with new ones. Where it is done well, you cannot tell from the road.
The craft is in where the mixed tiles go. New tiles are usually placed on the back slope or on the lower courses of a slope that is hidden from the street, and the old ones are kept for the front. That keeps the face of the house uniform for years while the new tiles weather. A roofer who scatters new tiles evenly across the front produces a patchy look that takes years to fade.
Matching also matters for the fixings. A tile from another maker, or a profile with a different lap, can leave gaps between courses and let in rain. The profile, the headlap and the batten gauge all need to agree. We measure the old batten spacing on the survey and check it against the tile that will go on.
The same questions apply to repairs, and the page on replacing half a roof covers how a new half meets an old one.
When reuse is not the right call
Reuse saves on materials, but it adds labour, because every tile is handled twice and sorted by hand. Where the covering is tired, the saving disappears: you pay to lay a roof that will need replacing again in a few years, and a second scaffold costs more than the tiles saved.
Weight can also decide it. A new covering that is 15 per cent or more heavier brings Building Regulations approval and a structural check, as the Planning Portal says. A thin slate replaced by a heavy concrete tile is that case. Reusing what is already on the roof avoids the question, which is one more reason it is worth considering when the rafters are old.
There is a planning angle too. On a listed house, or inside a conservation area, the original tiles can be part of the character, and a council may expect them kept or matched. Basingstoke and Deane's four Article 4 town-centre areas call for Welsh slate and clay tiles to stay.
We give you the sorted stock, the shortfall and one written price after the survey, so you can choose reuse or a new covering with the numbers in front of you. See roof replacement for the full job.
