Stone to tile
Can you replace a stone roof with tiles?
The short answer
Sometimes, but it is rarely a simple swap. On an unprotected house it can be possible, subject to the timbers, the pitch and the Building Regulations. On a listed building, or where a direction removes your rights, changing the covering is likely to need consent first. Tiles also alter the look, the load and the lowest pitch that works, so the survey comes first.
What has to be settled before a stone roof gives way to tiles: permission, weight, pitch and insulation, and when keeping the stone is the better course.
Permission comes before the tile catalogue
Three questions steer the route. Does the building have a listing? Does it stand in a conservation area, in the National Park or under an Article 4 direction? And would the change show up from the road as a different roofline, colour or texture? Section 55 of the Town and Country Planning Act 1990 says works that leave the external appearance materially unchanged are not development, but trading stone for tile does change the appearance, which makes it a matter for the planning team.
On a listed house, section 7 of the Planning (Listed Buildings and Conservation Areas) Act 1990 bars works affecting its character unless authorised, and a new covering is exactly that. Even on an unlisted house, a conservation area or a direction can limit your options. Put the question to the council in writing before ordering a single tile. Our guide to re-roofing a stone roof in a conservation area suggests what to ask.
Weight and the timbers beneath
The timbers under a stone roof were framed to carry heavy slabs. The Planning Portal advises a weight check whenever a new covering is clearly lighter or heavier than the old, and suggests taking a structural engineer's or surveyor's opinion before any work begins. It also says approval from building control is needed when the new covering makes the roof 15 per cent heavier or more. Approved Document A phrases the same idea as an increase of more than 15 per cent.
A lighter covering might ease the load on tired timbers, but the result hangs on which product is picked and on what the frame turns out to be, so the sums can run either way. Stone slabs are thick and uneven, and old frames have often been altered over the centuries. We examine rafters, battens and wall plates from the loft at survey and report what we find. Our guide to weight, timbers and pitch under stone goes into more depth.
The pitch decides which tiles are possible
Every tile has a lowest pitch at which it works, and the roof you already have must meet it. Marley publishes minimums running from 15 degrees for its Lincoln clay pantile, through 30 to 40 degrees for its clay plain tiles, to 35 degrees for concrete plain tiles, and from 12.5 to 25 degrees across its interlocking concrete range. Those are one maker's numbers. Read the maker's data sheet for the exact tile before you fall for a sample in the showroom.
The pitch of an old stone roof forms part of its character, and it is not a figure to nudge so that a tile fits. Changing it alters the roofline, and that is something else the council will want to see. Measuring the pitch is among the first jobs at survey. If the slope is too shallow for the tile you like, the answer may be a different tile, a different covering or simply keeping the stone you have.
Insulation and ventilation when the covering changes
Re-covering a roof can bring Part L of the Building Regulations into play. Approved Document L 2021 wants the roof's insulation upgraded once more than 50 per cent of its surface has been renovated, and treats renovation of more than 25 per cent of the external envelope as a major renovation. The 2026 edition takes effect on 24 March 2027 with the same renovation triggers.
The roof also has to breathe. Marley's guidance on cold roofs sets eaves ventilation according to the pitch and the type of underlay, so a new covering and its underlay must be planned together. Building control will want to see how that has been done. Where the work is notifiable, we deal with the Building Regulations notification, and we explain the consent position when we visit, so the quote reflects whichever route your roof falls into.
When keeping the stone is the better answer
We would rather give you a straight view than a sales pitch. Where the slabs are healthy and the trouble sits in battens, pegs or lead, re-laying the same stone is usually the smaller job, and the roof stays recognisably itself. A cheaper-looking move to tiles can turn out dearer once consent, a structural check and insulation upgrades are added to the bill.
There are genuine reasons to change: stone that has lost its face over wide areas, a structure beyond saving, or a roof altered long ago. Even then, a stone replacement from reclaimed or new supplies may be the route a council prefers, and a council's preference carries real weight on a protected building. Our guide on Horsham stone and its alternatives compares the options, and the Horsham stone roofing page describes the work itself.
Related questions
Stone to tile queries
Will tiles spoil the look of an old stone house?
It can. Tiles are thinner and more regular than stone slabs, so the roofline looks different from the lane even where the colours match, and the character of the building shifts with it. That change of appearance is the reason a council may refuse it on a protected building, so ask before you commit.
Is a tile roof cheaper than stone?
Not always. Checkatrade's repair table puts concrete tile at £90 to £120 per square metre against £150 to £220 for natural slate, before VAT, but a full change adds consent, structural checks and insulation work. The survey and the written quote give the true comparison.