Stroud District has 41 conservation areas, from Wotton Under Edge and Painswick to the mill valleys, and a large number of listed buildings. Plenty of them are roofed in natural slate. Replacing a failed slate roof on one of them is not the same job as doing it on a 1990s semi, because the slate, its size, its colour and its fixing all contribute to the character that the designation protects.
This guide is about the decisions that sit around the work: whether consent is needed and from whom, how to match a slate to the one it replaces, what to do with the old slates, and how details such as ridges, valleys and verges are finished. It does not repeat the arguments for reusing slates, which have their own answer on reusing old slates on a re-slate. For the service overall, see slate roofing in Stroud.
Which kind of protection does your building have?
Three different things get called "protected", and they carry different rules. Find out which applies before you ask anyone to price the roof.
- Listed building. Listing protects the entire building, whatever its grade, and the council says so plainly. Listed building consent must be granted before any work that changes what makes the building special; going ahead regardless is a prosecutable offence.
- Conservation area. The area as a whole is protected, so unlisted houses within it can have their permitted development rights restricted. Five carry Article 4 Directions, which strip back some permitted development rights: Bisley and Frampton on Severn, plus Wotton Under Edge and the two central Stroud areas.
- Curtilage structures. A garden wall or outbuilding next to a listed house may count as part of it. The council's conservation department can confirm the status of any such structure.
The council's Article 4 page does not say if roofs fall within any direction, so put that question to the planning team and do not assume. Churches in use are handled differently: the diocese grants a faculty for roof work. A redundant church or converted chapel falls under the council, which normally means listed building consent.
If you are unsure what status a building has, search the council's conservation pages or call the planning team before the roofer starts. It takes a short enquiry and saves a stop-work letter.
Consent: what needs asking and what does not
The Planning Act definition of development (section 55(2)(a), 1990) excludes works that leave a building's external appearance materially unchanged from the definition of "development". A genuine like-for-like re-roof therefore does not normally need planning permission. That is the starting point, and it is only the starting point, because a conservation area with an Article 4 Direction, or a listing, changes the answer.
Listed buildings
Listed building consent turns on a different question from planning permission: does the work touch the building's special character? Re-covering a listed roof in the same slate, fixed the same way, may not need consent in the council's view, but changing the type of slate, the size, the source or the fixing often does. We do not decide that for you. The decision is the council's, and the planning team can say, in writing, whether a described repair is acceptable.
What to bring to the conversation
- Survey photographs of the roof, near and from the lane.
- A short specification: the slate, its source and size, the fixings, the underlay, the leadwork.
- A note of what is being kept and what is being replaced.
We prepare that specification as part of the survey and explain what consent is likely to be needed. We also look after the Building Regulations notification when the job is notifiable. Our listed and conservation roofs guide covers the process in more detail, and the roof planning permission guide explains the planning side.
Matching the slate: source, size and finish
A replacement slate on a protected roof should look like the one it replaces. That sounds simple, and it gets harder the older the building is, because slate comes from many quarries and each one weathers to a slightly different colour, texture and thickness.
Source
Welsh slate, Spanish slate, Cornish slate and slate from other sources differ in colour, grain and thickness. Welsh and Spanish slate can differ in tone and in how evenly they colour. Our comparison of Welsh and Spanish slate sets out the difference. On a listed roof, the council may ask for a particular source, and it is easier to match when the old slates are identified before the stripping starts, not after.
Size and coursing
Older roofs may mix widths and lengths, and some are laid in diminishing courses, with rows that shorten as they climb. A tidy, uniform modern slate laid in regular courses on such a roof will look wrong from the lane even if every individual slate is good. We measure the existing slates and courses, record them with photographs and match the replacement to them.
Thickness and surface
A thin, smooth slate lies flat and casts a thin shadow line. A thicker, rougher one gives a heavier edge. If the replacement is much thicker or thinner, the shadow line changes. We bring samples to the survey so the owner and, where relevant, the conservation officer can compare them on the roof.
Old slates, new slates and where each belongs
Good old slates are worth keeping. They are weathered to the building, they carry its colour, and sourcing the same slate new may not be possible. On a protected building the usual approach is to strip carefully, sort the slates into sound and unsound, reuse the sound ones on the most visible slopes and use new slate of matching type where the old has failed.
Our answer on reusing old slates deals with the practical checks. For conservation, three principles stand out.
- Keep reclaimed slates with their building. The English Heritage policy quoted in Cotswold District Council's 2000 stone slate guide reserves reclaimed slates for the building, or neighbouring group, that they were stripped from. It was written about stone, yet it is a sensible rule for natural slate as well, and the council will tell you what it expects.
- Match like to like. The same policy bars swapping sandstone for limestone slates and wants new stock to agree with the old across geology, colour, texture, size and thickness. Man-made slate differs from natural slate in the same way.
- Do not trade a real slate for an artificial one. That policy treats artificial and reconstituted substitutes as unsuitable for historic buildings.
The Cotswold stone slate roofs found across much of the district are a separate service, covered by our Cotswold stone roofing hub. This page is about natural slate.
Fixings, underlay and the case for doing it properly
Conservation work does not mean copying every shortcut of the original. It means keeping the look and fixing it better. The two usually go together.
Copper nails or hooks
Historic slate roofs were nailed. The sounder modern equivalent is copper nails, or stainless steel where the slate and exposure allow, which do not corrode in the way the iron nails of a century ago did. Hooks, which hold the tail of the slate and are almost invisible, are not suitable on every roof: Cupa Pizarras advises keeping hooks off any pitch under 25 degrees. Our guide to nails or hooks explains the choice. On a listed roof, ask the council whether it expects nails, since they match the original appearance.
Underlay
A re-slate normally gets a breathable underlay beneath the battens, with ventilation worked out to BS 5250. Old roofs often had none and relied on torching or the slates alone. Adding an underlay improves performance, yet it changes how the roof breathes, so it should be listed in the specification you share with the council.
Battens and structure
New battens and, where needed, sound repairs to rafters are almost always necessary once the slates come off. Old timber that is still sound is kept. Where the new covering weighs 15 per cent or more above the old, expect Building Regulations approval and a structural check.
Detailing: ridges, valleys, verges and lead
On a protected building the character of the roof is in its edges as much as its field of slates. Four details deserve attention.
Ridges
The ridge caps the apex, where the slopes join. Slate roofs historically had clay, lead or stone ridges. Under BS 5534:2014, bedding mortar is not trusted alone to keep ridge and hip pieces on, so each is mechanically fixed too. We match the ridge type to the original and fix it to the standard.
Valleys
A valley is the inside corner between two slopes. Valleys on old roofs may be lead-lined, or formed in slate laid to follow the angle. Slate valleys are a skilled detail, and lead needs the right code and careful dressing.
Verges and eaves
The verge is the roof edge along a gable. On older buildings it is often a simple bedded slate edge with no bargeboard. Preserving that profile keeps the look of the building, and we do not replace it with a modern dry-verge system unless the council accepts it.
Leadwork
Lead flashings should follow the original design where it works. Code 4 is generally used for flashings and Code 3 for soakers, with heavier codes for valleys and gutters. If a flashing was previously formed in cement, we replace it with lead.
Every one of these goes into the survey notes with a photograph, leaving a record of the roof as it was.
What conservation slate work costs and how to plan it
A listed or conservation-area slate roof is priced after the survey, because access, the slate and any consent conditions set the figure. MyBuilder's 2026 slate cost guide gives a typical re-slate at £100 to £180 per m², with Welsh slate £140 to £180 and Spanish £100 to £130, and a slater's day rate of £200 to £300. MyBuilder puts a single slipped slate at £60 to £120. Checkatrade's slate guide, last updated September 2026, notes that slate prices vary with where the slate comes from. These are national figures, and a listed roof usually sits at the upper end of any range because of the extra care, matching and recording.
What shapes the price on a protected building:
- Scaffold on steep or narrow sites, which MyBuilder puts at about £1,125 for a re-roof on a typical house.
- Sourcing matching slate, and any wait for it.
- Time spent sorting old slates and keeping the good ones.
- Leadwork, ridges and any chimney work that comes with it.
Expect the quote to cover every item once we have surveyed. Our workmanship guarantee runs for 10 years and is written down; the site is left clear.
If your roof is exposed to storm damage as well as age, our guide to slate roofs in storms explains how weather finds weak points, which is useful when deciding what to repair first.