The short answer
Mending an old stone roof with like stone seldom needs planning permission, conservation area or not. The exceptions are a listed building, where works affecting its character need listed building consent, and land under an Article 4 direction. Dormers are not permitted development in a conservation area. Ask your council first.
Mending like for like
The 1990 planning statute (section 55) excludes from the idea of development any upkeep or alteration whose effect on external appearance is no more than slight. In practice, taking off worn stone slates and putting back matching ones, in the same pattern and the same courses, generally needs no planning permission. Living in a conservation area does not change that, which surprises many owners who expect an automatic application.
Everything hangs on the word matching. Swap a sound stone covering for concrete tiles or a reconstituted slate and the look of the house shifts, which puts you in different territory. Even new stone laid in uniform courses can alter the appearance. We treat the roof you have as the pattern, copying its slate sizes, colour, texture and the way the courses diminish up the slope.
Our Cotswold stone roofing page describes repair and relaying. Where a job is plain like-for-like repair, we get on with the roofing. Where consent could come into it, you hear about that before you accept a quote.
What a conservation area adds
A conservation area is a place of special architectural or historic interest whose character a council has chosen to preserve or enhance. Living in one does not stop roof repairs, but it brings extra controls: demolition needs consent, applications get wider publicity, and anyone cutting down trees must give six weeks' notice. For roofs, the main effect is that some permitted development rights are narrower.
Dormers show this best. A dormer is not permitted development on land of this kind, so a planning application is needed and the council will scrutinise how it sits against the stone. Roof windows are different. Class C of the permitted development rules can still apply with conditions, one being that any window in a side slope must be obscure-glazed. Our page on stone roof dormers shows what a well-made one looks like.
Solar equipment, flues and chimney changes follow separate rules that this page leaves aside. If your plans include any, speak to the council before you order materials.
Listing and Article 4 directions
Two things can override that comfortable position. The first is listing. Section 7 of the Listed Buildings Act 1990 requires consent for works that affect a listed building's special character, and carrying them out without it is an offence. Putting a different covering over stone would clearly affect character. Even a like-for-like repair can need a conversation, depending on its extent, so ask before you strip anything. Our page on listed stone roofs goes further.
The second is an Article 4 direction, a power under the General Permitted Development Order that lets a council withdraw named permitted development rights across a defined area. Where one covers your street, work that is normally allowed may need an application. The planning team can tell you whether one covers your address.
Cotswold District's Local Plan Policy 27, set out in the council's 2000 stone roofing booklet, says permission will be refused where taking off a listed building's natural roof and fitting a modern substitute would do significant harm to what makes it special. For a historic cottage under stone, that makes honest repair the safer path.
Where to ask and what to bring
Contact the planning team for the council area your house sits in. Around Swindon that may be Swindon Borough Council, and on the Cotswold edge it may be Cotswold District Council. Councils offer pre-application advice, and Swindon's planning pages recommend it. Put three questions: is the house listed, does an Article 4 direction apply, and does your plan need an application?
Give the officer what they need: the address, clear pictures of the roof, what covers it now, what you want instead, and exactly what is changing. If the stone stays and only fixings or lead are being renewed, say so. If you plan to change the roof shape, add a dormer or alter the material, expect to apply.
We can explain how consent applies to a roofing project, and we handle the Building Regulations notification where work is notifiable. Legal advice is not our line, so the council's reply is the one to rely on. Our page on stone roof insurance deals with the separate matter of cover.
Matching the stone
Consent aside, conservation officers care how a roof looks. English Heritage's sourcing policy, which the 2000 Cotswold booklet reproduces, rules out standing one rock type in for the other, so a limestone roof is not patched with sandstone. Fresh slates beat second-hand ones, and reclaimed stone should go back to its original site, whether a single house or a row. Artificial substitutes are described as inappropriate for historic buildings, and sawn slates can look wrong as well as perform badly.
That policy gives a fair sense of what a council is likely to expect. If a section of stone needs mending, the best case is a repair that blends with the old covering in courses and finish. Our pages on sandstone against limestone and stolen stone slates show why matching matters.
Let us look at the roof first. The survey shows what is wrong, whether repair or relaying makes sense, and what a planning officer will probably ask. You get the price on paper, and our 10-year workmanship guarantee comes in writing too. That paper trail helps if a planning officer ever queries the roof's history, and it gives the next owner something to inherit with the house.