Solar on thatched properties
You will not be putting panels on the thatch. The question is whether anything else on the property can carry them — an outbuilding, a tiled extension, or the ground — and whether the building’s listed status closes that off too.
Not on the thatch. That part is simple.
Thatch is a loose organic covering, renewed on a cycle, with nothing to fix to and a fire risk that insurers price carefully. There is no mounting system for it and no sensible proposal involving one.
The real question is what else the property has: an outbuilding with a conventional covering, a tiled extension, or the ground. And whether the building is listed, because that decides how much of the site is constrained.
Why the thatch itself is out
Nothing to fix to. Thatch is bundled material held by spars and fixings into a substrate. It is not a structural surface and no mounting system is designed for it.
It is renewed periodically. Ridges every 8 to 15 years, full coats less often. Anything fixed through it would have to come off and go back each time.
Fire. Thatch fires are a recognised and well-documented risk, and insurers price accordingly. Introducing electrical equipment and DC cabling into or onto that covering is not a conversation any installer wants to have.
Ventilation and moisture. Thatch is a breathing covering. Anything laid over it changes how it dries.
What to look at instead
Outbuildings. A garage, barn, stable or workshop with a tile, slate or metal covering. This is the commonest answer and it is a good one: Class A covers “a building situated within the curtilage of a dwellinghouse”, with no area limit and no boundary setback.
With one large caveat. Class A does not permit solar on a building within the curtilage where the dwellinghouse is listed. If the cottage is listed, the outbuilding route needs planning permission — and possibly listed building consent, if the outbuilding is caught by curtilage listing.
Conventional extensions. Many thatched houses have later tiled or slated additions. A rear extension not visible from the road is the classic acceptable location.
Ground mounting. Often the right answer on a rural plot, and it avoids the historic fabric entirely. Class B’s limits are tight — one array, 4 m high, 9 m² of panel, 5 m from every boundary — and standalone solar is not permitted at all within the curtilage of a listed building, so a listed cottage means a planning application. See ground-mounted solar.
A great many thatched buildings are listed, and listing can extend to structures within the curtilage that predate 1 July 1948 — which is exactly the barn or cart shed you were eyeing for the array.
Works affecting a listed building’s character without consent are a criminal offence under section 9 of the 1990 Act. Establish what is listed, and at what grade, before designing anything.
Insurance
Thatch insurance is a specialist market and it is priced around fire.
Tell your insurer before you install anything, anywhere on the property — including an outbuilding or a ground array. Insurers of thatched buildings ask detailed questions about electrical work, heat sources and outbuildings, and a change you did not disclose is a problem you do not want.
Ask specifically about proximity. An array on a barn twenty metres from the cottage is a different question from one on a lean-to attached to it.
Keep the paperwork. The handover pack — MCS certificate, electrical certificate, building regulations compliance — is what an insurer will ask for.
A realistic route
- Establish the listing. What is listed, what grade, and whether curtilage structures are caught.
- Inventory every surface on the property: outbuildings, extensions, and open ground.
- Talk to the conservation officer early if anything is listed or in a conservation area. Free, and it shapes the scheme.
- Tell your insurer what you are considering.
- Model the options — an east-facing barn roof may beat a south-facing patch of garden once Class B’s 9 m² limit is applied. Our orientation figures and generation dataset will tell you by how much.
- Apply for what needs applying for, using the free heritage statement template if the property is in a conservation area.
Sources
- The Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2, Part 14
- Planning (Listed Buildings and Conservation Areas) Act 1990, section 7
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