Key takeaways
- Roof-mounted solar is permitted development for most homes, so no planning application is needed.
- Panels must sit close to the roof and not rise above the highest part of it, and ground-mounted arrays have a size limit.
- Conservation areas, listed buildings and road-facing roofs are the main exceptions that need permission.
- Planning is separate from the grid connection your installer arranges with the network operator.
For most homes, solar panels do not need planning permission because they fall under permitted development. The exceptions are mostly about heritage and visibility. Here is how to tell whether you are clear to go ahead.
When you do not need permission
Roof-mounted panels on a typical house are permitted development as long as they do not protrude far beyond the roof slope (around 200mm, with recent rules easing this slightly), and do not sit above the highest part of the roof, excluding the chimney. Ground-mounted systems are also allowed within limits, generally up to around 9 square metres and under 4 metres high, with one array per property.
When you do need permission
Listed buildings need consent, and you should assume permission is required. In conservation areas, Areas of Outstanding Natural Beauty and similar designated land, you cannot fit panels on a wall or roof slope that faces a road without permission, though a rear slope out of public view is usually fine. Flat roofs and unusual mounting can also tip you into needing approval.
The catch: permitted development is not the same as no rules. Even when planning is not needed, your installer still has to arrange a grid connection with the network operator, and conservation or listing can override the general allowance. Always confirm with your council if there is any doubt.
Check before you commit
A quick call to your local planning authority settles it, especially for older or protected properties. A good installer will also flag anything that needs an application. See our solar panel costs guide and how to choose a solar installer.
FAQ
Do solar panels need planning permission?
Usually not. Roof-mounted panels on most homes are permitted development within the size and projection limits. Listed buildings, and road-facing roofs in conservation areas, are the main cases that need permission.
What about a conservation area?
You generally cannot fit panels on a roof or wall facing a highway without permission, but a rear slope that is not visible from the road is usually permitted development. Check with your council to be sure.
Is planning the only approval I need?
No. Separately from planning, your installer arranges a grid connection with the local network operator. This is a standard part of the process and they handle it for you.