Permitted Development explained
In England, Wales, and Scotland, solar panel installations on homes benefit from Permitted Development (PD) rights — meaning you generally don't need to apply for planning permission. This makes the process much faster and cheaper than a full planning application.
Conditions for PD rights to apply (England):
- Panels must not protrude more than 200mm beyond the roof plane
- Panels must not be installed on a roof that fronts a highway (applies to conservation areas)
- The installation must not exceed the highest part of the roof
- On flat roofs, panels must be at least 1 metre from the outer edge
When you DO need planning permission:
- Listed buildings — always require Listed Building Consent
- Properties in designated areas (conservation areas, National Parks, AONBs) — additional restrictions apply, particularly for roof-front panels visible from the street
- Flat roof ground-mounted systems above certain sizes
If you're unsure, your MCS-certified installer will advise you. Most standard residential installations go ahead without any planning involvement. Even in conservation areas, rear-facing panels often still qualify for PD. A quick pre-application enquiry to your local planning authority costs nothing and gives certainty.