Do you need planning permission for solar panels in the UK?

Most domestic solar panel installations do not need planning permission. They qualify as permitted development, meaning you can install them without submitting a planning application to your local council.

However, there are situations where permission is needed. Here is a clear summary.

When solar panels are permitted development

Solar panels on a domestic property are treated as permitted development if:

• The panels do not protrude more than 200mm from the roof surface (or the wall, if mounted on a wall)
• The panels are not on a wall or roof slope that fronts a highway (facing the road), unless there is no alternative
• The property is not a listed building
• The installation is not in a World Heritage Site
• The combined installation does not cover more than the roof area of the largest building on the property

These rules apply in England. Scotland and Wales have slightly different rules but broadly follow the same approach.

When you do need planning permission

Listed buildings

If your property is listed (Grade I, Grade II*, or Grade II), you need listed building consent before installing solar panels. The application goes to your local planning authority. Applications are assessed on a case-by-case basis.

Conservation areas

Properties in conservation areas do not automatically need planning permission for solar panels, but additional restrictions may apply. Panels visible from the street in a conservation area may require prior approval or a full application. Check with your local planning authority if you are in a conservation area.

National Parks and Areas of Outstanding Natural Beauty

Permitted development rights may be more restricted in National Parks and AONBs. The Chilterns is an Area of Outstanding Natural Beauty: some locations within the AONB may have additional restrictions. Your installer should flag this at the survey.

What about flat roofs?

Flat roof solar installations are also generally permitted development, though the panels often need to be mounted at an angle on frames. The 200mm protrusion rule still applies to the mounting frame height above the roof surface.

Ground-mounted solar

Ground-mounted solar panels in a garden are permitted development for domestic properties up to 9 square metres and no more than 4 metres high. Larger ground installations need planning permission.

The Chilterns AONB: what does it mean for you?

Much of our service area falls within or adjacent to the Chilterns AONB. In practice, roof-mounted panels on a standard domestic property are very rarely refused in the AONB, and permitted development rights still apply in most cases. If your property is in a particularly sensitive location or you are concerned, your local authority will confirm in writing whether an application is needed.

Do I need to tell anyone?

You do not need to inform the council if your installation is permitted development. However, you should notify your energy supplier (to register for the Smart Export Guarantee if applicable), your building insurer, and your mortgage lender. Most lenders and insurers welcome solar panels as they increase property value.