Is my roof right for solar?

Jason Hawthorne, CEO at ESME

Rates checked October 2026 · 5 min read · Last updated 22 October 2026

In short

A roof suits solar if it faces between east and west through south, gets sun for most of the day and has room for about 20 to 30 square metres of panels. The thing most often missed is condition. If the roof needs work in the next few years, do that first, so the panels do not have to come off again.

For your house

How much would your roof make?

Two minutes. You'll see your result on screen.

Key facts

Best direction

South, with east and west about 15 to 20% lower

Best pitch

About 39 degrees, though pitch matters little

Space for 4.5kWp

About 20 to 30 square metres

Each panel

About 450W and about 2 square metres

Planning

Usually not needed, with exceptions

Which way does it need to face?

South is best. East and west facing roofs make about 15 to 20% less, but they spread the power across the morning and evening, which can suit a home that is busy at those times. Panels on both an east and a west roof work well together. North facing roofs are not recommended.

Pitch matters less than people think. The best angle in the UK is about 39 degrees, and most pitched roofs are close enough.

What else should I check?

1
Shade. Trees, chimneys and neighbouring buildings can cut output a lot. Ask the installer how shade is allowed for in their estimate.
2
Space. A typical 4.5kWp system needs about 20 to 30 square metres, around 12 panels of about 2 square metres each.
3
Condition. Panels usually last 25 years or more. If tiles, felt or the structure need work soon, do it first, and share the scaffolding.
4
Strength. Your installer should check the roof can carry the weight, especially on older or flat roofs.

Do I need planning permission?

In England, most roof panels on a house are allowed without planning permission, under rules updated on 27 August 2026. On a pitched roof the panels must sit no more than 200mm from the roof and not above its highest part. On a flat roof they can stand up to 600mm high.

You do need permission for a listed building, and in conservation areas panels cannot go on a wall or roof facing a road. Your installer must also tell the local network operator, and larger systems need approval before they are connected.

Questions people also ask

Can I put solar panels on a flat roof?

Yes. They are mounted on frames, up to 600mm above the roof under permitted development in England.

Are east and west facing roofs worth it?

Often yes. They make about 15 to 20% less than south, but spread power across the day.

What if my roof needs replacing soon?

Replace it first. Taking panels off and putting them back costs money and risks damage.

Sources

Figures are for Great Britain and were checked on the date above. Prices change, so check the latest before you decide. This is general information, not financial advice.

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