Do I need planning permission for solar panels in a London conservation area?

Solar panels are permitted development on most London properties, so you won't need planning permission. The exceptions: conservation areas, listed buildings, and panels that protrude more than 200mm from the roof surface or face a highway. If any of those apply, check with your borough planning department before signing anything.

Can solar panels go on a flat roof in London?

Yes, and it's more common than you'd think. Flat roofs on extensions and purpose-built flats are everywhere in London. Installers use angled frames tilted at 30 to 35 degrees, which actually lets you point panels due south regardless of the building's orientation. Expect to pay £300 to £600 extra for the mounting framework.

Why are solar quotes in London sometimes cheaper than in rural areas?

Competition. London has roughly 4,800 MCS-certified solar installers, the highest concentration in the country. More installers chasing the same jobs means keener pricing. Get at least three quotes and you'll almost certainly find one below the national average for your system size.

Solar Panels

Solar Panel Costs in London: 2026 Guide

Eco Home Check Editorial Team

Last reviewed: 2026-04-12T14:44:51.925051+00:00By Eco Home Check Editorial Team

A 4kW solar system in London costs £6,000–£9,500, and the city gets around 1,500 hours of sunshine per year. That's enough to generate roughly 3,400 kWh annually, which covers about half of a typical household's electricity. With 4,800 MCS-certified installers competing for work across Greater London, prices here are often more competitive than you'd expect.

~4,800

MCS Installers

£6,000–£9,500

Avg. Cost (4kW)

1,500

Sunshine Hours/yr

45%

Homes Below EPC C

What London homeowners actually pay

£6,000 to £9,500. That's the range for a 4kW system in London, fully installed with scaffolding, which tends to cost more here than anywhere else in the country.

The good news: London has roughly 4,800 MCS-certified installers, the densest concentration in the UK. That competition pushes prices down. We regularly see London quotes come in below the national average when homeowners get three or more.

A south-facing system at that size produces around 3,400 kWh per year in London, enough to cover roughly 75% of an average household's electricity. Combined with a Smart Export Guarantee tariff for the surplus, most installations pay for themselves within 8 to 10 years. For a full breakdown of system sizes and pricing, see our guide to solar panel costs.

London's roofs: what works and what doesn't

Victorian terraces in Hackney. 1930s semis in Croydon. New-builds in Stratford. London's housing stock is all over the place, and each roof type has different installation considerations.

Period properties in conservation areas may need council approval. Flat-roofed extensions, common across inner London, actually work well because adjustable tilt frames let you point panels due south regardless of the building’s orientation.

One thing to watch: scaffolding. London scaffolding costs run higher than the national average, so always confirm your quote includes access equipment before you sign.

Solar panels or a heat pump first?

If your home already has decent insulation, solar panels are usually the better starting point. They cut your electricity bill from day one and, if you later install a heat pump, the panels offset the increased electricity demand.

A heat pump replaces your gas boiler but increases electricity usage. Fitting solar first means that extra electricity costs you less. Our solar panels vs heat pumps comparison walks through the full decision. Our solar panels vs heat pumps comparison walks through the decision in detail.

Grants you can use in London

Up to £7,500

Boiler Upgrade Scheme

£7,500 off a heat pump. Your installer applies, Ofgem processes it, and the grant comes straight off your bill. Funding is confirmed through fiscal year 2029/30 under the Warm Homes Plan.

Learn more

Fully funded for eligible households

ECO4

If you're on Universal Credit or Pension Credit, your energy supplier could fund a full heating and insulation upgrade. No catch, no upfront cost. ECO4 covers everything from cavity wall insulation to heat pumps, and it's available across England, Wales, and Scotland until December 2026.

Learn more

See what you qualify for in London

Two minutes. No obligation. Find out which government energy grants apply to your property.

Check your eligibility

100% freeTakes 2 minutesNo obligation

Common questions about solar in London

Do I need planning permission for solar panels in a London conservation area?: Solar panels are permitted development on most London properties, so you won't need planning permission. The exceptions: conservation areas, listed buildings, and panels that protrude more than 200mm from the roof surface or face a highway. If any of those apply, check with your borough planning department before signing anything.
Can solar panels go on a flat roof in London?: Yes, and it's more common than you'd think. Flat roofs on extensions and purpose-built flats are everywhere in London. Installers use angled frames tilted at 30 to 35 degrees, which actually lets you point panels due south regardless of the building's orientation. Expect to pay £300 to £600 extra for the mounting framework.
Why are solar quotes in London sometimes cheaper than in rural areas?: Competition. London has roughly 4,800 MCS-certified solar installers, the highest concentration in the country. More installers chasing the same jobs means keener pricing. Get at least three quotes and you'll almost certainly find one below the national average for your system size.