Indicative 4 kWp install in London: £7,100–£8,350. Region: Inner London (×1.12). Annual irradiance: ~970 kWh/kWp.
What London homeowners actually pay
London solar installs sit at the top end of UK pricing because labour, parking and scaffolding all cost more here. A typical 4 kWp panel-only install on a Zone 2 terrace lands between £6,500 and £8,500. Add ~£4k for a 5 kWh battery. Generation is also slightly lower than the south coast — irradiance averages ~970 kWh per kWp per year — but London's high import tariffs mean payback is still strong, typically 8–11 years.
Local notes for London
Conservation areas in Westminster, Camden and Kensington often need planning consent before front-elevation panels go up.
Listed buildings in central boroughs require Listed Building Consent — even on rear roofs invisible from the street.
Many SW and W postcodes sit inside conservation areas — installers usually default to in-roof or all-black panels for visual approval.
Flat roofs are common in Zone 1–2 mansion blocks; ballasted frames add cost vs. tile-hook mounting.
Field notes
Conservation-area applications add 6–8 weeks before install can start.
CPZ permit parking in inner boroughs adds £30–£50 per van per day to the labour line.
DNO is UK Power Networks — G98 notification is automatic for systems up to 3.68 kW per phase.
Frequently asked questions
Do I need planning permission for solar in London?
Most domestic installs are permitted development. The exceptions in London are listed buildings (Listed Building Consent required) and conservation areas where panels face a highway (planning consent often required). Your installer will check your borough's policy before quoting.
Do I need freeholder consent for solar on a London flat?
Almost always yes for any roof-mounted install on a leasehold property. The lease typically requires written freeholder consent and a Deed of Variation. Allow 4–8 weeks for paperwork before scaffolding can go up.
Will south-facing panels in London actually pay back?
Yes. London's irradiance (~970 kWh/kWp/yr) is below the south coast but well above Scotland. Combined with London's higher-than-average grid import prices, a south-facing 4 kWp system typically pays back in 8–11 years.
Are there parking and CPZ costs we'll be billed for?
Most London installers factor permit parking into the day rate, but it's worth confirming. Boroughs like Camden and Hackney can add £30–£50 per van per day on top of the labour line.