Plug-In Solar in London

Is plug-in solar legal in London?

Yes. UK wiring regulations (BS 7671 Amendment 4, published April 2026) now formally permit sub-800W plug-in solar connections to standard domestic sockets. This applies nationwide, including London. The BSI product standard that will certify specific kits for DIY self-installation is expected in July 2026. Until then, a CPS-registered electrician makes the final connection — typically for £250–£450.

For renters in London: the Renters' Rights Act 2025 means your landlord cannot unreasonably refuse a portable plug-in system that requires no permanent structural work. See our full renter's guide for how to approach this conversation.

London solar performance

London has the highest proportion of renter households of any UK region — around 50% of the capital's housing stock is privately rented. It's also the largest market for plug-in solar in the UK, both because of renter density and because London properties tend to have reasonable south-facing exposure despite the urban environment.

PVGIS data (EU JRC satellite irradiance database) puts London's average annual solar irradiance at approximately 961 kWh/kWp for a south-facing system at 35° tilt — the optimal angle for a static installation in the UK. Applied to an 800W system with a 0.85 system efficiency factor, this produces approximately 653 kWh per year.

Summer months (May–August) account for roughly 60% of London's annual solar generation. June is peak month, with irradiance values 4–5× higher than December. An 800W system in London will generate approximately 100–130 kWh in June and as little as 20–30 kWh in December. For home-workers or remote workers, consumption timing generally aligns well with generation.

London's urban heat island effect means temperatures slightly above the national average, which can marginally reduce panel efficiency at peak summer temperatures — but this effect is small (around 2–3%) and well within normal variation.

What if my panels don't face south?

South-facing is optimal, but it's rarely a dealbreaker. East or west-facing panels produce approximately 80% of the south-facing figure — around 522 kWh/year in London, saving roughly £136/year. North-facing produces around 60% — still generating electricity, just with a longer payback period of around 7.3 years.

If you're on a high floor with an unobstructed view, east-west performance can be very good. The key variable is shading: a south-facing panel in partial shade will often underperform a west-facing panel with a clear skyline.

Your DNO: UK Power Networks

London is served by UK Power Networks. Under G98, you (or your CPS electrician) must notify UK Power Networks within 28 days of connecting your system to the grid. This is the "connect and notify" rule — you don't need approval before connecting, just notification after.

To submit your G98 notification to UK Power Networks, visit: ukpowernetworks.co.uk/connections. You'll need your address, MPAN (on your electricity bill), the installer's CPS registration number, and the inverter's G98 certificate number (included in your kit's documentation).

For more detail on the full G98 process, see our G98 / DNO notification guide.

Renting in London

London renters face a specific challenge: many purpose-built flat developments have shared roof access and restricted balconies. The most practical mounting for London renters is a balcony rail clamp system, which fits most iron and steel railing profiles common in Victorian conversions and post-war estates. Ground-floor and garden flat tenants often have the easiest access for a freestanding ground frame.

The practical path for renters is: get a portable ground frame or balcony rail clamp mounting (no drilling), order the kit, have a CPS electrician make the connection, and notify UK Power Networks within 28 days. When you move, take it all with you and re-notify the new DNO at your next address.

Costs and what to budget

After the BSI product standard is published in July 2026, certified kits will be self-installable, removing the electrician cost. A typical 800W kit may then be installable for £529–£579 all-in, reducing payback to around 3–3.5 years in London.

Questions specific to London

• How much does a plug-in solar kit save in London?
  Based on PVGIS irradiance data for London and a south-facing 800W system, approximately £170 per year at the April 2026 rate of 26p/kWh. East or west-facing installations save around £136–£153/year.
• Which DNO covers London?
  UK Power Networks is the Distribution Network Operator for London. You notify them — not your electricity supplier — within 28 days of connecting your system. Visit ukpowernetworks.co.uk/connections to submit your G98 notification.
• Can I install plug-in solar in a rented flat?
  Yes. The Renters' Rights Act 2025 means your landlord cannot unreasonably refuse a portable plug-in system. A no-drill balcony rail mount or freestanding ground frame leaves no permanent marks and moves with you when you leave. See our renter's guide for the full approach.
• Do I need planning permission?
  No. Plug-in solar panels of this type are permitted development and do not require planning permission under current UK rules, as long as you're not in a listed building or conservation area with specific restrictions. If your property has these designations, check with your local planning authority first.

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