Balcony & Plug-in Solar in the UK (2026)
For years, the German-style "balcony solar", a couple of panels you hang off a railing and plug in, sat in a UK legal grey area. That changed in April 2026. Plug-in solar up to 800W is now legal, opening solar up to the millions of people in flats and rented homes who could never put panels on a roof. Here's exactly where the rules stand, what to buy, and whether it's worth it.
The law: what changed in 2026
The key change is BS 7671 Amendment 4 (the IET Wiring Regulations), ratified on 16 March 2026 and in force from 15 April 2026. It carves out certified plug-in solar up to 800W of inverter output. Key dates:
- 15 April 2026, Amendment 4 comes into force; 800W plug-in solar is legal.
- ~July 2026, the British Standards Institution is finalising a dedicated product safety standard for plug-in solar, expected to enable fully certified plug-and-play DIY kits.
- 15 October 2026, end of the transition period; Amendment 4 becomes mandatory for all new installations.
The practical position through mid-2026: an 800W system is clearly legal when hard-wired by a registered electrician to a dedicated circuit. True "plug it into a wall socket yourself" DIY is arriving with the BSI product standard and certified kits, check the current status before buying if plug-and-play with no electrician is your goal.
Do I need to notify the DNO?
Yes. Any grid-connected system, plug-in included, must be notified to your Distribution Network Operator under G98. It's a quick online form (a notification, not an approval gate) submitted within 28 days of installation. Skipping it leaves you non-compliant. Find your DNO at energynetworks.org.
How much power, and money, does it make?
The legal cap is 800W of inverter output. The standard build is two 400–440W panels feeding an 800W micro-inverter. In UK conditions that generates roughly 600–900 kWh a year. If you use most of it during the day (fridge, router, standby loads, working from home), that's about £150–£220 a year at a 24.5p tariff, so a £400–£650 kit pays back in around 3–4 years, then keeps saving for another 20.
The catch: with no battery, power you don't use as it's generated is exported (and plug-in kits usually can't claim SEG), so daytime self-consumption is everything. Run your dishwasher and washing on a timer for midday and the numbers improve.
What to buy, best balcony solar kits
A typical kit includes two panels, an 800W micro-inverter, a railing/wall mounting bracket, and the connection cable. Look for a micro-inverter with a valid UK G98 grid-code certificate and, once available, a kit certified to the new BSI plug-in standard.
- Standard 800W balcony kit, 2 rigid panels + 800W micro-inverter + rail brackets. £400–650. Browse 800W balcony kits on Amazon →
- Flexible / lightweight panels, for glass balustrades or weight-limited balconies. Browse flexible panels →
- Add a plug-in battery, small stackable batteries let you store midday surplus for the evening, hugely improving payback. Browse balcony solar batteries →
Who is balcony solar for?
- Flat dwellers with a balcony, railing or a sunny external wall.
- Renters, it doesn't touch the roof and comes with you when you move (check your tenancy and, in a leasehold flat, any building management rules on attaching equipment).
- Homeowners wanting a low-commitment start before a full roof system, or extra generation on a garden wall, shed or fence.
If you own your roof, a full system will always generate far more, see our best DIY solar kits and installation guide. Balcony solar is about access, not maximum output.
Thinking bigger than a balcony?
If you have roof access, our calculator shows what a full system would save you.
Open the solar calculator →Frequently asked questions
Is balcony solar legal in the UK?
Yes. Plug-in balcony solar up to 800W became legal under BS 7671 Amendment 4 (ratified 16 March 2026, in force from 15 April 2026, transition ending 15 October 2026). In mid-2026 an 800W system is legal when hard-wired by a registered electrician; a dedicated BSI product safety standard (expected around July 2026) is set to enable fully certified plug-and-play DIY kits.
How much power can a UK balcony solar system produce?
The legal inverter output limit is 800W. Two 400–440W panels feeding an 800W micro-inverter is the standard setup and typically generates 600–900 kWh a year in the UK, worth roughly £150–£220 on a 24.5p tariff if you use most of it during the day.
Do I need to tell my DNO about balcony solar?
Yes. Any grid-connected system, including plug-in solar, must be notified to your DNO under G98, a quick online form (notification, not approval) submitted within 28 days of installation.
Can renters use balcony solar?
Yes, that's the main appeal. Plug-in kits mount on a balcony rail or wall without roof work and move with you. Check your tenancy agreement and, in a flat, any leaseholder or building-management rules on attaching equipment to the exterior.