UK Plug-In Solar Is Now Legal: The 2026 Rules Explained
Since 15 April 2026, plug-in solar is legal in the UK. BS 7671 Amendment 4 allows systems with up to 800 VA inverter output and up to 2,000 W of panels, connected through a standard BS 1363 plug with a 5 A fuse — the same framework that put over a million systems on German balconies. Here is what UK residents need to know.
What exactly is allowed
The UK rules mirror the German model almost point for point: a micro-inverter capped at 800 VA, panel capacity up to 2,000 Wp (overpaneling is explicitly fine — it improves cloudy-day output), a fused standard plug, and no requirement for an electrician for a compliant off-the-shelf kit. The system must be G98-compliant, which any kit sold for the UK market should state.
Why this matters more in the UK than anywhere else
Roughly one in five UK households rents, and millions more live in flats where rooftop solar was never an option. Plug-in solar is the first self-generation technology available to this group. With UK electricity among the most expensive in Europe (~26p/kWh in mid-2026), payback periods are competitive with Germany despite less sun.
Realistic UK numbers
| Setup | Annual output | Annual saving | Payback |
|---|---|---|---|
| 800 Wp south-facing, London | ~680 kWh | ~£125 | ~3.8 yrs |
| 800 Wp east/west, Manchester | ~540 kWh | ~£100 | ~4.7 yrs |
| 450 Wp single panel, south | ~380 kWh | ~£70 | ~4.2 yrs |
Assumes a £450–480 kit and 65% self-consumption. Run your own case in the payback calculator.
What to check before buying
- G98 compliance — stated in the listing; non-negotiable.
- Fused BS 1363 plug — UK-specific; kits imported from the EU with Schuko plugs need a proper UK version, not an adapter.
- Mounting — UK balcony railings vary; kits with adjustable non-drilling clamps fit most.
- Landlord/freeholder consent — the electrical rules don’t override lease terms; railing-mounted panels usually need a quick written OK.
The market right now
Because legalisation is recent, the UK market is months old: mostly German and Chinese brands shipping UK-plug versions. Expect prices to fall and choice to widen through 2026–27 as UK-specific kits launch. Our kit comparison tracks what’s actually available in the UK and is updated monthly.
Primary source: BS 7671:2018+A4:2026. Reviewed monthly.
Frequently asked questions
When did plug-in solar become legal in the UK?
BS 7671 Amendment 4 took effect on 15 April 2026, permitting plug-in solar systems up to 800 VA inverter output with up to 2,000 W of panels, connected via a fused BS 1363 plug.
Do I need to tell my energy supplier or DNO?
Compliant plug-in systems under the 2026 rules do not require DNO pre-approval. Check your kit is G98-compliant — reputable sellers state this explicitly.
How much can UK balcony solar save per year?
A south-facing 800 Wp system in southern England produces roughly 650–700 kWh a year. At around 26p/kWh and typical self-consumption, that is £110–150 per year, giving a 3.5–5 year payback on a £450 kit.