UK Plug-In Solar: The 2026 Rules Now in Force

Published: 2026-07-11 · Updated: 2026-09-29

Since 27 August 2026, plug-in solar can be legally connected to an ordinary socket in Great Britain. SI 2026/848 has made it legal to feed power into a socket since 27 August 2026, provided the kit meets DESNZ’s Interim Product Specification (version 2, published 16 July 2026). BS 7671 Amendment 4, published on 15 April 2026, recognised plug-in solar in the wiring rules. The previous edition of BS 7671 is withdrawn on 15 October 2026, and from then on all new electrical work is done to A4. Systems are capped at 800 VA inverter output and up to 2,000 W of panels, connected through a standard BS 1363 plug with a 5 A fuse. It is 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 and improves cloudy-day output), a fused standard plug, and no electrician for a compliant off-the-shelf kit. The compliance test is simple to state: the socket route covers only a complete kit whose exact model code is listed as Compliant on the ENA Connect Direct register under the Type “Plug-in Solar”. The specification defines the device as the whole kit (panels, inverter, factory-fitted lead and plug, and mounting system), and the register assesses kits, not inverters or brands.

Do you need to notify anyone?

There is no DNO pre-approval, so you do not wait for permission before installing. But you must notify your local DNO under G98 within 28 days of connecting the system. Ofgem approved the amended G98 rules on 11 August 2026; they allow one plug-in microgenerator per household. G98 covers any single-phase generator under 3.68 kW, which includes every 800 W plug-in kit. The notification is a short after-the-fact form, not an approval process, but it is a legal requirement, so don’t skip it.

Planning permission (England)

SI 2026/896 amended the permitted development rules for England, also from 27 August 2026. Most plug-in kits on a wall, balcony or in the garden need no planning application, with these exceptions:

• No timber. Nothing may go on a wooden wall, balcony, fence or enclosure, or on timber cladding.
• Listed buildings are excluded. So are scheduled monuments.
• Conservation areas and World Heritage Sites: panels may not go on a wall or balcony enclosure that fronts a highway.
• Protrusion: on a wall or balcony enclosure that abuts a highway, panels may stick out no more than 0.2 m (0.4 m elsewhere).
• Article 4 directions: a council can remove permitted development rights in a local area, and then you need an application.

Wales and Scotland have their own planning rules, so check with your council there.

Northern Ireland

The plug rules in SI 2026/848 apply UK-wide, but the part that makes using a plug-in generator lawful amends the Electricity Safety, Quality and Continuity Regulations, which cover Great Britain only. DESNZ says applying the specification to Northern Ireland is still under consideration. For now, the socket route described here does not cover Northern Ireland.

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

Single-panel kits (~450 Wp, south-facing) make about 380 kWh and save about £65 a year, so payback is about 5 years on a £336 kit and 7 years at £450.

Assumes 0.85 kWh per Wp a year, 65% self-consumption and 26p/kWh, which are the UK defaults in our payback calculator. Register-listed kits cost £336 to £989 when we checked prices on 29 September 2026: see the UK kit table. Enter your own kit price in the calculator. It starts at £500.

What to check before buying

1. The complete kit is on the register. The kit, with its exact model code, must be listed as Compliant on the ENA register under the Type Plug-in Solar, and it must meet the DESNZ specification. This is non-negotiable. Don’t take the seller’s word for it: check the register yourself. It takes three minutes, and the model code has to match.
2. Fused BS 1363 plug. This is UK-specific: kits imported from the EU with Schuko plugs need a proper UK version, not an adapter.
3. Mounting. UK balcony railings vary, and kits with adjustable non-drilling clamps fit most. No timber balconies or cladding.
4. Landlord/freeholder consent. The electrical rules don’t override lease terms, so railing-mounted panels usually need a quick written OK.

The market right now

When we pulled the ENA register on 29 September 2026, it held 124 Plug-in Solar records, 84 of them Compliant, from 32 manufacturers. That is up from 64 records and 56 Compliant on 16 September. The market is led by UK retailers and specialist brands rather than the big German and Chinese names. City Plumbing and Perlight have 13 Compliant kits each, then come Worldwide Solar (10), UKSOL (7), PatioSun and Zendure (6 each), with Octopus Energy and EcoFlow also listed. Kits with integrated battery storage are outside the socket route. Our register guide has the full breakdown, and the UK kit table lists where to buy a listed kit, with prices checked on 29 September 2026.

Primary sources: SI 2026/848 (Plugs and Sockets etc. (Safety) Regulations 1994 and Electricity Safety, Quality and Continuity Regulations 2002 (Amendment) Regulations 2026, in force 27 August 2026); DESNZ Plug-in Solar Device Interim Product Specification v2 (published 16 July 2026); SI 2026/896 (Town and Country Planning (General Permitted Development) (England) (Amendment) Order 2026); Ofgem decision on DCRP/MP/26/02 (11 August 2026); ENA Engineering Recommendation G98; BS 7671:2018+A4:2026. Reviewed monthly.