DIY solar

Plug-in solar becomes fully legal UK-wide from 27 August 2026, closing the grey area DIY kits sat in

Statutory Instrument 2026/848, made 16 July 2026 and in force from 27 August 2026, amends the 1994 Plugs and Sockets Regulations to formally permit certified plug-in solar kits up to 800W, ending years of DIY solar operating in a legal grey zone rather than a genuine prohibition.

13 August 2026 · Source: legislation.gov.uk

The change itself is narrower than some coverage suggests. SI 2026/848 amends the Plugs and Sockets etc. (Safety) Regulations 1994 and the Electricity Safety, Quality and Continuity Regulations 2002 to set a formal ceiling of 800 watts AC output for a plug-in microgenerator connecting through a standard socket, and requires the device to comply with the Plug-in Solar Device Interim Product Specification, version 2, published the same day the regulations were made. That's the sizing decision that already sits at the centre of the DIY plug-in route we sell in Herne Bay: the £499 kit is built to that envelope deliberately, not coincidentally.

What actually changes on the ground is less about whether you can do this at all, since UK households have been buying and self-installing plug-in kits for a couple of years already, and more about product certification and installer liability. From 27 August, a kit meeting the Interim Product Specification is unambiguously legal to sell and self-fit, which should mean wider retail availability rather than importing from specialist suppliers. DNO notification under G98 within 28 days of connecting still applies regardless of the new legislation, that part hasn't moved.

Worth flagging for anyone in the Herne Bay Conservation Area, which covers 41 Grade II listed buildings including Telford Terrace and the Hanover, Brunswick and Oxenden squares: this regulation governs the electrical product, not planning law. A fence, balcony rail or freestanding garden frame mount still avoids the building-alteration questions a roof-mounted MCS install can raise on a listed or conservation-area property, but that's existing planning guidance, not something SI 2026/848 changes. If your property is one of the 41 Grade II listed buildings rather than just within the conservation area boundary, checking with the council before mounting anything to the fabric of the building is still the right move.

Net effect for anyone weighing the two routes we offer: the DIY plug-in kit gets more clearly legitimate at exactly the size band it was already built around, while the case for a full MCS rooftop install, SEG export income, higher generation ceiling, doesn't change. For a Telford Terrace or square-facing property where a rooftop install would need extra sign-off, 27 August makes the plug-in route a genuinely simpler starting point.

Read the original: legislation.gov.uk. Commentary is Herne Bay Solar's own editorial view; the original reporting is credited to its publisher.

Get a free quote See MCS installs