Is plug-in solar legal in the UK?
Yes, in Great Britain, if the kit and the way it is fitted meet the conditions that apply. Legal in general is not the same as legal at your address.
The short answer
Plugging a solar kit into a domestic socket is now allowed in Great Britain. The permission is conditional. It covers particular kinds of kit, fitted in particular ways, connected in particular ways. If your installation falls outside those conditions it is not covered, even though plug-in solar as a category is permitted.
Northern Ireland has its own rules. If you are in Northern Ireland, check locally before you buy.
The change took effect on 27 August 2026 under SI 2026/848, made on 16 July 2026 and laid before Parliament on 17 July 2026.
Before that, the obstacle was narrow. BS 1363 does not allow a plug and socket to be used to connect generating equipment, which is why an otherwise safe kit could not lawfully be plugged in. The new regulations let a notified body approve a plug for a plug-in solar device despite that one restriction, provided the plug conforms to BS 1363 in every other respect and the device meets the Interim Product Specification.
The regulations also changed the electricity safety rules so that a plug-in microgenerator is judged against the specification rather than against the wiring rules written for fixed installations.
Source: SI 2026/848 as made, regulations 1 to 3 and the Explanatory Note, legislation.gov.uk.
What the conditions cover
There are four groups of conditions. Each one can rule out an installation on its own.
- The kit. Its rating, its inverter, and the safety standards it is built and tested to. No more than 800 VA and 3.5 A out of the inverter, and no more than 2,000 W of panels behind it, across at most four modules with no more than two in series.
- The connection. How it plugs in, what kind of socket, and whether an extension lead or adaptor is allowed. It is not.
- The mounting. What the panel is fixed to, how high, and what wind load the fixing has to survive. There is no national number here. The manufacturer sets the maximum height above ground and states it in the instructions, based on UK wind and snow loading.
- Notification. Whether anyone has to be told, and by whom. Yes. Telling your distribution network operator about connection and disconnection is mandatory, and the kit has to carry that statement and a link to the process.
What being legal does not settle
The law says the installation is allowed. It does not say anyone has to let you do it at your property.
If you rent, your tenancy agreement usually stops you making external alterations without the landlord's written consent. Ask before you buy.
If you own a flat, your lease almost certainly treats anything fixed to the outside of the building as an alteration to the freeholder's property. You need the freeholder's or managing agent's written consent, and you should tell your buildings insurer. Some blocks refuse as a matter of policy, particularly where fire-safety work is under way.
If your home is listed or in a conservation area, planning rules may apply to anything visible from the street. Ask your local planning department.
What to do before you buy
- Work out exactly where the panel would go, and what that surface is made of.
- Check a socket is reachable from that spot with the cable supplied.
- Get written consent if you rent or the building is shared.
- Ask the seller for the compliance documents in writing. If they cannot produce them, buy elsewhere.