For years, connecting a solar panel to a standard UK wall socket sat in a regulatory grey area. Technically, the wiring rules did not permit it. That changed on 15 April 2026, when BS 7671 Amendment 4 came into force, creating a legal framework for plug-in solar systems in UK homes for the first time.
So what does that actually mean for you?
What changed on 15 April 2026
The Institution of Engineering and Technology published Amendment 4 to the UK wiring regulations (BS 7671), which introduced a new chapter covering small plug-in generator systems connected to a domestic supply. This is the legal foundation that makes plug-in solar possible in UK homes.
Before this update, connecting any power-generating equipment to a standard 13A socket was not covered by the regulations. Homeowners who wanted to use plug-in solar legally had to hire an electrician to wire the system directly into their consumer unit, which added cost and complexity and defeated much of the appeal.
The 800W limit
The regulations cap plug-in solar systems at 800 watts. This matches the standard already in place across much of Europe and reflects the safe limit for a standard UK ring main circuit. In practical terms, a typical kit with two 400W panels sits right at this limit and is designed to work within it.
You still need to notify your network operator
Even with the new rules in place, you are required to notify your District Network Operator (DNO) before connecting a plug-in solar system. This is done under G98 regulations and is usually a straightforward online process. The notification helps the local grid operator keep track of small generators connected to the network. Most kit suppliers will walk you through this as part of the setup process.
What is still to come
The wiring rule change is one part of the puzzle. A separate product safety standard, being developed by the British Standards Institution (BSI), is expected around July 2026. This standard will certify specific kits for full self-installation via a standard plug. Until it is published, the technically compliant route for connecting a new system is still through a registered electrician. Once the BSI standard lands, fully certified DIY kits should start appearing on shelves at retailers including Lidl, Amazon and Iceland.
What this means in practice
If you already own a plug-in solar kit, or are thinking of buying one now, the situation is moving fast. The legal direction is clear, the wiring rules are updated, and retailers are preparing stock. For most people, the sensible approach is to wait for the BSI-certified kits expected this summer, which will give you a complete, legal, self-install solution with no need to call an electrician.
For anyone who cannot wait, or who wants to use a kit they already own, having the system connected by a CPS-registered electrician remains the fully compliant route today.