From 27 August 2026, a defined class of plug-in solar system can be lawfully installed in Great Britain. That is the opening, not the whole story.
The change is deliberately narrow
The government has created a route for small systems with inverter capacity no greater than 800VA. This is the inverter limit, not necessarily the sum printed on every panel label.
Equipment must meet the interim product specification. The installation and registration process also have to fit the new route.
“Plug-in” describes the connection idea. It does not remove the need for electrical protection, product evidence or network visibility.
Four checks matter
First, confirm the inverter’s apparent-power rating. Second, identify the exact connection unit and circuit requirements. Third, confirm who registers the installation. Fourth, check the proposed mounting position against planning limits.
The 2026 planning amendment does not extend the new permission to wooden fences, gates or walls. Flats, leaseholds and listed buildings may introduce further consent questions.
Batteries are not included
The interim plug-in solar specification excludes electrical energy storage. A small battery may look like the natural sequel, but its legal route and date remain separate.
Our buying rule
Do not rely on a marketplace title or a CE mark shown without context. Ask for the model number, conformity evidence, register position and installation instructions before paying.
We will apply the same gate to every product offered here. Until that evidence is complete, this remains a research and planning site.