Plug-in and balcony solar for flats on the Wirral

Who this is for

The 2021 Census found 17.5% of Wirral households living in a flat or maisonette: 11.9% in purpose-built blocks, 3.9% in converted or shared houses and the rest in other converted buildings or above shops. Add the private tenants in houses, 18.9% of households, and a large part of the peninsula cannot simply decide to put panels on a roof. Plug-in solar is aimed at them.

What changed in August 2026

New regulations that came into force on 27 August 2026 allow plug-in solar devices with a maximum output of 800 watts of alternating current to be connected through a standard socket. The same day, the national planning rules for solar on walls and balconies were rewritten. In outline:

• a plug-in device is a small solar panel kit, without a battery, that plugs into an ordinary household socket;
• its output is capped at 800 watts;
• the government intends guidance to cover notifying the network operator, how devices are mounted, and no more than one device on each circuit;
• it has said that renters, leaseholders and people in managed buildings should get any permissions they need before installing one;
• plug-in panels must not be fixed to a wooden fence, gate, wall or other enclosure in a garden.

The rules are new and product guidance is still being finished, so buy from a seller who can show which product specification the device meets, and read the instructions on how many devices a circuit can take.

What a balcony panel makes on the Wirral

Panels hung on a balcony rail or wall are usually vertical, which is not their best angle. We asked PVGIS what a vertical panel makes on the Birkenhead side of the peninsula:

PVGIS 5.3, 53.39° N 3.035° W, panels at 90°, 14% losses, read 3 November 2026. The 800 W column assumes the panels add up to 0.8 kW.

A vertical south-facing panel makes about three quarters of what the same panel would make on a south roof at 35°, but it does unusually well in winter: in December it makes more than a tilted roof panel, because the low sun strikes it almost head-on. East and west balconies make much less, especially in winter.

All of a plug-in device's output is used in the flat while something is running, since it has no battery and no export arrangement. If the fridge, router and a few appliances are on in the day, most of a small device's output will be used. At the average price-cap unit rate of 26.32p per kWh (October to December 2026), each 100 kWh used in place of grid power is worth about £26.

Permissions you will need

• Leaseholders: your lease probably controls alterations to the outside of the building, including balconies. Ask the freeholder or management company in writing.
• Tenants: ask your landlord in writing. A plug-in device is removable, but fixing it to the building is still an alteration.
• Conservation areas: in any of Wirral's 26 conservation areas, panels on a wall or balcony that faces the road are not permitted development. Several of them are on or near the coast. See conservation areas.
• Listed buildings: anything fixed to a listed building needs listed building consent.

Coastal flats

Seafront flats in New Brighton, Wallasey, Hoylake and West Kirby face the same salt and wind as seafront roofs, and a balcony rail is a more exposed place than most roofs. Make sure the mounting is rated for wind and fixed so it cannot come loose, use stainless fixings, and check the product's instructions for coastal use. A panel that blows off a balcony is a danger to people below.

The city region's planned pilot

In September 2026 the Liverpool City Region Combined Authority said it plans a £5 million plug-in solar pilot aimed at owner-occupier households in fuel poverty, subject to approval from the Department for Energy Security and Net Zero, with delivery expected by July 2027. It is not open, and we do not know how households will be chosen. When it opens it will be announced by the Combined Authority.

Is it worth it?

A plug-in device is small, and its value is correspondingly modest: a few hundred kWh a year. It suits a south-facing balcony where someone is home in the day, and it is portable if you move. It is not a substitute for a roof system on a house, which makes several times as much. If your block's freeholder is interested in panels on the shared roof, that is a building-wide project to raise with them; the planning guide covers blocks of flats.