Plug-in solar in Liverpool: what the 2026 rules allow

What the 2026 regulations allow

Two pieces of law changed on 27 August 2026. The first, SI 2026/848, amended the Plugs and Sockets etc. (Safety) Regulations 1994 and the Electricity Safety, Quality and Continuity Regulations 2002 to make room for what it calls a plug-in microgenerator (SI 2026/848). To fit the definition, a kit must:

• turn sunlight directly into electricity;
• have a maximum rated output, in alternating current, of no more than 800 W;
• be meant to connect to a home's wiring through a standard plug and socket, running alongside the mains;
• not be designed to draw power from the house to store and give back later, beyond the control functions the specification allows.

It must also comply with the government's Plug-in Solar Device Interim Product Specification, published alongside the regulations, and the regulations' explanatory note says a device must not be installed or used unless it does. In practice that means buying a kit whose seller states, in writing, that it meets that specification. A home-made rig, or a kit sold for another country's rules with no such statement, is not covered, and neither is a product designed to charge a battery from your sockets.

The limit applies to the kit's rated output in alternating current, the form your sockets use, so check the AC figure on the specification sheet rather than the wattage printed on the panels. None of this changes the rules for roof panels fitted by an installer, which follow the separate MCS and G98 routes.

Permitted development, with a timber exception

The second change came from SI 2026/896, which rewrote the permitted development rules for solar on homes from the same date and brought plug-in solar into them (SI 2026/896). For both houses and blocks of flats, fixing a kit to the building needs no planning application, with one exception: it is not permitted development where any part of the kit would be installed on a wooden wall, balcony or enclosure, or on any part of the outside of the building that is clad in timber.

The Planning Portal says the timber rule is there to reduce fire risk (Planning Portal). So a kit on a brick back wall or a metal balcony rail can fall within the rules, while the same kit on a timber-framed balcony, a wooden balcony screen or a shiplap-clad extension does not. If you are unsure what a surface is made of, treat it as timber until you know otherwise. The general conditions for solar on homes apply as well: site the kit so its effect on the look of the building is as small as practicable, and take it down once it is no longer needed.

Listed buildings are outside all of this. A block of flats that is listed is excluded from the solar permitted development rules altogether, and work affecting the character of a listed house needs listed building consent, so ask the council before fixing anything to one. The planning page sets out the full national limits.

Article 4 streets and conservation areas

Liverpool has 36 conservation areas (Liverpool City Council), and the council says most of them are covered by Article 4 directions. For houses, those directions bring roof alterations, windows and doors, external cladding and some boundary features under planning control. In Kensington Fields, Knotty Ash, Toxteth Park and the Avenues, they apply only to elevations that face a highway; elsewhere they apply to every elevation (Article 4 directions).

The council's page does not mention solar, let alone plug-in kits. If your home is in one of these areas, ask the planning team before fixing a kit to any wall, and above all to the front of the house; in the four highway-only areas, a wall facing the street is exactly what the direction covers. A kit at the back, out of public view, is likely to be the easier case, but the council decides, not this guide. Keep the council's answer in writing with the kit's paperwork; it will help if you come to sell.

Leases, tenancies and the building's owner

Planning permission is one question; the owner's permission is another. 26.1% of Liverpool households rent from a private landlord and 26.4% from a social landlord (ONS Census 2021), and tenancies commonly restrict fixing things to the walls or the outside of the building without consent. Get the landlord's agreement in writing before drilling anything; the guide to renting and solar suggests how to ask.

Leaseholders face the same question in a different form. The outside walls of a block, and sometimes the balconies, usually belong to the freeholder, and leases often say what can be attached to rails, walls and windows. Ask the managing agent before buying, and expect fire safety to be its first question; the guide to flats and apartments explains who decides what. A kit you own outright is portable, so if you move, it can go with you. Whoever you are, it is worth telling your home insurer, as you would for any change to the electrics.

What a kit would make in Liverpool

The PVGIS runs behind this guide cover panels from lying flat up to a tilt of 50°, but not panels standing upright. A kit hung against a wall or a balcony rail sits close to vertical, and this guide has no PVGIS figure for that position. What the data does show is the trend: for a south-facing panel, output peaks at about 40° (968 kWh per kW) and is already falling at 50° (958). Treat the table below as the upper end for a kit, reached only when it is tilted back on a frame.

The figures treat a kit as 0.8 kW of panels, its maximum, at the PVGIS figures for central Liverpool (PVGIS 5.3). Facing south at 35°, that is about 772 kWh a year; west, 613; east, 599; north, just 408. Lying flat, on the ground or a low frame, it would make 639, more than east or west at 35°. The right-hand column compares each with Ofgem's typical household use of 2,500 kWh a year (Ofgem), but it shows what the kit makes, not what it replaces.

The difference matters because a plug-in kit only helps while something in the house is running. On a south-facing kit at 35°, output ranges from about 22 kWh in December to 95 kWh in June (our arithmetic), and most of it arrives around midday. Whatever the fridge, the router and anything else running cannot use flows out to the grid, and an export tariff needs the installation and the installer to be MCS-certified (GOV.UK), which a kit you plug in yourself is unlikely to be. The guide to export payments sets out the rules.

Shade matters more than direction for something this small. A yard wall, a neighbour's extension or a tree that shades the panel for part of the day will pull its output down, and the PVGIS figures assume none. On a narrow terraced street, watch where the sun actually falls across a day before choosing a spot.

Before you buy

• The specification. Get written confirmation that the kit meets the Plug-in Solar Device Interim Product Specification.
• The surface. Not a wooden wall, balcony or enclosure, and not timber cladding.
• The street. In a conservation area with an Article 4 direction, or on a listed building, ask the council first.
• The owner. Written consent from the landlord or freeholder if you do not own the building outright.
• The fixing. Brackets or a frame that suit the position: a balcony several floors up catches far more wind than a sheltered back yard.
• The socket. Follow the maker's instructions on where and how it connects, and if you are unsure about your wiring, ask a registered electrician.
• The network. Ask the seller whether SP Energy Networks needs to be told about the kit; the guide to SP Energy Networks and your panels explains how roof systems are notified.

A plug-in kit is a small step, not a substitute for a roof system. A south-facing roof that takes several kW will make many times as much; the rooftop estimator shows the figures for your roof, and the cost page shows what North West homes paid per kW for roof systems.