Solar Panels on a Shed: UK Rules, Costs & What They Can Power

A garden shed might not be the first place you think of for solar panels, but as a site for a small off-grid system it is hard to beat. The roof is south-facing, unshaded, and away from the house — and powering a workshop without running a buried cable from the main consumer unit is genuinely useful. Most shed solar setups are permitted development, require no planning permission, and can be installed as a DIY kit in a weekend afternoon. Here is what you need to know before you buy.

Do you need planning permission?

Usually not. Rooftop solar on a garden shed is covered by Class A, Schedule 2, Part 14 of the Town and Country Planning (General Permitted Development) Order 2015 (GPDO). The legislation explicitly covers solar on “a building situated within the curtilage of a dwellinghouse” — which includes sheds, garages, and any other outbuilding in your garden. See our full guide to solar panel planning permission for the complete picture.

Two conditions apply to stay within permitted development:

• Panels must not protrude more than 0.2 metres beyond the plane of the roof slope.
• The installation must be sited to minimise its effect on the appearance of the building, so far as practicable.

There are three situations where PD rights do not apply:

• Listed buildings: solar is not permitted on any outbuilding within the curtilage of a listed dwelling — full planning consent is required.
• Conservation areas: panels on a shed wall that directly faces a highway are not PD; roof-mounted panels usually are.
• Article 4 Directions: some local authorities have removed PD rights for solar in specific streets or areas. Check with your local planning authority if you are unsure.

If you prefer a freestanding ground-mounted array in the garden rather than panels on the shed roof, Class B of the same order permits one installation per curtilage with a maximum panel area of 9 m², height of 4 metres, and a 5-metre setback from any boundary.

How many panels fit on a shed roof?

A standard residential solar panel in 2026 measures roughly 1.72 m × 1.13 m and produces 425–460 W. Compact panels (around 1.5 m × 0.7 m, 250–310 W) suit smaller sheds better. Allow around 30 cm clearance from all edges for drainage, airflow, and cable runs.

A pitched shed roof adds usable area, but focus panels on the south-facing slope — a north-facing slope contributes 50–60% less output in the UK.

What can shed solar power?

A 400 W – 1.2 kW system with battery storage handles everyday workshop needs comfortably. Loads that work well at this scale:

• LED lighting — a full set of LED strips or work lights draws well under 100 W total
• Phone, tablet, and laptop charging — continuous and trivial to sustain
• Power tools — drills, circular saws, and sanders peak at 500–1,500 W but run in short bursts; a battery with a good inverter handles the surge current
• Small fridge — an A++-rated under-counter fridge uses around 0.5–1 kWh per day; achievable on a reasonable solar day with 350 W and at least 100 Ah of battery capacity
• Security camera and Wi-Fi extender — low draw, suits even a single-panel system

What shed solar is not well suited to: electric heaters, kettles, and high-draw appliances. A 2–3 kW heating element will exhaust a small battery in under an hour. For meaningful EV trickle charging you would need at least 3–5 kWh of storage, which is feasible on a larger shed but a niche application.

Off-grid or grid-tied?

Most shed solar is off-grid, and for most people that is the right choice. A standalone off-grid system — panels, MPPT charge controller, battery, and inverter — keeps things simple. There is no notification requirement to your Distribution Network Operator, no Part P electrical certification for the solar elements, and no grid connection cost. You size the system to your usage, and the battery keeps things running after dark.

Grid-tied shed solar (connecting the inverter back into your house consumer unit) is technically possible and allows you to export surplus electricity and earn Smart Export Guarantee payments. But it triggers several requirements: G98 notification to your DNO within 28 days of commissioning, Part P Building Regulations compliance, an MCS-certified installer, and a SMETS2 smart meter. For a 400 W–1.6 kW system the added overhead is rarely worth it — SEG payments on that output will be modest, and the installation and certification costs are proportionately large. Our guide to DNO applications and G98 notification explains the process if you go down this route.

How much does it cost?

DIY off-grid kits start around £600 for a 350 W system including battery and inverter. A typical kit — two panels, an MPPT charge controller, 500 W inverter, and two 100 Ah leisure batteries — costs around £600–£770. Opting for LiFePO4 lithium cells instead of lead-acid pushes that to roughly £1,345 but gives better cycle life and usable capacity. Note that solar panels bought separately for DIY installation attract 20% VAT.

Professional supply-and-install costs scale with system size. A 1 kW grid-tied shed installation runs roughly £1,500–£3,000; a typical 700 W–2 kW shed range falls between £2,000 and £6,000. A combined supply-and-install contract from a single installer qualifies for 0% VAT until 31 March 2027 under HMRC VAT Notice 708/6, which explicitly covers panels installed on “outbuildings of a domestic property.” The rate reverts to 5% from 1 April 2027.