Solar Panels: The Complete UK Guide
Solar panel costs, savings, battery storage, and everything you need to go solar in the UK.
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Solar panels turn sunlight into free electricity for your home, and yes, they work perfectly well in the UK (even on cloudy days, you'll generate useful power). A typical 4kW system costs £5,000-7,000, and there's 0% VAT on residential solar, which takes a decent chunk off the price. Worth knowing: that relief ends on 31 March 2027 and VAT goes back to 5% from 1 April 2027 (gov.uk VAT Notice 708/6), so a quote you sit on into next spring gets more expensive.
MCS certified 267,032 solar installations across the UK in 2025, beating the long-standing record set in 2011 by 31%. With energy prices staying stubbornly high, most homeowners see payback in 7-10 years, then 15 years or more of essentially free electricity after that. Our own ROI calculator puts a £6,000 4kW system at about £700 a year and roughly nine years, so treat the bottom of that range as the best case rather than the norm.
Bottom line
For most south- or south-east-facing UK roofs, fitting solar now is a clear yes.
A typical 4kW system pays for itself in 7 to 10 years and gives you another 15 to 18 years of essentially free daytime electricity after that. With 0% VAT keeping prices at their lowest in years, and that relief ending on 31 March 2027, the maths is the clearest it's been in a decade. The exceptions: heavily shaded or north-only roofs, listed buildings or conservation areas where you can't get permission, or homes you'll move out of within four or five years.
Solar systems at a glance
Typical figures for a UK roof with reasonable south-east to south-west orientation. Highlighted column is the most common pick.
| 3 kW | 4 kW | 6 kW | |
|---|---|---|---|
| Panels | 7-9 | 10-14 | 14-16 |
| Roof space | ~14 m² | ~20 m² | ~30 m² |
| Cost (incl. 0% VAT) | £4,000-5,500 | £5,000-7,000 | £7,000-9,000 |
| Annual generation | 2,500-2,800 kWh | 3,400-3,800 kWh | 5,000-5,500 kWh |
| Best for | 1-2 bed flat / small home | 3-bed semi | 4-bed+ detached |
Understand
Work out what your roof can do
Start here. Size the system from your usage and roof space, then run the calculator to get a payback estimate for your specific home. These are the two answers most people want before going any further.
GuideHow many panels does your home actually need?
How to size a system from your annual electricity usage and roof space, why bigger isn't always better with the export tariff, and the panel counts that suit each UK house type.
Read guideSolar panel ROI calculator
Estimate annual generation by UK region, savings from self-consumption, Smart Export Guarantee income and the payback period for your roof. Uses the current Ofgem price cap.
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Plan
Cost it and decide what to add
What a system actually costs to fit in 2026, whether to bolt on a battery, plus the format choice (tiles or standard panels) and pairing solar with a heat pump if you're already going down that road.
GuideWhat solar really costs in 2026
Full price breakdown by system size: panels, inverter, scaffolding, install. 0% VAT keeps a 4kW system around £5,000-7,000 fitted, until the relief ends on 31 March 2027.
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GuideShould you add a battery?
A 5kWh battery costs £2,500-4,000 and pushes self-consumption from around 45% to 75%, but it only pays back faster if you use most of your power in the evening. When the maths works and when it doesn't.
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Solar tiles vs solar panels
When tiles are worth two to three times the cost
Pairing solar with a heat pump
The combo that nearly zeroes your bills
Plug-in solar (renter-friendly, 800W cap)
Legal in the UK since April 2026: the new option for flats and balconies
Does solar add value to your home?
The resale premium, the EPC effect, and why leasing kills it
Choose
Pick panels and the kit around them
The brand and model decision matters less than people think (most panels are now 20%+ efficient) but the inverter, optimisers and monitoring choices make a real difference to lifetime yield.
GuideBest solar panels in the UK in 2026
The brands and models worth fitting, ranked by efficiency, warranty and real-world performance. Longi, JA Solar, Canadian Solar, Trina and Aiko, plus who to avoid now Maxeon has left the UK.
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GuideBest solar inverter UK 2026: top 6 picks
Fox ESS K-Series, SolarEdge Home Hub, Enphase IQ8, Fronius GEN24 and Sunsynk Ecco. Compared on warranty, efficiency and MCS status, with a note on what GivEnergy's administration means for its warranties.
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Act
Get the savings, then keep them
There's no headline grant in England, but 0% VAT and the Smart Export Guarantee are how the maths works. Once it's up and running, a bit of upkeep keeps the savings flowing for the next 25 years.
GuideSolar grants and 0% VAT, explained
There's no headline solar grant in England, but 0% VAT saves about £1,000 on a typical install until it ends on 31 March 2027, and the Smart Export Guarantee pays for what you don't use. Home Energy Scotland stopped funding standard solar PV in 2024, but Scottish homes still get the same 0% VAT and export payments.
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GuideKeep them generating: cleaning and care
Most UK roofs self-clean from rain, but bird mess, lichen and pollen can cost 5-10% of generation. When to clean, how often, and the safe way to do it without voiding warranties.
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Get started
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