UK solar panel guide — updated May 2025
Solar panels UK — costs, savings & the best panels for 2025
Honest prices, real savings data, and independent reviews of the top solar panels available to UK homeowners in 2025. Compare quotes from MCS-certified installers near you — completely free.
Get free solar quotesAre solar panels worth it in the UK in 2025?
Solar panels generate free electricity from daylight — not just direct sunlight — making them effective across the UK, including Scotland and the north of England. With electricity prices averaging around 24p per kWh in 2025, every unit you generate yourself is money you don't pay to your supplier.
A typical 4kW solar system installed in a south-facing UK home produces 3,400–3,800 kWh per year. If you use most of that electricity on-site — running appliances during the day, charging an EV, or pairing your system with a battery — you could realistically save £700–£900 per year. The Smart Export Guarantee adds further income for surplus electricity you export to the grid.
Payback periods on a well-designed UK solar installation now typically run 8–12 years, with panels warranted for 25–40 years. That means 15–30 years of near-free electricity after the initial outlay is recovered.
The critical factors are roof orientation, shading, system sizing, and — most importantly — choosing a quality MCS-certified installer. Our free comparison service handles all of that: answer a few questions, and we match you with up to three vetted local installers who will provide detailed, no-obligation quotes.
How My Energy Expert works
From your first question to your first panel — here's the process.
Tell us about your home
Answer a few quick questions — property type, roof direction, monthly energy bill. Takes about 3 minutes.
We match you with local installers
Our algorithm finds up to 3 MCS-certified installers in your area who cover your postcode and install your preferred technology.
Compare quotes and choose
Installers contact you with tailored quotes. Compare on price, brand, warranty, and reviews — then choose with no pressure.
Solar panel cost UK — 2025 price guide
Fully installed prices including panels, inverter, mounting hardware, labour, and commissioning. VAT at 0% applies to residential solar under current UK rules.
| System size | No. of panels | Annual output | Installed cost | Annual saving* |
|---|---|---|---|---|
| 3 kW | 6–8 | 2,600–2,900 kWh | £5,000–£6,500 | £600–£700 |
| 4 kW | 8–10 | 3,400–3,800 kWh | £6,500–£8,000 | £780–£900 |
| 5 kW | 10–12 | 4,250–4,750 kWh | £7,500–£9,500 | £980–£1,100 |
| 6 kW | 12–15 | 5,100–5,700 kWh | £9,000–£11,500 | £1,150–£1,300 |
* Annual savings based on 24p/kWh electricity price and approximately 50% self-consumption. South-facing roof, mid-England location. SEG export income not included.
Why install solar panels?
The financial and environmental case for residential solar in 2025.
Cut your electricity bills
A 4kW system can save £700–£900 per year at current energy prices, with savings rising as grid electricity becomes more expensive.
Earn from surplus energy
Export unused electricity to the grid via the Smart Export Guarantee and earn an additional 4–15p per kWh, depending on your energy supplier.
Reduce your carbon footprint
Each kW of solar installed offsets roughly 0.25 tonnes of CO₂ per year — a 4kW system eliminates around 1 tonne of carbon annually.
Add value to your home
Research suggests solar panels can add 1–4% to a property's value in the UK and make it more attractive to eco-conscious buyers.
Best solar panels available in the UK — 2025
Our independent review of the top-performing panels available through MCS-certified UK installers. Panel prices are per unit, ex-installation.
| Panel | Wattage | Efficiency | Cell type | Warranty | Price per panel | Best for |
|---|---|---|---|---|---|---|
SunPower Maxeon 7Top pick | 440 W | 22.8% | Maxeon Gen 7 | 40 years | £350–£420 | Maximum efficiency, limited roof space |
REC Alpha Pure RX | 430 W | 22.3% | HJT heterojunction | 25 years | £280–£340 | Premium performance, strong warranty |
Jinko Tiger Neo N-type | 420 W | 22.0% | N-type TOPCon | 30 years | £200–£260 | Best value for money at scale |
Q CELLS Q.Peak Duo ML-G10+ | 400 W | 21.4% | Mono PERC | 25 years | £180–£230 | Reliable mid-range option |
Panel prices are indicative trade prices per unit. Installed system costs differ significantly — see the cost table above. Specifications may vary by batch.
Ready to see how much solar could save you?
Answer 3 minutes of questions. We'll match you with up to 3 MCS-certified local installers — no cold calls, no obligation.
Get my free solar quotesFree · No obligation · MCS-certified installers only
Solar panel FAQs
How much do solar panels cost in the UK in 2025?
A typical 4kW solar panel system costs between £6,500 and £8,000 installed in the UK in 2025, including labour, inverter, and mounting hardware. Prices vary by system size, panel brand, roof complexity, and region. Larger 6kW systems typically cost £9,000–£11,500.
How much can solar panels save on my electricity bill?
A 4kW system in the UK generates around 3,400–3,800 kWh per year depending on location. At current electricity prices (around 24p/kWh in 2025), that's a potential saving of £816–£912 per year if you use most of the electricity yourself. Exporting surplus to the grid via the Smart Export Guarantee adds further income.
How long does solar panel installation take?
Most residential solar installations are completed in one to two days. The process includes scaffolding setup, roof mounting, panel fitting, inverter installation, and grid connection. The MCS-certified installer will handle all paperwork, DNO notification, and commissioning.
Do I need planning permission for solar panels in the UK?
In most cases, no. Solar panels on a standard residential roof fall under permitted development rights in England, Wales, and Scotland, meaning you do not need planning permission. Exceptions include listed buildings, conservation areas, and some flat roofs. Your installer will advise before fitting.
What is the Smart Export Guarantee (SEG)?
The Smart Export Guarantee is a UK government-backed scheme that requires larger energy suppliers to pay you for surplus electricity your solar panels export to the grid. SEG rates vary by supplier — typically 4p to 15p per kWh in 2025. You must have an MCS-certified installation to qualify.
What is the best direction for solar panels in the UK?
South-facing roofs at a 30–40 degree pitch produce the most energy in the UK — around 100% of optimal output. South-east and south-west orientations yield around 95% of optimal. Even east-west split arrays on a ridge roof can achieve 80–85% of optimal output and spread generation across more hours of the day.
Related guides
Solar panel grants and funding in 2025
The Warm Homes Plan, ECO4, and what other government support is available for UK homeowners this year.
Read guideHow to read your solar panel quote
What to look for in an installer's proposal — payback period, yield estimates, inverter specs, and the small print.
Read guideSolar panels and battery storage: should you combine them?
Adding a battery can double your self-consumption. We break down when the numbers stack up and when they don't.
Read guide