Solar panels are more affordable than ever in the UK – but how much do they really cost in 2025? And what factors actually affect the price you’ll pay?
In this updated guide, we’ll break down average solar panel costs for UK homes, explain what influences the price, and show you how to cut your payback period with smart planning.
Key Takeaways:
- Most UK homes pay £5,000–£8,000 for a solar PV system (4–6kW).
- Costs vary by system size, roof type, battery storage, and installer.
- Grants and VAT exemptions can reduce your upfront bill.
- Battery storage adds £2,000–£6,000 but increases energy savings.
- Payback time is now as little as 7 years with the right setup.
How Much Do Solar Panels Cost in the UK?
| System Size | No. of Panels | Estimated Cost (No Battery) | Estimated Cost (With Battery) |
| 3kW | ~8 | £4,500 – £5,500 | £6,500 – £9,000 |
| 4kW | ~10 | £5,500 – £6,500 | £7,500 – £10,500 |
| 6kW | ~15 | £6,500 – £8,000 | £9,000 – £13,000 |
💡 Costs vary by location, panel type, roof complexity, and installer fees. Always compare quotes.
Check out our YouTube video review of the best solar panels in the UK:
What Affects Solar Panel Installation Costs?
- System Size – Larger systems cost more upfront but generate more electricity and shorten your payback time. A 6kW system might be overkill for a small home, but ideal for high-usage households or those with EVs.
- Roof Type & Access – Tiled roofs can need extra mounting gear. Flat or slate roofs, or properties with awkward access (like scaffolding or height issues), will cost more to install.
- Battery Storage – Adding a solar battery lets you store unused energy for later. This increases self-consumption and savings, but adds £2,000–£6,000 to the total.
- Inverter Choice – You’ll need an inverter to convert solar electricity to usable power. Standard string inverters are cheapest, but hybrid or microinverters cost more and offer better efficiency, particularly in shaded or complex roofs.
- Installer Reputation & Warranty – Big brands often charge more, but offer stronger warranties and better aftercare. Look for MCS-certified installers to qualify for the Smart Export Guarantee (SEG) and ensure quality standards.
- Add-ons (EV Chargers, Smart Monitors) – Want to track energy use or charge your electric car? Expect to pay more for add-ons like app monitoring, smart meters, or integrated EV chargers.
Can You Get Help With Costs?
Yes – here’s what’s available in 2025:
✅ 0% VAT on Solar Installations
Under the Energy Saving Materials scheme, you pay no VAT on solar panel systems for UK homes. This slashes costs by 5% (previous rate).
✅ ECO4 & LA Flex Grants
If you receive benefits or live in a low-income or cold home, you might qualify for government-funded upgrades. These are limited but worth checking via your local authority.
✅ SEG Payments
The Smart Export Guarantee pays you for unused electricity exported back to the grid. Rates range from 5p–15p/kWh depending on provider. Over a year, this could earn you £100–£200+.
✅ Financing Options
Many solar companies offer 0% finance or low-interest payment plans. This can spread the cost without large upfront payments, though always check for hidden fees.
Want to Save Money with Solar Panels?
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Read more: UK solar panel grants explained →
Related solar guides:
- How many solar panels do you need?
- Smart Export Guarantee
- Can you install solar panels in a conservation area?
- Best 4kw solar system with battery storage
- Sunshine hours map UK
- Best Solar Panels
- Solar panel output calculator
Are Solar Panels Worth It in 2025?
Absolutely – especially if you’re at home during the day or pair your system with battery storage.
Example Payback:
- A 4kW system costs £6,000 and generates ~3,400kWh/year.
- At 25p/kWh (typical UK electricity rate), that’s £850/year in offset bills.
- Subtract some export, and net savings are ~£700/year.
- Payback in ~7–8 years. After that, your savings are profit.
Battery storage extends the benefit. Instead of selling energy back at 5p/kWh and buying it later at 25p/kWh, you use your own power when needed.
How to Reduce Your Solar Panel Costs
- Compare Quotes: Don’t accept the first quote. Get at least three from MCS installers.
- Install Off-Season: Spring and summer are busy. You may get discounts in autumn or winter.
- Optimise System Size: Don’t overspend on extra panels you won’t use. Match size to actual energy use.
- Use High-Efficiency Panels: They’re more expensive per watt, but need less roof space and can improve output.
- Maximise Daytime Usage: Use appliances during sunlight hours to boost savings.
- Buy With a Friend or Neighbour: Some installers offer group discounts or referrals.
Should You Add Battery Storage?
Batteries aren’t essential, but they supercharge your system if you’re out during the day. Instead of exporting excess power, you store it and use it in the evening.
| Battery Size | Estimated Cost | Suitable For |
| 4-5kWh | £2,000–£3,500 | Small homes, part-day storage |
| 8-10kWh | £3,500–£6,000 | Medium homes, full evening use |
Final Thoughts on Solar Panel Costs UK
Solar panels aren’t just about cutting bills – they’re a long-term investment in energy independence.
With zero VAT, high energy prices, and SEG payments, the numbers stack up better than ever.
Whether you’re just starting to research or ready to install, it pays to get a personalised quote and plan smart.
Sources and References:
- https://www.statista.com/statistics/1304937/great-britain-reasons-for-cost-of-living-increase/
- https://energysavingtrust.org.uk/advice/solar-panels/
- https://www.ofgem.gov.uk/sites/default/files/docs/2020/02/seg_generator_guidance_-_final_for_publication.pdf
- https://www.gov.uk/government/statistics/solar-pv-cost-data