How Much Do Solar Panels Cost in the UK in 2026?
Solar panels cost between £5,000 and £13,000 in the UK in 2026, depending on system size. A typical 3.5kWp system costs around £6,100 (Energy Saving Trust), while a larger 6kW system with battery storage costs £10,000–£13,000. Residential solar installations are VAT-free until March 2027.
Quick answer
A typical 4kW system costs £5,000–£7,000 installed with 0% VAT. Add a battery and you're looking at £8,000–£13,000. Prices have fallen roughly 50% over the past decade while electricity costs have risen significantly — making the payback period shorter than ever. Get a personalised estimate →
Solar panel pricing in the UK is surprisingly opaque. Most websites give broad ranges without explaining what drives the difference between the low and high end. This guide breaks down exactly what you're paying for.
Solar panel costs by system size
System size is measured in kilowatts peak (kWp) — the maximum output under ideal conditions. Here's what each size costs in 2026, including installation:
| System Size | Panels | Cost (inc. install) | Best For |
|---|---|---|---|
| 3kW | 8 panels | £4,000–£5,500 | Small homes, 1-2 people |
| 4kW ⭐ | 10 panels | £5,000–£7,000 | Average UK home, 2-3 bed |
| 5kW | 12-13 panels | £6,000–£8,000 | Larger homes, 3-4 bed |
| 6kW | 15 panels | £7,000–£9,000 | Large homes, 4+ bed or EV |
| 8kW | 20 panels | £9,000–£12,000 | Large detached, high usage |
Prices include installation, 0% VAT, standard scaffolding, and all electrical work. Based on 400W monocrystalline panels. Source: Energy Saving Trust + installer survey data, February 2026.
The 4kW system is the most popular choice for UK homes. It covers most of the electricity needs of a typical 2-3 bedroom house and fits comfortably on a standard roof.
What's included in the price?
A solar installation quote should include everything needed to get your system generating. Here's the breakdown:
| Component | Cost (4kW system) | Notes |
|---|---|---|
| Solar panels | £2,000–£3,000 | 10× 400W monocrystalline |
| Inverter | £500–£1,000 | String or hybrid (if adding battery later) |
| Mounting & hardware | £300–£500 | Roof rails, clamps, fixings |
| Scaffolding | £300–£600 | Standard 2-storey house |
| Electrical work | £400–£600 | Consumer unit, isolators, metering |
| Installation labour | £800–£1,200 | Typically 1-2 days |
| MCS certification & DNO | Included | Required for SEG payments |
If a quote doesn't include scaffolding or MCS certification, ask why. Some installers quote low and add these as extras.
Battery storage costs
Adding a battery significantly increases self-consumption — you use 70-80% of your solar electricity instead of 40-50%. Here's what batteries cost in 2026:
| Battery Size | Cost | Suits |
|---|---|---|
| 5kWh | £2,000–£3,000 | Small homes, low evening usage |
| 8kWh | £3,000–£4,500 | Average home, covers evening peak |
| 10kWh | £4,000–£5,500 | Larger home or EV overnight |
| 13-15kWh | £5,500–£8,000 | High usage, maximum independence |
Prices include installation. Popular brands: GivEnergy, Tesla Powerwall, Fox ESS, SolaX. Battery prices have fallen ~30% since 2022.
Our recommendation: For most homes, a 4kW solar system with an 8kWh battery is the sweet spot — roughly £8,000–£11,000 total. This covers daytime generation and stores enough for the evening peak.
Read our full analysis in Do you need a battery?
The 0% VAT saving
Since April 2022, residential solar panel installations carry 0% VAT instead of the standard 20%. This saves you:
- 3kW system: Save ~£800–£1,100 in VAT
- 4kW system: Save ~£1,000–£1,400
- 4kW + battery: Save ~£1,600–£2,600
The 0% rate applies automatically — your installer handles it. It covers panels, batteries, inverters, and labour. Confirmed by HMRC until at least March 2027.
What affects the price?
Quotes can vary by £2,000+ for the same system size. Here's why:
Panel quality
Budget panels (£100–£120 each) use older cell technology and may have lower efficiency (18–20%). Premium panels (£150–£200 each) from brands like SunPower, Longi, or JA Solar use newer N-type cells with 21–23% efficiency — generating more electricity from the same roof area. For most homes, mid-range panels offer the best value.
Roof complexity
Simple south-facing roofs with easy access are cheapest to install. Split arrays (panels on two roof sections), flat roof mounting, or difficult access (three-storey, listed building) add £500–£1,500.
Inverter type
A standard string inverter costs £500–£800. A hybrid inverter (battery-ready) costs £800–£1,200 but saves money if you plan to add a battery later. Microinverters (one per panel) cost £1,000–£1,500 but perform better with partial shading.
Location
Installation costs are generally higher in London and the South East (higher labour costs) and lower in northern England, Wales, and Scotland. The difference is typically 10–15%.
Installer margin
This is the biggest variable. Some installers charge significantly more than others for identical equipment. Always get at least three quotes from MCS-certified installers.
Cost vs savings: the real maths
The question isn't "how much does it cost?" — it's "how much do I get back?" Here's the maths for a typical 4kW system with battery:
| Item | Amount |
|---|---|
| System cost (4kW + 8kWh battery) | £9,500 |
| Year 1 savings (electricity + export) | £900 |
| Payback period | ~10 years |
| 25-year total savings (5% annual price rise) | £43,000+ |
| Net return (savings minus cost) | £33,500+ |
Based on south-facing roof, 24.50p/kWh import rate (Ofgem cap Q2 2026), 15p/kWh Octopus export rate, 75% self-consumption with battery, 5% annual electricity price increase. Your numbers will differ — try our calculator.
Even at today's prices, a £9,500 investment returns over £33,000 in savings over 25 years. And if electricity prices rise faster than 5% — as they have done recently — the returns are even better.
Get a personalised cost estimate for your home
Our calculator uses real satellite data and live Octopus Energy rates for your postcode. Free, instant, no email.
See Your Savings →Can you get solar panels for free?
Yes — if you're on a low income. Two government schemes fund solar panels for eligible households:
- Warm Homes: Local Grant — up to £15,000 of free upgrades including solar. Household income under £36,000, poor EPC rating.
- ECO4 — supplier-funded. Must be on qualifying benefits. Extended to December 2026.
Even without a grant, the 0% VAT saves you £1,000–£2,600. Read our full guide to solar panel grants.
Finance options
If you don't have £5,000–£10,000 upfront, there are several financing routes:
- 0% finance (2–5 years): Some installers offer interest-free deals. Monthly payments of £80–£200. No interest but higher monthly cost due to short term.
- Low-interest finance (10–15 years): Interest rates of 3–6%. Monthly payments of £60–£100. Often lower than your electricity savings — meaning solar is cash-positive from month one.
- Green mortgages: Some lenders offer additional borrowing at lower rates for energy improvements. Worth asking your mortgage provider.
- Government loans (coming soon): The Warm Homes Plan includes proposals for zero and low-interest government-backed loans, expected from 2027.
How to avoid overpaying
- Get three quotes minimum. The cheapest isn't always best, but you need comparison points. Use the MCS installer database to find accredited companies.
- Compare like for like. Check the same panel wattage, inverter type, and battery capacity across quotes.
- Ask what's included. Scaffolding, DNO notification, MCS certification, and aftercare should all be in the price.
- Check the warranty. Panels: 25 years. Inverter: 10–12 years. Battery: 10 years minimum. If shorter, ask why.
- Ignore the hard sell. "This price is only available today" means walk away.
- Use our calculator first. Know what your system should cost and save before speaking to installers. Try it free →
Frequently asked questions
How much do solar panels cost in the UK in 2026?
What size solar panel system do I need?
Is there VAT on solar panels?
How much does battery storage cost?
Can I finance solar panels on 0% interest?
Can I get solar panels for free?
Are solar panels cheaper now than 5 years ago?
How much does a 6kW solar system cost?
Important: WarmHomeUK is an independent service and is not affiliated with or endorsed by the UK Government, the Department for Energy Security and Net Zero, or Ofgem. Eligibility results are indicative and subject to official assessment. This content does not constitute financial or legal advice.
Written by Forhad Sarker
Forhad has worked inside the UK solar installation industry and now runs WarmHomeUK to make government grant information accessible. He tracks scheme changes across 300+ councils, reads the policy documents, and cross-references every guide against official gov.uk sources.