Solar Panel Cost UK 2026: What You'll Actually Pay
How much do solar panels cost in the UK?
A typical residential solar panel system costs between £3,500 and £11,000 in 2026, depending on size. The most popular choice for a 3-bed home — a 4kW system with 10 panels — costs £5,500 to £8,000 fully installed. All residential solar installations currently benefit from 0% VAT.
Solar panel prices in the UK have fallen by over 60% in the past decade, making them more affordable than ever. The cost of a system depends on several factors: system size (measured in kilowatts peak, or kWp), the type of panels, your roof layout, and your installer. Below, we break down exactly what you can expect to pay in 2026.
£5,500–£8,000
Typical 4kW system
MCS / industry average
0%
VAT rate
Until March 2027
8–12 years
Payback period
25+
Years of generation
Solar panel costs by system size
The table below shows the typical fully installed cost for each system size, including panels, inverter, mounting, wiring, and labour. All prices include 0% VAT and assume a standard pitched roof with no significant access issues.
| System Size | Panels | Cost | Annual Saving | Payback |
|---|---|---|---|---|
| 2kW | 5 | £3,500–£5,000 | £280–£380 | 10–14 years |
| 3kW | 8 | £4,500–£6,500 | £400–£550 | 9–12 years |
| 4kW | 10 | £5,500–£8,000 | £500–£700 | 8–12 years |
| 5kW | 13 | £6,500–£9,500 | £620–£850 | 8–11 years |
| 6kW | 15 | £7,500–£11,000 | £720–£980 | 8–11 years |
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What affects solar panel cost?
System size
The single biggest factor. A larger system generates more electricity and costs more upfront, but the cost per kW tends to decrease as you go bigger. A 3kW system costs roughly £1,500–£2,167 per kW, while a 6kW system costs around £1,250–£1,833 per kW.
Panel type
Monocrystalline panels are the most popular choice for UK homes. They offer the best balance of efficiency (20–22%) and price. Premium panels from manufacturers like SunPower or LG can push costs higher but deliver marginally more output per square metre. Standard-tier panels from reputable brands like JA Solar, Trina, or Longi are excellent value and widely used by MCS-certified installers.
Inverter choice
A string inverter is the most cost-effective option for simple roof layouts, typically adding £500–£1,000 to the system cost. Micro-inverters (one per panel) cost more — around £800–£1,500 total — but perform better if your roof has partial shading or multiple orientations.
Scaffolding and access
Standard scaffolding is usually included in the quoted price. However, if your property requires complex scaffolding (e.g. a three-storey home, limited access, or a dormer roof), this can add £300–£800 to the total cost.
Battery storage
Adding a home battery costs an extra £2,500–£5,000 on top of the panel installation. A battery allows you to store surplus electricity for evening use, increasing your self-consumption from around 50% to 80%. This is a worthwhile addition for households that use most of their electricity outside daylight hours.
Location
Installation costs can vary by region. London and the South East tend to be slightly more expensive due to higher labour and scaffolding costs. Conversely, some areas in the Midlands, North, and Scotland offer competitive pricing. Getting three quotes is the best way to gauge your local market.
Are solar panels cheaper now than before?
Significantly. The cost of solar panels in the UK has dropped by roughly 60–70% since 2010. A system that would have cost over £15,000 a decade ago now costs under £8,000 for the same output. At the same time, electricity prices have risen sharply — the standard Ofgem tariff reached 24.5p/kWh in early 2026 — making the financial return from solar much stronger.
The introduction of 0% VAT on residential solar installations in April 2022 (extended to at least March 2027) shaved a further 5% off costs at a stroke. Combined with the Smart Export Guarantee, which pays you for surplus electricity you send back to the grid, solar is now a genuinely compelling investment for most UK homeowners.
How to get the best price
Get at least three quotes. Prices vary considerably between installers. Comparing quotes is the single most effective way to avoid overpaying. Make sure every quote is from an MCS-certified installer — this is required for Smart Export Guarantee eligibility and is a mark of quality.
Right-size your system. A system that is too large for your usage will have a longer payback period. Use our free calculator to estimate the right size for your home, then discuss the recommendation with your installer.
Consider timing. Late autumn and winter are typically quieter periods for installers, which can sometimes mean more competitive pricing and faster installation dates.
Frequently asked questions
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