Solar Panel Calculator
Find out what solar panels would cost for your home, how much you could save each year, and how long it would take to earn back the investment. No email needed - your full results are shown instantly.
Get price updates and money-saving tips
Join our free newsletter — solar pricing updates, cost-saving tips, and the best deals. No spam, unsubscribe any time. Privacy policy.
How this calculator works
Our solar panel calculator estimates your installation cost, annual energy savings, and payback period based on your roof size, orientation, electricity usage, and UK region. You tell us how many bedrooms your home has, which direction your roof faces, and your approximate annual electricity bill. The tool then recommends a system size and calculates a realistic installed price.
Savings estimates account for the proportion of solar energy you are likely to use directly (self-consumption), the amount you would export back to the grid under the Smart Export Guarantee (SEG), and current UK electricity prices. We also factor in whether you are adding battery storage, which increases the upfront cost but typically improves self-consumption from around 40% to 70% or more.
Solar output varies by region, roof pitch, and shading, so these figures are based on average UK irradiance data for your area. Actual performance will depend on your specific installation. We recommend getting quotes from at least three MCS-certified installers, as this certification is required to qualify for the SEG payments.
Common questions
How much do solar panels cost in the UK in 2026?
A typical 4 kW solar panel system costs between £5,500 and £8,000 fully installed in 2026. Prices vary by region, panel quality, and installer. A smaller 3 kW system starts from around £4,500, while a larger 6 kW system with battery storage can reach £18,000 or more.
How long does it take for solar panels to pay for themselves?
Most solar panel systems pay for themselves within 8 to 14 years, depending on your electricity usage, roof orientation, and whether you add battery storage. After payback, the remaining 10-15 years of the system's lifespan is pure profit.
Do I need planning permission for solar panels?
Most domestic solar panel installations are permitted development and don't need planning permission. Exceptions include listed buildings, conservation areas, and installations that protrude more than 200mm from the roof surface. Always check with your local council if unsure.
What is the Smart Export Guarantee (SEG)?
The Smart Export Guarantee (SEG) pays you for surplus electricity you export back to the grid. Rates vary by supplier - typically around 4-5p per kWh, though some suppliers offer up to 15p. You need an MCS-certified installation and a smart meter to qualify.