See what solar could save your home, in under a minute. Plain numbers, with the source next to each one.
Free. No sign-up to see your estimate.
Each calculator takes about a minute.
What panels could save on your bill.
Check solar →How big a battery you actually need.
Coming soonRunning costs compared with your boiler.
Coming soonCost per charge at home vs public.
Coming soonWhat you could get, and if you qualify.
See all grants →0% VAT on installed solar, batteries and heat pumps until 31 March 2027, then 5%.
Source: HMRC VAT Notice 708/6. Updated 25 Oct 2026
Our calculators are free. If you ask for quotes, the installers you choose pay us a fee. They pay the same whatever your result, so it doesn't change your numbers.
The Boiler Upgrade Scheme (England and Wales) gives £7,500 towards a heat pump, fitted by an MCS installer (certified to the UK standard).
Off the gas grid and heating with oil or LPG? You could get £1,500 more for an air or ground source heat pump, until March 2027. Air-to-air heat pumps get £2,500.
Source: GOV.UK, Boiler Upgrade Scheme: what you can get. Updated 25 Oct 2026
No. We don't sell energy or install anything. We build calculators and explain the numbers.
Prices come from the Ofgem price cap. Grants come from GOV.UK and Ofgem. See Methodology and sources.
No. You see your estimate first. We only ask for details if you want quotes.
It's an estimate, not a quote. Your roof, usage and tariff will change the real figure.
