What will solar actually cost your home?
Free UK calculators for solar panels, batteries, heat pumps and boilers — built on published 2026 prices, with every figure dated and every estimate labelled as one.
Energy prices: Ofgem price cap 1 Oct–31 Dec 2026. Grant via an MCS-certified installer, England & Wales. Figures checked October 2026
The calculators
Twelve tools covering the whole decision: what it costs, what it saves, what help you can get, and how long it takes to pay for itself.
Solar panel cost calculator
What a solar system costs for your roof size, with or without a battery.
Open calculator →How many panels do I need?
Panels, roof space and system size worked out from your electricity use.
Open calculator →Solar battery cost & sizing
The battery size that fits your evenings — and what it should cost.
Open calculator →Solar payback calculator
When a system pays for itself, year by year, at today’s prices.
Open calculator →Solar savings estimator
Year-one and 25-year savings from any system size.
Open calculator →SEG earnings calculator
What your exported solar electricity earns under the Smart Export Guarantee.
Open calculator →New boiler cost
Replacement combi, system and regular boiler prices for UK homes.
Open calculator →Heat pump cost
Air source, ground source and air-to-air prices after available grants.
Open calculator →Heat pump vs boiler
Running costs compared honestly at October 2026 energy prices.
Open calculator →Insulation savings
Loft and cavity wall insulation costs, savings and payback by house type.
Open calculator →Grant eligibility checker
ECO4, the Boiler Upgrade Scheme and Warm Homes — who qualifies, and by when.
Open calculator →EPC rating estimator
A rough A–G band for your home, plus the three upgrades that help most.
Open calculator →Why trust these numbers?
Sourced, then dated
Energy prices come from the Ofgem price cap; grant amounts and deadlines from the published scheme rules; install costs from MCS-based market data. Every figure carries a “checked October 2026” label.
Estimates say so
Where a number is a market estimate rather than a published figure — install prices, savings, payback — it is labelled “estimate” and shown as a range, never a single convenient figure.
Nothing to sell you
We don’t install anything and don’t take commission from installers. The maths is shown in the open so you can check it, change the assumptions, and take the results to any quote.
Common questions
How much do solar panels cost in the UK in 2026?
A typical 4kW system costs an estimated £6,000–£8,000 installed (MCS data suggests roughly £1,565–£1,686 per kW). With a 5kWh battery, expect £10,000–£14,000. Installs are 0% VAT until 31 March 2027. Try the solar cost calculator for your roof.
Are solar panels worth it at 2026 prices?
At 26.32p/kWh, a well-sited 4kW system typically pays back in an estimated 10–15 years (nearer 10 with a battery), then generates for 25+ years. The honest maths — including when it is not worth it — is in our worth-it guide and the payback calculator.
Which grants end soon?
ECO4 ends 31 December 2026 and the 0% VAT window closes 31 March 2027. The Boiler Upgrade Scheme (£7,500 heat pump grant) runs to 2030. Check what you qualify for in the grant checker.
Ready for real prices?
Calculators give you the ballpark. Get free, no-obligation quotes from MCS-certified UK installers and compare them against these numbers.