Tools & Calculators
Free, no-login estimators to help you decide what is worth doing. All figures are indicative — pair them with a proper assessment for big projects.
Insulation payback calculator
Typical cost
£1,500
Est. saving/yr
£330
Payback
4.5 years
Estimates based on typical UK savings as a share of heating spend. Your home, tariff and fuel will vary.
Heat pump vs gas — running cost
Gas / yr
£725
Heat pump / yr
£919
Difference
£194/yr more
At today's prices a heat pump often costs more to run than gas, but the £7,500 Boiler Upgrade Scheme grant cuts the upfront cost. Figures exclude hot water and standing charges.
Want a tailored answer?
These tools give quick estimates. For funded help and accredited installers, check the scheme tracker and course directory.