Updated September 2026 with Ofgem October to December 2026 rates

Plan your home energy improvements

Free calculators built on official UK data. See costs, savings, grants, and payback periods for heat pumps, insulation, solar panels, and more.

NewYour retrofit plan, in order. Four questions give every upgrade your home needs, cheapest payback first, with what each costs and what homes like yours measurably saved.Build my plan

Not sure where to start?

Three questions and we will send you to the right tool with your answers already filled in.

Heat Pump Cost Calculator

Installed cost, the Boiler Upgrade Scheme grant (£7,500, or £9,000 for oil or LPG homes off the gas grid), running costs against your current heating, and your payback.

Most popular

Heat Pump Running Costs

What a heat pump would cost to run in your home each year, on a standard or heat pump tariff, against your current heating.

Standard and heat pump tariffs

Insulation Savings Calculator

See how much you could save with loft, cavity wall, or solid wall insulation. Check if you qualify for free installation.

Free insulation available

EPC Improvement Planner

Find the cheapest way to improve your EPC rating. Improvements ranked by cost-effectiveness. Essential for landlords.

Landlord essential

Landlord EPC Calculator

Check a rented home against the rules, including band C by 2030, and the cheapest upgrades to get there within the spending cap.

For landlords

Solar Panel Cost Calculator

Calculate generation, bill savings, Smart Export Guarantee income, and 25-year returns based on your roof and location.

0% VAT until 2027

Boiler vs Heat Pump

Full 15-year cost comparison of a new gas boiler against a heat pump. Installation, running costs, maintenance, and grants.

Side-by-side comparison

Grant Eligibility Checker

Check your eligibility for the Boiler Upgrade Scheme, ECO4, Warm Homes grants and other UK energy grants in one place.

Up to £9,000 for a heat pump

Energy Bill Calculator

What a home like yours should pay for gas and electricity at the October 2026 price cap, and whether your own bill is high.

Typical 3 bed semi: £1,885 a year

Built on official UK data

Ofgem energy prices

Updated with each new price cap. Currently using Ofgem rates for October to December 2026.

Measured savings

Insulation savings measured in thousands of real homes by the government, with Energy Saving Trust installation costs.

DESNZ data

Government energy consumption data for 39,502 gas heated homes, published under the Open Government Licence.

GOV.UK grants

Grant schemes checked against published eligibility rules, last reviewed in September 2026.

Public data, with dates

Every figure comes from government, regulator or Energy Saving Trust data, with the date we last checked it. See our data.