See what upgrading your home really costs.

Built on official data. Free, no sign-up needed.

£5,200

typical heat pump cost after the grant, for a 3 bed semi heated by gas

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Pick what you want to work out

Heat Pump Cost Calculator

Energy Bill Calculator

Insulation Savings Calculator

Solar Panel Cost Calculator

EPC Improvement Planner

Heat Pump Running Costs

Boiler vs Heat Pump

Landlord EPC Calculator

Grant Eligibility Checker

Home Buyer Energy Check

New Boiler Cost Calculator

Boiler: Repair or Replace?

EV Cost Calculator

Or start with a part of the house

Front of a red brick house with solar panels on the roof, white sash windows and a dark front door
Roof and loftLoft insulation, the cheapest big winWallsCavity or solid, filled or notWindowsGlazing cost and what it savesFoundations and floorInsulating under a timber floorSolar panelsGeneration, savings and 25-year returnsDoors and draughtsThe small gaps that add upHeatingHeat pump or boiler, 15 years of cost

From the guides

Heat pump cost for a 3-bed semiWhat it costs installed, what the grant takes off and what it costs to run.Is loft insulation worth it?The cheapest big win in most homes, and how thick is thick enough.Is cavity wall insulation worth it?What filling the gap costs and when it does not apply.Heat pump in a 1930s semiWill it work in a house of this age, and what has to change first.Double glazing costFrame types, window counts and how much it really adds up to.Boiler grants 2026What help exists for a boiler and a heat pump, and who qualifies.

Questions

Is Retrofit Planner free?

Yes. The calculators and guides are free to use, and nothing you enter is stored or sent anywhere.

Where do the numbers come from?

From official sources: DESNZ, Ofgem, the government's measured insulation savings, the EPC register and Energy Saving Trust cost data. Every page lists its sources and method, and you can see our data.

Are the costs quotes?

No. They are typical ranges. Get quotes from installers before you commit to any work.

Do I need to sign up?

No. Every calculator works without an account or an email address.

How much is the heat pump grant?

The Boiler Upgrade Scheme takes £7,500 off a heat pump, or £9,000 if it replaces oil or LPG heating. Use the grant checker to see what else you could get.

What should I do first?

In most homes loft insulation is the cheapest big win. Build your plan to put the jobs for your home in order.

Do the rules apply to landlords?

Yes. A rented home has to reach EPC band C by 1 October 2030. The landlord calculator shows the cheapest route there.

Are the energy prices up to date?

Bills use the October 2026 price cap. You can see every figure and its source.

Build your retrofit plan in four questions.

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