Heat Pump Cost Checklist: Estimating Your Total Price

1. Define the complete installation scope

Ask the installer to connect every proposed item with a finding from your home survey. The heat-loss calculation should explain the heating requirement rather than simply copy your existing boiler size. Ask which rooms need radiator or pipework changes, and why those changes are included. Request separate descriptions for necessary work and optional improvements so you can compare the same specification across firms.

Check how the proposal handles domestic hot water, controls and electrical connections before accepting its total. A cylinder needs a suitable location and a clear description of associated work. The outdoor unit also needs an agreed position and base where applicable. Ask who removes the old system and makes good disturbed surfaces. Do not assume these jobs are covered just because equipment appears on the quotation.

• Heat-loss survey and design assumptions.
• Heat pump unit, cylinder and associated fittings where needed.
• Radiator or pipework changes, controls and electrical work.
• Siting, base, old-system removal and making good.
• Commissioning, MCS certificate and handover.
• Grant deduction and the remaining amount payable.

2. Separate the project total from funding

The grant entry should identify the scheme and show how it affects your bill. Boiler Upgrade Scheme support applies in England and Wales through an MCS-certified installer. Published heat pump categories include air-to-water, ground source and air-to-air systems. Ask the installer which category applies to your proposal and confirm current conditions through the official notice. A proposed deduction is not a substitute for scheme approval.

Record the full installation total alongside the grant deduction and your remaining contribution. Ask whether preparatory work appears on another contractor’s quote rather than the main installation bill. Keep every linked proposal together so the project total remains visible. If borrowing is offered, compare repayment terms separately from the equipment specification. A loan maximum is not an estimate of what your installation should cost.

3. Investigate a quote that looks high

Ask the installer for an itemised explanation before deciding that a higher quote is unreasonable. Compare two or three MCS quotes prepared from the same brief and household information. Check whether firms propose different radiator changes, cylinder arrangements or access work. Ask each firm to explain its sizing calculation and any substantial difference in scope. Do not request a smaller unit solely to lower the quoted total.

Confirm that the expected grant has been applied to the correct part of the proposal. Ask for written reasons when the installer considers your project outside a funding category. Request a revised quotation when the scope changes, keeping the original for comparison. Avoid signing while major exclusions remain unresolved. Your decision should rest on an explained design and complete total rather than an unexplained discount.