EPC Requirements for Heat Pump Grant: What You Need to Know

By Home Heat Pump Guide Published 18 March 2026

UK homeowner reviewing EPC certificate to check heat pump grant eligibility requirements — No minimum EPC rating needed — but you must have a valid certificate, and any insulation recommendations must be addressed.

You need a valid EPC — but there is no minimum rating required. This is one of the most misunderstood parts of the BUS grant eligibility. The real catch is not your EPC rating — it is whether your EPC recommends insulation improvements that have not been done yet.

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EPC Requirements Explained

No minimumAny EPC rating qualifies (A-G)

10 yearsEPC validity period

£60-£120Cost of a new EPC assessment

The Insulation Catch

Heat pump system in a well-insulated UK utility room meeting EPC recommendations — If your EPC recommends insulation, get it done first — it is the most common reason for BUS grant delays.

This trips up more applicants than any other requirement. If your EPC recommends loft or cavity wall insulation, you must complete those measures before the BUS grant is approved. Valid exceptions: solid walls, loft already insulated, technical unsuitability, or measures completed since the EPC was issued.

Getting insulation done first is not just a grant requirement — it makes your heat pump work more efficiently and cost less to run.

Getting an EPC

Book an assessment with an accredited domestic energy assessor. Cost: £60-£120. Allow 1-2 weeks. You can check if you have a valid EPC on the EPC register website. Your installer may recommend an assessor.

Heat pump installer checking EPC recommendations during a home survey for BUS grant eligibility — Your installer will check your EPC during the survey and advise on any insulation work needed before the BUS application.

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Frequently Asked Questions

Do I need a minimum EPC rating?

No. Any rating from A to G qualifies.

What if my EPC recommends insulation?

You must complete recommended loft or cavity wall insulation first, or demonstrate they are not appropriate.

How much does an EPC cost?

£60-£120, valid for 10 years.

About EPC Requirements and Heat Pump Grants

Energy Performance Certificates are a key eligibility requirement for the Boiler Upgrade Scheme. While no minimum rating is needed, the insulation recommendation requirement ensures homes are adequately prepared for heat pump performance. Well-insulated homes deliver better running costs and more comfortable heating. The complete grants guide covers all eligibility criteria. Homeowners improving insulation alongside a heat pump and solar panels can achieve dramatic reductions in energy bills.