It is one of the most-asked questions in domestic retrofit, and until recently it had a bureaucratic answer: yes, because the grant said so.
It does not say so any more, and the change has quietly opened up work for both trades — as long as somebody explains it properly.
What the rule used to be
The Boiler Upgrade Scheme used to require a valid EPC, with any outstanding loft or cavity wall insulation recommendations dealt with before an application could go ahead. In practice that meant a homeowner who wanted a heat pump was often sent away to arrange insulation work first.
That requirement was removed on 28 April 2026 under SI 2026/390. There is no longer an EPC condition on the scheme at all, which means insulation is no longer a gate between a household and the £7,500 — indicative, and confirmed at application.
So is the answer now “no”?
Not quite, and this is where being straight with people pays. The grant no longer requires it. The system is a different matter, and it is a question for the survey rather than the website: a heat pump has to be sized to the heat loss of the building as it actually is, and how well the fabric performs is part of that.
So the honest answer to a homeowner is two sentences rather than one. Insulation is no longer something standing between you and the grant. It is still something the survey will look at, because it changes the size of the system and what it costs to run.
The old answer was “the paperwork says no”. The new one is “let us look at the house”. That is a much better conversation for both trades.
Why insulation firms should care about a heat pump rule
Look at who is asking the question. Somebody typing “do I need insulation before a heat pump” is a homeowner who is actively spending money on their home, has already been thinking about heat loss, and is in exactly the frame of mind where loft or cavity work makes obvious sense.
They are not searching for an insulation firm. They will not appear in any search you are bidding on. But they are a better prospect than most of the people who are, and almost nobody in the insulation trade writes anything that reaches them.
The trap: two schemes, two different EPC rules
Here is the bit that catches people out, and it is worth getting right on the page.
- Boiler Upgrade Scheme. No EPC needed since 28 April 2026. England and Wales.
- Warm Homes: Local Grant. EPC band D to G, household income usually at or below £36,000, England only, and delivered by participating councils — so it depends on the address as well as the household.
Which produces a genuinely odd situation you should be ready to explain: a household may need no certificate at all to get help with a heat pump, and may need one showing a poor band to get help with insulation. Two schemes, opposite requirements, and a homeowner with no reason to expect that.
Note also the two questions people constantly merge on the insulation side — whether the property qualifies, and whether the council is running the scheme. They are different facts with different answers, and the insulation funding picture in 2026 goes through that in more detail.
Answering it on your own site
None of this fits in a paragraph on a services page, because the answer depends on the property and the household. That is what a checker is for. GrantCheck tests the address against the published criteria rather than asking the homeowner to self-assess, keeps eligibility and council participation apart, and says so plainly when it cannot confirm something.
An honest “not yet” still earns the job more often than people expect. A homeowner told exactly which rule they missed does not resent you for it — they remember that your site gave a straight answer when four others gave them a form, and a good number of them come back when the situation changes.
If you fit heat pumps as well, the same logic runs the other way: the households being told “insulation first” by out-of-date websites are eligible today, and the grant question can be answered on your own page in about thirty seconds.
See what this looks like for insulation installers, or book fifteen minutes and we will run it against real addresses in your patch.
Grant figures on this page were checked against gov.uk on 30 August 2026 and are indicative — the binding figure is the one from the official application. Spotted something out of date? Tell us and we will fix it.