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This has never been true. To qualify for the £7.5K grant you just needed an EPC of D or above, and loft insulation. The gov then removed the loft insulation requirement a while ago. There’s never been any mention of airtightness or anything else like that.
ectoplasmosis-
The gov then removed the loft insulation requirement a while ago
Interesting, thanks. It seems to be different in Scotland where @konastab01 and I are.
From https://www.homeenergyscotland.org/home-energy-scotland-grant-loan-terms-conditions
Loft and cavity wall insulation
If your property’s current energy report recommends loft and/or cavity wall insulation, you will need to install this before you can claim funding for other improvements.We will only release funding when you send us a post-installation EPC which does not include a recommendation for either loft or cavity wall insulation. If loft and/or cavity wall insulation are not suitable for your property, then your application must include information from a qualified professional explaining this.
Cupcakes
I might have misunderstood but I think the implication is that the government grant for installing an ASHP isn't available unless your home meets air tightness and insulation levels.