We’ve had an offer accepted at £425k on a 4-bed semi. When it was first listed a while back it had an EPC of C, then it came off the market and the sellers did some work (roof insulation, installing a wood burner, house already had solar panels) and it was relisted with an EPC of A (94).
However, our surveyor has basically said the A rating is overly optimistic. The walls in reality aren’t what the EPC assumes (part timber frame, not fully cavity), and the loft insulation is patchier than stated in the EPC certificate. The survey said the actual performance is likely lower and energy bills will probably be higher than expected.
There aren't any structural issues, however it's likely the house isn't as energy efficient as it was marketed as being.
Would it be reasonable to renegotiate the price? Or is it not really worth it?