"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)."
This sounds suspect to me. Installing a wood burner decreases an EPC rating because you're opening up a hole that lets in cold air.
Fair enough, roof insulation would improve it, but if the solar panels were already there and have since aged, that should also bring the rating down a little bit.
Are you aware that the majority of EPCs are commissioned by estate agents who are either trying to sell or rent out houses?
They have a vested interest in them looking good.
FWIW, we've lived in 4 houses over 50 years, and the KwH listed on the reports haven't even come within 50% of our actual usage. They're desperately inaccurate.
Current home:
EPC thinks:
13821 kWh per year for heating
2991 kWh per year for hot water
Actual use:
Yearly Electricity usage
4896 kWh
Yearly Gas usage
25236 kWh
Electricity bounces up with cooking and F/F plugged in, TVs, etc, obviously.
The EPC inspector doesn't know that the timer on the UFH is broken. They don't know that the roof plastic tube heating system thingy isn't working. They don't know that rats are eating the wall insulation. They have commented that there's a combi boiler on the EPC report but have failed to note that it has two bloody hot water tanks attached to it, the timer is broken, and those hot water tanks want to heat to 60 degrees or so all the time, even when you don't actually want to use any water, so the heating of water is completely out of our control.
Nothing is tested, you see.
They're complete and utter pie in the sky.
But, mostly, remember who has the relationships with the EPCs assessors: the people wanting to get a sale or rental through.
You can order your own, independent EPC when you move in, if you like. But, imo, given they can't actually test anything, it's a completely pointless exercise.