According to this article it is, although in practice I have had very little feedback putting energy efficiency as one of the forefront reasons for buying a house.
In fact, I have never had one client raise an issue connected with the EPC rating for their property, although this may be because they have already considered this before making their offer.
The feedback from my clients confirm that it is still all about location, location, location!
Having a high EPC rating can significantly add value to your property as over a third (36%) of UK adults revealed they would be prepared to spend an extra £15,000 on a property with a high rating (between A to C). Plus 1 in 5 (19%) said they wouldn’t go lower than a C rating.