Generally known as domestic EPCs, they are required for a residential property. This is defined in the regulations as “consisting of a single dwelling” so they are probably more correctly referred to as EPCs for dwellings.
A “dwelling” is a building or part of a building occupied or intended to be occupied as a separate dwelling. In most cases this is fairly straight forward as a domestic EPC is clearly applicable to a house, flat, maisonette etc.
It can become a little less clear in certain instances such as a ‘granny annex’ or the flat above a shop for example. The decision on whether a single EPC is sufficient or a separate EPC is required for each part must be taken on a case-by-case basis. This depends largely on whether each part is separately accessible, or you have to go through one to get to the other, and whether each part has its own cooking, washing and sleeping facilities. If you are unsure, your chosen Proficiency Domestic Energy Assessor should be able to help you decide how the rules apply to your property.