@
Mailman
The EPC assessor spend very little time in the property and uses their observations to feed complex software with pertinent information about the property like walls, floors, windows, roof, insulation levels and type, heating systems and so on.
the software contains lots of valid for different feature, for example values for the efficiency of different Boilers. So the accuracy of the assessed elements can make a big difference to the outcome, most notably in area that the assessor can’t see.
A landlord will usually want to get the inputs correct where getting them wrong could have a detrimental effect in letting the property. So proving to the assessor that the property does have cavity wall insulation will help achieve a higher end rating.
this can be important nowadays to potential tenants or purchasers, whereas a few years back the EPC regime was seen as a bit of bureaucracy only.
but the final rating is only as good as the work done to establish the correct input, and too often that isn’t done with enough diligence- garbage in leads to garbage out.