How is an EPC Calculated?
An EPC can only be produced by either a Domestic
Energy Assessor (DEA) or by a Home Inspector (HI),
who must be approved by either a Government approved
Accreditation or Certification scheme.
The DEA will visit the property to assess the energy
related features. Once off site the data collected is calculated and then entered into a computer programme which is a calculation model, developed by the Government, known as;
RDSAP
(Reduced Data Standard Assessment Procedure).
This is a cost based rating system using pre-determined assumptions and therefore rates the house on its “built in” energy efficiency rather than the actual energy consumed.
A DEA will investigate:
Property type
Age of the property
Type of construction
Property dimensions
Room and water heating systems
Insulation levels
Windows and glazing types
Types of lighting
