The Government is complying with the Energy Performance of Building Directive (EPBD) with the introduction of the Energy Performance Certificate. The EPC shows a record of the energy efficiency levels and CO2 emissions of a building, by using a standard table from A to G (A being very efficient, G being very inefficient).
Firstly, the energy survey is performed by a qualified energy assessor who visits the property and examines key items within the premises such as loft insulation, domestic boiler, hot water tank, radiators, windows for double glazing, etc. Once this information is obtained it is then placed into a software programme which carries out and calculates the level of energy efficiency and CO2 emissions.
This programme then proceeds to generate the level of energy efficiency in the property, with a recommendation report on the ways to improve the energy ratings by using cost effective and low and zero carbon generated systems. This will help improve your energy levels and ensure future savings on fuel costs.
There is a similar report which provides figures on the environmental impact. This report shows a table of estimated energy bills per annum and the potential for improved and lower fuel costs, but without any reference to the actual householder bills.