An epc can only be created by a qualified and accredited Energy Assessor who is certified through an approved government accreditation body. The Assessor will have access to approved software that is used to perform the calculations and register the report on the national epc register.
There are many data entries that go into creating your EPC, however the 3 most important items that contribute the most to the rating are:
- The main source of fuel ie, gas, electric, oil, LPG etc.
- The heating system in the property.
- The amount of insulation in the property.
Main source of fuel
Gas and air source heat pumps rate best on the EPC as they cost less to heat the home.
Peak rate electric and LPG rate very poorly on the EPC because they cost significantly more to heat your home using these fuel sources.
A good heating system that also has heating controls such as a room thermostat and a programmer/timer will rate well especially if the property is heated by one of the lower running cost fuels previously mentioned.
The Amount of Insulation
Good insulation in the walls, floors and roof keeps the energy running costs of the property low and improves the EPC rating. This in conjunction with a good heating system will normally ensure a good energy rating.
To improve your energy rating try to implement those factors mentioned above as it will go a long way to achieving a good rating. If the property is to be rented, then minimum energy efficiency standards need to be reached on the EPC.