What is an EPC?

The EPC is broadly similar to the labels now provided with domestic appliances such as refrigerators and washing  machines. Its purpose is to record how energy efficient a property is as a building. The certificate will provide a rating of the energy efficiency and carbon emissions of a building from A to G, where A is very efficient and G is inefficient.

The data required to allow the calculation of an EPC includes the following:

1. Built form.
2. Number of storeys.
3. Date built.
4. Property dimensions including average floor to ceiling heights.
5. Presence and size of heated conservatories.
6. Wall construction and any areas that are of an alternative construction.
7. Roof construction and whether there is a room in the roof.
8. Openings (windows and doors) and their age.
9. Percentage double glazed.
10. Number of open fireplaces.
11. Heating system – type and fuel used.
12. Boiler (manufacturer, model and ID number)
13. Heating controls – room stats, programmer, etc.
14. Presence of secondary heating sources – i.e., focal point heaters, such as a coal effect gas fire.
15. Water heating system and if applicable capacity and insulation for hot water cylinder.
16. Electricity meter and types.

EPCs are produced using standard methods with standard assumptions about energy usage so that the energy efficiency of one building can easily be compared with another building of the same type.

This allows prospective buyers, tenants, owners, occupiers and purchasers to see information on the energy efficiency and carbon emissions from the building so they can consider energy efficiency
and fuel costs as part of their investment.

For homes, two ratings are shown. The energy efficiency rating is a measure of a home’s overall efficiency. The environmental impact rating is a measure of the home’s impact on the environment in
terms of carbon dioxide (CO2) emissions

An EPC is always accompanied by a report that lists cost effective recommendations and other measures (such as low and zero carbon generating systems) to improve the energy rating of the building. The certificate is also accompanied by information about the rating that could be achieved if all or some of the recommendations are implemented.