EPC's are now mandatory upon construction, sale or rental of both domestic and non-domestic (commercial) buildings, whether new or existing. An assessment must be carried out by an accredited assessor and an EPC generated, which gives the building a rating of 'A' to 'G' (where 'A' is the most energy efficient).
The EPC is also accompanied by an Advisory Report (AR) which outlines ways in which energy can be saved and provides recommendations that include the short, medium and long term paybacks of various green technologies. The implementation of these recommendations would reduce the building's CO2 emissions as well as fuel costs.
Non-compliance with commercial EPC legislation will result in a penalty. The penalty is of up to 12.5% of the ratable value of the property, with a minimum of £500 and a maximum of £5,000.
This is in addition to the cost of a compliant commercial EPC