Energy
Performance Certificates
The
Government has introduced Energy Performance Certificates (ECPs)
to help improve the energy efficiency of all buildings. From 1st
October 2008 all buildings - homes, commercial* and public* - must
have an EPC whenever the building is sold, built or rented.
*in England & Wales
More information:
Communities and Local Government information on
Energy Performance Certificates - 
Read an article on EPCs - 
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