Since its introduction in 2003, The Energy Performance of Buildings Directive (EPBD) has had sweeping implications for the developers, owners and occupiers of domestic and commercial buildings in the UK.  For example, Energy Performance Certificates (EPC) are a legal requirement providing information to a new tenant or owner when buildings are constructed, sold or rented.  Part L of the Building Regulations was substantially influenced by the EPBD, regarding CO₂ emissions for new buildings.  There are now significant legal requirements for property owners responsible for the maintenance of air conditioning plant. With the introduction of the Green Deal, significant energy improvements can be made to your property with no up front costs to you.