The call has been timed to coincide with the second reading of the Housing and Regeneration Bill in the House of Commons.
As the Bill stands, buyers of new homes that have not been built to the Code will be issued with a statement indicating that no sustainability certificate exists for that property.
However, Paul King, chief executive of UKGBC, said that if the Bill remained unchanged, then home buyers ‘will be left in a state of confusion’.
King said: ‘If a new home has not been built to the Code then the accompanying documents should state explicitly that the home "fails" the Code for Sustainable Homes, or achieves "no stars". They should be left in no doubt that a home that has not been assessed against the Code has only been built to minimum building regulations and is therefore not a sustainable home.
‘This is essential as part of a concerted effort to educate and communicate with home-buyers on the Code. We need a clear presentation of the Code rating within the home-buying process, if the Code is going to drive behaviour change and influence choice among buyers.