To ask the Secretary of State for Communities and Local Government what assessment her Department has made of the range of the additional build costs of a zero carbon home in addition to Part L of the 2006 building regulations. (176617)

I refer the hon. Member to the answer given to him on 11 December 2007, Official Report, column 545W and to the answer given to the hon. Member for Beckenham (Mrs. Lait) on 8 October 2007, Official Report, column 35W.