What improvements in energy efficiency can be expected following the revisions to Part L in 2005 (boiler amendment) and 2006?
A. The commitment in the Government’s February 2003 Energy White Paper was for a further substantive uplift in the energy efficiency of new buildings. The revisions made in 2006 are cost-effective, taking into account for the first time the social cost of carbon emissions, valued by the Treasury at around £75 per tonne of carbon emissions. The energy efficiency standards in the previous Building Regulations (Part L1 for dwellings and Part L2 for other buildings) came into effect on 1 April 2002. The changes were significant, so that, for instance, for new dwellings energy performance was expected to be 25% better than before. The cumulative effect of the 2002 and 2006 changes remains substantial at around a 40% improvement in the energy efficiency of buildings.
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