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Carbon benefits from the new Part L
Dwelling typeCO2 saving per year per home (tonnes)Carbon saving per year per home (tonnes)Number of homes built per yearAnnual national carbon saving in 2010 (tonnes)
Flats and maisonettes1.20.4037,60075,200
Mid-terrace1.00.3325,30042,167
Semi-detached houses and bungalows1.30.4323,10050,050
Detached houses and bungalows1.50.5058,500146,250
Total per year in 2010ÌýÌýÌý313,667
Source: Proposals for Amending Part L, July 2004
The cost of implementing the changes
Dwelling typeExtra cost per unit (£)
Flats and maisonettes323
Mid-terrace372
Semi-detached houses and bungalows574
Detached houses and bungalows1170
Source: Proposals for Amending Part L, July 2004
Worst acceptable U-values (W/m2K)
ElementArea-weighted average value for all elements of the typeIndividual element value
Wall0.350.45
Floor0.250.45
Roof0.250.35
Windows, doors, roof windows and rooflights2.23.3
Source: Proposals for Amending Part L, July 2004