If an average home is assumed to be a semi-detached house with a gas-fired boiler and a floor area of 88.8 metres squared, then the carbon emissions associated with space and hot water heating, ventilation and fixed lighting (not appliances) is estimated to be:
(a) 0.553 tonnes of carbon per annum for a home build to Part L of the current Building Regulations (2006);
(b) 0.415 tonnes of carbon per annum for a Code level 3 home.
The energy/carbon standards set for Code level 3 homes represents a 25 per cent. improvement on current building regulations and will become the minimum regulatory standard for new homes when Part L of the Building Regulations are revised in 2010.