The new Part L1A, will require a 25% improvement on the 2006 standards for every new home. An aggregate approach for improvements of new non-domestic buildings will deliver an improvement of 25% overall, rather than for each individual building. This is due to the fact that there is a greater variety amongst non-domestic buildings and some will be much easier than others to make efficient. The changes to Part L will increase the minimum levels of energy efficiency for building fabric and services, so that CO2 targets cannot be achieved through renewables alone. This reflects the principles of reducing overall demand for energy. The measures will also be relevant when people elect to carry out work to existing buildings including extensions and conversions, fabric renovations, replacement windows and boilers. This Approved Document L1A (2010) comes into force October 2010 and supports the Building Regulations 2000. The Approved Documents provide technical guidance on ways of complying with the Building Regulations. They are continuously revised in line with new legislations.
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