‘Part L’ is the part of the BUILDING REGULATIONS that deals with the conservation of fuel and power. Schedule 1 of the THE BUILDING REGULATIONS 2010 lists the various ‘Parts’ and ‘Part L’ states that ‘reasonable provision shall be made for the conservation of fuel and power in buildings by – (a) limiting heat gains and losses – (i) through thermal elements and other parts of the building fabric; and (ii) from pipes, ducts and vessels used for space heating, space cooling and hot water services; and (b) providing fixed building services which – (i) are energy efficient; (ii) have effective controls; and (iii) are commissioned by testing and adjusting as necessary to ensure they use no more fuel and power than is reasonable in the circumstances’. Furthermore, Part 6 of the THE BUILDING REGULATIONS 2010, consisting of Regulations 21 to 35, deals with Energy Efficiency Requirements. For example, Regulation 26 states that ‘where a building is erected, it shall not exceed the target CO2 emission rate for the building’. The APPROVED DOCUMENT for ‘Part L’ is split into four sections; L1A (new dwellings), L1B (existing dwellings), L2A (new buildings other than dwellings), and L2B (existing buildings other than dwellings), each providing guidance for how  ‘Part L’ and ‘Part 6’ can be complied with for the category of building.

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