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The official magazine of LABC
Building Regulations Part L
Part L1 is specific to dwellings. It controls the insulation values of building elements, the allowable area of windows, doors and other openings, air permeability of the structure, the heating efficiency of boilers and the insulation and controls for heating appliances and systems together with hot water storage and lighting efficiency. It also sets requirements for SAP and Carbon Index ratings for dwellings. Further regulations also require the advertising of these ratings.

ADL1 is supported by a set of robust standard construction details.

Part L2 relates to all building uses other than dwellings. In addition to insulation requirements and limitation of openings of the building fabric this part considers solar heating and heat gains to structures, it controls heating, mechanical ventilation and air conditioning systems, lighting efficiency, space heating controls, air permeability plus air tightness testing of larger buildings, solar emission, the certification, testing and commissioning of heating and ventilation systems, and requirements for energy meters.

Download Approved Document L1A: Conservation of fuel and power (New dwellings) (2006 edition) (PDF 317 Kb)

Download Approved Document L1B: Conservation of fuel and power (Existing dwellings) (2006 edition) (PDF 299 Kb)

Download Approved Document L2A: Conservation of fuel and power (New buildings other than dwellings) (2006 edition) (PDF 322 Kb)

Download Editable version of ADL2A checklist (DOC 130 Kb)

Download Approved Document L2B: Conservation of fuel and power (Existing buildings other than dwellings) (2006 edition) (PDF 315 Kb)


Additional information on Part L including archived versions and ways to order hardcopy is available from this section of the planning portal .