This guidance defines the requirements for buildings in relation to the conservation of fuel and power.
As of 6 April 2006 (2010) (2014) split into four sections:
L1A New dwellings;
L1B Existing dwellings;
L2A New buildings other than dwellings; and
L2B Existing buildings other than dwellings.
Part L controls the insulation values of building elements, the allowable area of windows, doors and other openings, the 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 out the requirements for SAP (Standard Assessment Procedure) calculations and carbon emission targets for dwellings. Regulation 16 requires the advertising of the SAP rating in all new dwellings.
Approved Document L1 is supported by a set of 'robust' construction details, now known as "Accredited Construction Details".[5] which focuses on the way of limiting air leakage and thermal bridging in construction. By using these tried and tested details, expensive on-site testing can be avoided. 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, solar emission, the certification, testing and commissioning of heating and ventilation systems, and requirements for energy meters.
Air permeability is measured by air tightness testing for new dwellings (based on a sampling regime), all new buildings other than dwellings and large extensions to buildings other than dwellings. These four Approved Documents must be read in conjunction with the supplemental official and industry documents (the 'second tier' guidance documents).
CO2 Emission Rates Calculation
Specification documentation.
Refer to Volume 2: Buildings other than dwellings for details of exemptions.
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