1. Main changes

    Main changes


    1. This Approved Document L2B came into force on 1 October 2010 in support of the Building Regulations 2010, SI 2010/2214. The main changes to the legal requirements and the supporting guidance since the issue of the previous Approved Document L2B are as follows:

    Changes in the legal requirements

    2. The exemption from the energy efficiency provisions for extensions consisting of a conservatory or porch is amended to grant the exemption only where any existing walls, windows or doors are retained, or replaced if removed, and where the heating system of the building is not extended into the conservatory or porch.

    3. The list of work in Schedule 4 (work that need not be notified to building control) is amended to include the installation of thermal insulation in a roof space or loft space where this is the only work carried out and the work is not carried out to comply with any requirement in the Building Regulations.

    Changes in the technical guidance

    4. The notional building used to determine In this Approved Document the guidance is generally based upon an elemental approach to demonstrating compliance, with additional guidance that provides greater flexibility. The main technical changes comprise a general strengthening of energy efficiency standards that are considered reasonable for work on thermal elements, controlled fittings and controlled services in existing buildings.

    5. Amended guidance is given for historic and traditional buildings which may have an exemption from the energy efficiency requirements or where special considerations apply.

    6. Amended guidance is given where an extension is a conservatory or porch that is not exempt from the energy efficiency requirements.

    7. The guidance for the renovation of a thermal element through the provision of a new layer or through the replacement of an existing layer has been expanded.

    8. Guidance is provided for swimming pool basins (walls and floor) in existing buildings.

    Main changes made by the 2010 and 2011 amendments

    This 2010 edition, incorporating the further 2010 amendments reflects the changes made as a result of the Building Regulations 2010; Building Approved inspector etc Regulations and the Building (Amendment) Regulations 2011. The changes mainly reflect regulation number changes as a result of re-ordering. There have been no amendments to the substantive requirements in Schedule 1(i.e. Parts A to P) of the Building Regulations.

    Please note the simplification of the definition of ‘room for residential purposes’ in regulation 2 of the Building Regulations 2010 and the amendment of the definition of “renovation” in regulation 2(1) of the Building (Amendment) Regulations 2011. Please also note that L1(c) has now become regulation 40.

    Main changes made by the 2013 amendments

    The main changes, which apply only to England*, are:

    • To take account of a recast of the European Energy Performance of Buildings Directive
    • Materials and workmanship guidance updated
    • Updated references to third party guidance

    Main changes made by the 2016 amendments

    Changes reflect alterations to the regulations, principally withdrawal of Regulations 29   to 33 of the Building Regulations 2010 and their replacement by Regulation 7A of the Energy Performance of Buildings (England and Wales) Regulations 2012 and changes in wording of Regulations 24, 25, 26, 26A, 27 and 27A of the Building Regulations 2010. There are no technical changes.