Main changes in the 2013 edition

This approved document, Approved Document L2A: Conservation of fuel and power in new buildings other than dwellings, supports the energy efficiency requirements of the Building Regulations. Regulation 2(1) of the Building Regulations defines the energy efficiency requirements as the requirements of regulations 23, 25A, 25B, 26, 26A, 28, 29 and 40 and Part L of Schedule 1. This approved document takes effect on 6 April 2014 and is for use in England*. The 2010 edition will continue to apply to work begun before 6 April 2014, or to work subject to a building notice, full plans application or initial notice submitted before 6 April 2014.

The main changes in this approved document are that:

  • The notional building used to determine carbon dioxide targets is the same size and shape as the actual building, constructed to a concurrent The Part L 2013 specifications have been strengthened to deliver 9 per cent carbon dioxide savings across the new non-domestic building mix relative to Part L 2010.

  • A wider set of notional buildings has now been defined for top-lit, side-lit (heated only) and side-lit (heated and cooled) The notional building air permeability has been further subdivided by size.

  • A summary of the Part L 2013 notional buildings is published at Table 5 in the approved document with the full detail in the National Calculation Methodology (NCM) modelling guide. If the actual building is constructed entirely to the notional building specifications it will meet the carbon dioxide targets and the limiting fabric and buildings services parameters. Developers are, however, free to vary the specification, provided the same overall level of carbon dioxide emissions is achieved or bettered.

  • The document consolidates the amendments made in December 2012 requiring the feasibility of high-efficiency alternative systems to be taken into account before construction commences.

  • The document is in a new style format and an index has been introduced

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.

* This approved document gives guidance for compliance with the Building Regulations for building work carried out in It also applies to building work carried out on excepted energy buildings in Wales as defined in the Welsh Ministers (Transfer of Functions) (No.2) Order 2009. This approved document also gives guidance applying to buildings of statutory undertakers and of the Crown or carried out by Crown authorities in both England and Wales in respect of regulations 25, 25A, 25B and 26.

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