Last edited 23 Jul 2014

2013 changes to the approved documents for part L of the building regulations

Contents

[edit] Introduction

Changes to the approved documents for Part L of the building regulations came into effect on 6 April 2014 when the 2013 editions of approved documents L1A and L2A came into force, and 2013 amendments to the 2010 editions of approved documents L1B and L2B came into force.

Under transitional arrangements, the previous approved documents continue to apply where work commenced before 6th April 2014, or where a building regulations application was made before 6 April 2014, as long as the work commences before 6th April 2015.

[edit] Approved Document L1A: Conservation of fuel and power in new dwellings, 2013 edition

The main changes approved document L1A are that:

  • A new requirement, regulation 26A, has been introduced that requires new dwellings to achieve or better a fabric energy efficiency target in addition to the carbon dioxide target.
  • The notional dwelling used to determine carbon dioxide and fabric energy efficiency targets is the same size and shape as the actual dwelling, constructed to a concurrent specification. The Part L 2013 specifications have been strengthened to deliver 6 per cent carbon dioxide savings across the new homes build mix relative to Part L 2010.
  • A summary of the Part L 2013 notional dwelling is published at Table 4 in the approved document with the full detail in SAP 2012 Appendix R. If the actual dwelling is constructed entirely to the notional dwelling specifications it will meet the carbon dioxide and fabric energy efficiency targets and the limiting values for individual fabric elements and buildings services. Developers are, however, free to vary the specification, provided the same overall level of carbon dioxide emissions and fabric energy efficiency performance 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 guidance for insulation of circulation pipes within communal spaces is given greater prominence.

[edit] Approved Document L2A: Conservation of fuel and power in new buildings other than dwellings, 2013 Edition.

The main changes in approved document L2A 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 specification. 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) buildings. 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.

[edit] Approved documents L1B and L2B

Both remain at their 2010 edition. However some amendments were made to those 2010 editions: Amendments to Approved Documents L1B and L2B 2010 editions.


This article contains public sector information licensed under the Open Government Licence v2.0.

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