Tel: 01485 544637
Email: info@gemstoneenergy.co.uk
Recent Posts
Useful Links

Please go to our sister company for full Building Surveying Services and Building Regulations Consultation

Gemstone Building Surveyors


We are fully accredited by STROMA

Stroma Certified Energy Assessor        Stroma Accredited Code Assessor

Find Energy Efficient Products

The Code Store

Gemstone Engery

New Part L for Dwellings

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:

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

New Part L for buildings other than Dwellings

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