Part L Wales 2014 - A summary of the significant changes (Version 2)

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The UK Government has a legally binding commitment under the Climate Change Act (2008) to achieve significant reductions in greenhouse gas emissions of 34% by 2020 and 80% by 2050 (compared to 1990) levels.

Carbon dioxide from buildings, domestic and non-domestic, makes up around 45% of the total UK emissions, primarily from sources which are covered by Building Regulations e.g. space heating and cooling, water heating and lighting. 

This Construction Briefing summarises a selection of the more important changes made to Part L Wales (which comes into effect in July 2014).

The sheet includes, amongst other things, details of the transitional provisions undertaken to make the regulatory changes as smooth as possible, the changes to the methodology for calculating carbon settings and an explanation of the ways each of the changes will affect TRADA members.


  • Transitional provisions
  • Summary of significant changes
    • Domestic - new build. Approved Document L1A
           - Carbon reduction targets
           - Changes to the carbon setting methodology
           - Limits on design flexibility - 'Backstop' fabric parameters
    • Domestic - existing buildings. Approved Document L1B
           - Extensions
           - Consequential improvements
    • Non-domestic, new build. Approved Document L2A
           - Carbon and energy requirements
    • Non-domestic, existing. Approved Document L2B


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