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Part L is split into two distinct primary documents:

  • Approved Document L2a Conservation of Fuel & Power in New Buildings Other Than Dwellings
  • Approved Document L2b Conservation of Fuel & Power in Existing Buildings Other Than Dwellings
  • These statutory documents give top level detail on Government requirements in England and Wales, a further second tier document, the Non-Domestic Building Services Compliance Guide, gives detailed guidance for services including specific efficiency requirements for space and water heating. For Scottish Building Regulations the Technical Handbook, Section 6, gives detailed guidance.

    In order to gain planning consent for new buildings it is essential that an emissions compliance calculation is carried out using SBEM (Simplified Building Energy Model) or DSM (Dynamic Simulation Modelling). To comply the BER (Building Emission Rating) must be equal to or less than the TER (Target Emission Rating), with BER taking into account all regulated carbon emissions including space and water heating.

    In the case of retrofit and replacement projects the targets for compliance are lower than those in new build, however, boiler efficiency has a part to play here as Display Energy Certificates (DEC’s) for public buildings and Energy Performance Certificates (EPC’s) for all buildings can be improved by using more efficient plant.                                             

    Find out more about Part L.