Part L1A - New Build Dwellings

Part L1A & PEA & DER & DFEE - New Build Dwellings

Part L1A, PEA, DER, DFEE - New Build Dwellings

What is building regulations part L1A?

Part L1A of the Building Regulations covers the minimum energy performance requirements for new domestic dwellings. By undertaking Standard Assessment Procedure (SAP) calculations, we provide Predicted Energy Assessments (PEAs) during design stage and Energy Performance Certificates (EPCs) at completion of the building. By undertaking these assessments, we ultimately compare them to building regulations. 


As part of the service, we provide detailed design stage documentation that aid you through the building process, also satisfying your legal obligation to supply the Building Control with confirmation that the Dwelling Emission Rate (DER) and Dwelling Fabric Energy Efficiency (DFEE) are both below the legal requirements. You will also get expert advice throughout the build process to ensure compliance is maintained and the highest rating is achieved on the final Energy Performance Certificate. 


But how can you increase the EPC score during design stage without increasing insulation? One of the provisional items to consider would be a secondary heating system – for example, a wood log burner in the living room. The Standard Assessment Procedure considers habitable temperatures of the dwelling to be 21°C in living area and 18°C elsewhere.


By using a renewable energy source in the living room and raising the temperature from 18°C to 21°C with fuel that has associated lower emission rates than, for example, mains gas or electricity, you benefit from lower emission rates and ultimately, better EPC score. However, please be careful with this approach – a decorative gas or electrical fire will not be as beneficial as the wood log burner.


When undertaking the SAP assessment with us, you are guaranteed to be provided with top quality service and assurance that your project will pass building regulations. We also provide Continuing Professional Developments (CPD) sessions where we guide you through the existing and future policies.


Contact us for a quote or visit CPD site for more information. 

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