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SAP Calculation and EPC

You will need a SAP calculation for residential buildings at Design Stage and when the construction is complete. Making changes mid-build can impact the final calculation so getting the specification on your development right first time is important.

SAP Calculations - At what stage(s) does this apply during your build?

What is a SAP?

A SAP (Standard Assessment Procedure) is required for new build residential buildings. It is essentially a calculation for modelling your design and checking compliance with CO2 targets.

The SAP model is created using design drawings and is checked against building regulations (Approved Document Part L in England and Wales, and Technical Handbook Section 6 in Scotland). To show compliance on new builds, the Dwelling Emission Rate must be equal to or better (lower) than the target.

A SAP is used to produce an EPC (Energy Performance Certificate), which is required before you can sell or rent the completed building. Make sure the EPC doesn't hold up your handover. We offer a Same Day EPC Guarantee with a 100% success rate!

A SAP may also be required for existing residential buildings that are being extended or renovated.

Top Tips for SAP Assessments

  • A design stage SAP must be submitted to your Building Control Officer (BCO) before starting on site and a revised ‘As Built’ SAP is required at the end of the build. The ‘As Built’ SAP is used to produce an EPC (Energy Performance Certificate).

  • Our accredited SAP assessors can help you find efficient routes to compliance. Contact our team for further information.

  • If you regularly build to the same specification, we recommend you have psi-values calculated for each of the main thermal bridging junctions.

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The Energist Approach

  • Our accredited SAP assessors share their knowledge with you, interpreting your design drawings and specification to provide cost-effective recommendations and solutions to pass or to scale back.

  • Our team understand your deadlines and provide a same day response. We’re right by your side and offer a 48 hour fast track service and Same Day EPC Guarantee so you won’t be kept waiting.

  • We work as an extension to your design team to review your plans before liaising directly with your BCO (if you want us to).

  • We complete both Design Stage and As Built parts of your SAP Assessment and email your report within your deadlines.

You may also need:

SAP For Extensions | Thermal Bridging | Air Leakage Test

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