Domestic New Build EPC (SAP)

SAP Calculations

SAP (Standard Assessment Procedure) calculations are a legal requirement for new-build dwellings and certain extensions, ensuring compliance with Building Regulations Part L. At Thompson Energy, we provide professional, compliance-focused SAP assessments across Hampshire and the surrounding areas.

We work closely with homeowners, builders, and developers to deliver accurate SAP calculations, supporting your project from design stage through to final sign-off, while keeping solutions practical and cost-effective.

What is a SAP Assessment?

A SAP (Standard Assessment Procedure) assessment is the government-approved method for demonstrating compliance with building regulations for new homes. It evaluates the energy performance of a dwelling by assessing insulation, airtightness, heating systems, ventilation, and renewable technologies.

As part of the SAP calculation, the following key compliance metrics are produced:

  • Target Emissions Rate (TER): The maximum allowable carbon emissions for the dwelling, based on a notional building that meets regulatory standards.

  • Dwelling Emissions Rate (DER): The calculated carbon emissions of the actual dwelling, which must be equal to or lower than the TER to achieve compliance.

  • Target Fabric Energy Efficiency (TFEE): The benchmark fabric performance of the notional dwelling, focusing on insulation and thermal performance.

  • Dwelling Fabric Energy Efficiency (DFEE): The calculated fabric efficiency of the proposed dwelling, which must meet or improve upon the TFEE target.

These calculations confirm that the property meets both carbon emissions and fabric efficiency requirements, forming a critical part of the building control submission and final sign-off process.

Our SAP Calculation & Assessment Service

At Thompson Energy, our SAP assessments include:

  • Dedicated energy assessor – You’ll work with a single point of contact who understands your project and supports you throughout the process.

  • Free U-value calculations for wall, floor, and roof elements.

  • Compliance-led advice – We focus on achieving compliance without unnecessary or costly design changes.

  • Fast turnaround available – Where required, we aim to meet tight build and submission deadlines.

How Our SAP Assessments Work

We recommend carrying out SAP calculations at design stage, however if your dwelling is already built, we can also complete as-built SAP assessments. Our process includes:

1. Initial Design Review

We review architectural drawings, specifications, and supporting information provided for the dwelling.

2. Design Stage SAP Calculations

SAP calculations are completed to assess compliance against Building Regulations Part L requirements.

3. Design Review & Advice

Where necessary, we provide clear, practical guidance on any changes required to achieve compliance, ensuring solutions are realistic and cost-effective on site.

4. Design SAP & Predicted EPC

We issue the design-stage SAP calculations and a predicted EPC for submission to Building Control or the Local Authority.

5. As-Built SAP Review

As construction nears completion, we review the final build details against the design SAP. If changes have been made, calculations are updated to confirm compliance.

6. As-Built SAP & EPC Lodgement

Once confirmed, we issue and lodge the as-built SAP calculations and EPC on the government register for Building Control sign-off.

Book Your SAP Assessment

Contact us today to arrange your SAP calculations and ensure your project meets all Building Regulations requirements.

📞💬 Call or WhatsApp: 07869 456378
📧 Email: ben@thompsonenergy.co.uk