SAP Calculations for Part L1A & L1B Compliance

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Stroma Built Environment delivers SAP Calculations for new and existing residential properties to ensure your building stock is compliant with the Government’s Standard Assessment Procedure (SAP) and Part L of the Building Regulations.

Nationwide Delivery

Access to a nationwide network of SAP Assessors and Air Tightness Engineers to arrange testing at short notice, and around your build schedule.

Building Regulations Compliance

Fast and efficient reporting for Building Regulations compliance and a smooth handover process.

Compliant SAP Calculation Software

MHCLG approved software to complete SAP compliant calculations, including FEE, SAP, and Environmental Impact Ratings.

SAP Calculations for New and Existing Residential Developments

Our SAP Calculations determine CO2 emission rates and annual energy costs (including space, water heating, and lighting) for domestic dwellings. If your specification is not on target to meet the required limits, or if design changes occur during construction, we’re able to provide advice and additional calculations to ensure Building Regulations compliance.

Design Stage SAP Calculations

Predicted Energy Performance Certificate

U-value Calculations

As-built SAP Calculations

SAP Design and Compliance Advice

We employ a certified team of SAP Assessors (On Construction Energy Assessors) who are experienced in completing calculations on challenging developments, including high-rise buildings and high sustainability projects.



“Our SAP and Air Tightness teams work in sync to ensure as-built SAP & EPC certificates are issued within 48 hours of a compliant air test result.”

Ben Talbutt, Senior Sustainability Consultant

SAP Calculations for Part L Compliance

We’re experienced in delivering SAP Calculations for new residential developments, as well as converted dwellings, extensions and conservatories for Part L1A and Part L1B compliance.

Part L1A SAP assessments before the start of site works for submission to Building Control. Upon completion, an as-built SAP calculation is completed.

Part L1B SAP calculations to assess the thermal efficiency of the proposed building fabric, along with the energy requirements of the heating, lighting, and hot water systems for converted dwellings.

Assessments for extensions and conservatories, including a notional SAP calculation based on the existing property with a conventional extension to the proposed dimensions, as well as a second extension SAP based on the proposed extension.

Compliance Pack Bundle

Stroma Built Environment offers complementary services for SAP Calculations for Part L1A & L1B Compliance to reduce procurement costs, gain project efficiencies and achieve full compliance and sustainability targets for your project.

Recommended services
Air Testing
Air Tightness Consultancy
Acoustic Consultancy
Acoustic Testing

Include SAP Calculations with your Sustainability Strategy

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