SAP Calculation
SAP Calculations & Part L Compliance
Expert SAP Assessments Across the UK Since 2005
At Crowther Solutions Ltd, we provide the technical certainty needed to navigate Building Regulations Part L. With two decades of experience, our Chartered (MCIOB) assessors specialise in making SAP calculations work for your specific project goals, ensuring a smooth path from design to final completion.
Why Experience Matters in SAP
Compliance with Approved Document L requires more than just software entry. Since 2005, we have helped developers and architects optimise their specifications to meet carbon reduction and fabric energy efficiency targets. We don't just report "Pass" or "Fail"—we provide the upfront advice and practical knowledge required to reach compliance cost-effectively.
Our SAP Services Include:
New Build SAP Calculations: Demonstrating that your DER/DFEE meets the required TER/TFEE targets using the latest SAP 10.2 methodology.
Conversions & Extensions: Expert modelling for Part L1 compliance, including "Heavily Glazed Extension" trade-offs.
U-Value Calculations: Precise data for walls, floors, roofs, and openings.
Technical Consulting: Guidance on heating efficiencies, thermal bridging (Psi-values), and renewable technologies to avoid unnecessary specification costs.
Streamlined Compliance for New Dwellings
Getting your SAP calculation carried out at the design stage is critical. We work as your compliance partner to eliminate risks and ensure your building meets the 2021/2022 standards. By accurately modelling every element, we help you avoid expensive over-specification while ensuring your New Build EPC is ready for sign-off.
Extensions & Highly Glazed Developments
For projects exceeding the standard glazing limits, we use Notional vs. Proposed modelling. This allows us to offset heat loss in one area with improvements elsewhere, often saving clients thousands in construction costs while maintaining the architectural vision.
Get Expert Advice Today
Speak directly to a senior assessor for nationwide support.
Direct Mobile: 07814 462828