SAP Calculation
SAP Calculations, Part L Compliance & Future Homes Standard
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.
Future Homes Standard – Preparing for Tomorrow's Regulations
The Future Homes Standard represents the biggest change to new-build housing regulations in decades, with the focus shifting towards highly energy-efficient, low-carbon homes that are no longer reliant on fossil fuel heating.
For developers, architects and self-builders, this means designing with the future in mind from the very beginning. Roof layouts should allow sufficient space and orientation for photovoltaic (PV) solar panels to meet the expected renewable energy requirements, while traditional gas boilers are no longer considered a viable solution for new homes. Instead, low-carbon heating systems such as air source heat pumps are becoming the standard approach.
Early design decisions have a significant impact on compliance, construction costs and buildability. We work with clients during the design stage to ensure homes are optimised for both current Part L requirements and the transition to the Future Homes Standard.
Our advice includes:
- Providing minimum photovoltaic (PV) solar panel requirements to enable roof design.
- Assessing low-carbon heating systems, including air source heat pumps.
- Optimising fabric performance to reduce heat loss.
- Minimising thermal bridging through robust construction detailing.
- Achieving compliance without unnecessary over-specification.
- Future-proofing developments against upcoming Building Regulation changes.
Whether you're planning a single self-build or a multi-unit development, Crowther Solutions Ltd can help you deliver homes that are compliant today and prepared for tomorrow's standards.
Get Expert Advice Today
Speak directly to a senior assessor for nationwide support.
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