The Future Homes Standard (FHS), set to take effect in 2026, will transform how new homes in England are designed and built—requiring a 75–80% reduction in carbon emissions compared to 2013 standards. Key changes include the ban on gas boilers, mandatory low-carbon heating systems, solar PV panels, and the introduction of SAP 10.3 and the Home Energy Model (HEM) for compliance. At Green SAP Compliance Services, we help architects and developers navigate these updates with early-stage energy modelling, heat pump sizing, and regulatory documentation—ensuring your projects meet Part L 2025 requirements without costly delays. Start planning now to future-proof your designs and stay compliant.

The 25% glazing rule limits window area in extensions to reduce heat loss, but exceeding this threshold doesn’t mean sacrificing design. Compliance can be achieved through area-weighted U-value calculations or a full SAP assessment, the latter offering greater flexibility for large glazed areas. However, extensive glazing introduces risks such as heat loss, thermal bridging, and overheating, which require early-stage strategies like low-g glazing, external shading, and robust insulation detailing. At Green SAP Compliance Services, we provide SAP modelling, U-value assessments, and TM59 overheating analysis to help architects deliver light-filled, energy-efficient spaces that meet regulations without compromising aesthetics.

Part O of the Building Regulations aims to reduce overheating risks in new homes, and compliance can be demonstrated via two routes: the Simplified Method or Dynamic Thermal Modelling (DTM). The Simplified Method is quick and cost-effective but highly restrictive, often forcing design compromises like reducing glazing. In contrast, DTM uses advanced simulation tools to model real-world conditions, offering flexibility for complex or urban projects with large glazed areas. While DTM requires more time and cost, it enables creative solutions—such as low-g glazing, MVHR systems, and shading—without sacrificing aesthetics. At Green SAP Compliance Services, we provide both assessment routes and expert advice to ensure your designs meet Part O requirements efficiently and effectively.