New Part L Guide available at Knauf Insulation’s Housebuilders Hub

  • 7 Nov 2023

To help housebuilders, architects, and contractors keep up-to-speed with changes, Knauf Insulation has launched an updated edition of its Part L Guide.

The housebuilding industry has experienced a lot of change in the last two years, particularly in the area of energy efficiency. The updated Part L (Conservation of fuel and power) Building Regulations for England came into full force this June and there’s a lot to adapt to. For example, new homes must now produce 31% less operational carbon emissions and meet tighter fabric efficiency standards. Housebuilders are also required to complete a new Building Regulations England Part L (BREL) report, providing photo evidence of thermal continuity and quality of insulation.

Knauf Insulation’s guide includes key information on Part L, example whole-house recipes for compliance*, and advice on U-value and Psi-value calculations. This edition also looks at the bigger regulatory picture, with handy infographics on Parts B and O, as well as insights into upcoming regulations, like the Future Homes Standard.


Neil Hargreaves, Managing Director for Knauf Insulation Northern Europe, says: “I hope this guide will be a valuable tool, not only for achieving compliance, but in raising the bar for quality and performance across the housebuilding sector.”

The Housebuilders Hub

The updated Part L Guide is a recent addition to Knauf Insulation’s online Housebuilders Hub, where industry professionals can find free tools and guidance on Part L and the wider housebuilding sector.

The Hub is also home to a U-value calculator, Psi-value calculator, product information, and a range of useful Q&As on topics like energy efficiencyfire safety, and sustainability. It is free to access, and visitors have the option to subscribe for notifications when new tools and resources are added.

Download Knauf Insulation’s Part L Guide from its Housebuilders Hub at

*Example recipes have been produced using SAP 2012 software and are intended for illustrative purposes only.

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