Building Regulations: Part L
Setting the Standard for Improved Energy Efficiency in Buildings
Building Regulations Approved Document Part L covers the conservation of fuel and power in the construction of new and existing buildings in England and sets the energy performance standards of existing buildings.
The built environment contributes approximately 40%1 of UK greenhouse gases, 17%2 of which is estimated to emanate from buildings.
Improving the energy performance of buildings will not only limit greenhouse gas emissions, it will potentially reduce the energy usage in occupation. To help achieve this and meet the government’s net zero target, in June 2022, Building Regulations Part L underwent its biggest shake-up since 2013.
The updated Building Regulations Part L focus on improving the energy efficiency of new homes through a fabric-first approach to design and the use of renewable technologies such as heat pumps. The overall aim of this hybrid solution is to reduce the carbon output of new dwellings by 31%.
Crucially, the new building regulations include a tightening of standards for already-built homes in relation to extensions and upgrades. The implementation of the Part L changes has a more stringent transition period compared to previous versions. The interim amendments are a precursor to the Future Homes Standard (FHS) and Future Building Standard. Due for full implementation in 2025, the FHS requires new homes to produce 75-80% fewer carbon emissions than properties built to the previous standard.
Part L - Discussion on Fabric first and how will it contribute to Net Zero
In this concise, easy-to-follow guide, our technical teams highlight key interim Part L changes and how they apply to new-build properties and renovations to existing buildings across the UK. Future Homes Standard energy requirements are also detailed, as well as insulation specification guidance to help you choose the right products and create the ideal thermal envelope.
