GN49 Changes to Approved Document L2 Buildings other than dwellings
This four-page guidance note provides an overview of changes to Approved Document L2: Buildings other than dwellings within Part L of the Building Regulations, which had not been updated for nearly a decade. It covers the new emphasis placed on the adoption of a fabric first approach, with higher minimum fabric standards for the external envelope and improved airtightness, along with the use of low-carbon heating technologies. The document provides U-values for the Notional Building, the difference between existing and new U-values and the thermal upgrades required for refurbishment projects. This guidance applies to England only.
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