Part L Compliance: What It Means for Rooflights & Roof Windows

In 2021, changes were made to Building Regulations: Approved Document L which affects building work on both new and existing buildings in England from 15th June 2022.

23.05.2025

Whitepaper

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Glazing Vision Approved Document L Whitepaper

In 2021, changes were made to Building Regulations: Approved Document L – Conservation of Fuel and Power which affected building work on both new and existing buildings in England from 15th June 2022. The government announced a number of changes to the Building Regulations to help the UK deliver net zero, including a mandatory 30% cut in carbon for all new homes, and a 27% cut for other buildings, including o ices and shops. These changes have meant necessary amendments have had to be made to the Approved Document.

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The comprehensive Glazing Vision Part L Whitepaper focuses on the requirements for glass rooflights and roof windows in relation to Approved Document L, including:

Limiting heat gains and losses in rooflights and roof windows
Calculating the target primary energy rate, target emission rate and target fabric energy efficiency
Work to rooflights and roof windows in existing dwellings and buildings