Important CHANGES TO PART L of the Building Regulations – England
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Important CHANGES TO PART L of the Building Regulations – England

Please note: Information provided in this blog is correct at the time of writing.

The Government has announced changes to Part L of the Building Regulations - England which will come into effect on June 15 2022. The changes are designed to reduce the amount of carbon emitted from our buildings by 30% when compared to current levels. This will have significant implications for the design and construction of buildings - including doors and façade systems.

​​​​​​​What does Part L mean for the industry?

The new legislation means that thermal regulations for windows and openings will change. The current U-values for the thermal transmittance of doors and openings into all settings, including both new and existing buildings, will be upgraded.

What will the U-values be for new dwellings from June 15, 2022?

The U-value will be 1.6 W/m2k for windows and doors, including glazed doors, in new build properties.

What will the U-values be for existing dwellings from June 15 2022?

The U-value will be 1.4 W/m2k maximum for windows, 1.4 W/m2k maximum for doors with more than 60% of internal face glazed, and 1.4 W(m2k) maximum for all other doors.

What will the U-values be for commercial buildings from June 15 2022?

The U-value will be 1.6 W/m2k for windows in buildings that are similar to dwellings, and 1.6 W/m2k for curtain walling, and pedestrian doors.

Implementation extension for timber windows in existing dwellings until 14 June 2023

For timber windows, a maximum U-value of 1.6 W/m2k or Window Energy Rating Band C is permissible until 14 June 2023. From 15 June 2023 the full standard of 1.4 W/m2k or Window Energy Rating Band B applies.

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Further information

Further information from the UK government concerning the changes to Part L of the Building Regulations – England can be found here.

Solarlux Quality Partners and Partners can calculate the U-value of a Solarlux bi-folding or cero door by using the handy calculator on MySolarlux. To register for MySolarlux click here; if you are already registered you can go directly to our easy to use U-value calculator in mySolarlux