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.
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