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Energy Ratings & U Values for Doors & Windows

Since October 2010 all new doors will have to meet a door U Value rating of 1.8W/m2K or less. Each and every door AWM Windows and Doors supplies is U value compliant. We do however always give you the option to superceed the standard requirements by upgrading your glass to Thermal Spacer Bars – A Rated Glass giving a U-Value of 1.4W/m²K

AWM Windows and Doors are dedicated to not only making sure our doors and windows are fully U value compliant, but also our customers understand as much as they can about the regulations. We have created this U Value section to remove confusion and promote informed decision making.

The following information summarised from Building Regulations Documents L1A (New Dwellings) 2010 & L1B (Existing Dwellings) 2010.

Window, roof window and roof lightU-Value = 2.0W/m²KU-Value = 1.6W/m²K or Window Energy Rating = Band C
Doors with more than 50% of their internal face area glazed1.8W/m²K1.8W/m²K (or exempt if fitted into existing door frame)
Other doors1.8W/m²K1.8W/m²K (or exempt if fitted into existing door frame)

Energy Efficient External Doors

In the coming year the regulations are due to change once again. From July 1st 2022 the UK are looking to reduce the carbon footprint by up to 30%.

The latest revisions to building regulations mean energy efficient doors will be made mandatory. As an imminent introduction of the U value for doors means all new doors will need to have a value of 1.8W/m2K or less (the current standard for energy efficient windows). We think this is a good step as there’s not much point in insulating your roof and walls and having ‘A’ rated windows if your door isn’t energy efficient too – heat will find the least insulated point and escape through it.

When the new regulations are applied, we will update this page accordingly.

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