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Energy Ratings & U Values for Doors & Windows

From October 2010 all new doors will have to adhere to a door U Value rating of 1.8W/m2K or less. Each and every door that Just Doors UK supplies and delivers is U value compliant.

Just Doors UK are dedicated to not only making sure our doors are fully U value compliant, but also our customers understand as much as they can about the new 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.

Fitting (a) Standard for new fittings in new dwellings (b) Standard for replacement fittings in an existing dwelling
Window, roof window and roof light U-Value = 2.0W/m²K U-Value = 1.6W/m²K or Window Energy Rating = Band C
Doors with more than 50% of their internal face area glazed 1.8W/m²K 1.8W/m²K (or exempt if fitted into existing door frame)
Other doors 1.8W/m²K 1.8W/m²K (or exempt if fitted into existing door frame)

Energy Efficient External Doors

In the coming year additional pressure is going to be put on everyone to become more energy efficient. Whether this pressure comes from governmental bodies or customers just wanting to get on top of the rising energy costs, energy efficient doors will need to feature in your plans.

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 logical 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.

All doors supplied by Just Doors UK meet the strict new U value heat loss standards.

Window Energy Ratings (WER)

The Window Energy Rating (WER) tells you how energy-efficient the windows are. The rating system is based on a scale of G to A+, with A+ windows being the most energy-efficient.

The Liniar window system we offer is capable of achieving a Window Energy Rating (WER) of A+13 using a double glazed glass sealed unit and when A+ is specified! We are not aware of another window profile system in the UK that can currently match this outstanding level of energy efficiency.

A WER Rating
A+ WER Rating