Building Regulations 2021 edition, Approved Document L has been updated to cover limiting heat gains and losses. The new rules related to the standards for fabric performance of building elements came into effect in June 2022 and cover minimum U-value requirements. Windows in new dwellings now have to have a u-value rating of 1.6W/m2K or less.
Our calculator is designed to easily calculate the u-value of windows and doors to see if they comply with these regulations. Our calculator does not restrict you to using products from any specific manufacturer. nor do you not need to be a member of our site or download any additional software.
We can calculate the u value of single, double or triple glazed windows built with softwood, hardwood or accoya frames. If you can provide the u-value for any upvc frame then we can work out a u-value for that too.
We can make adjustments for window and doors with or without spacers and any thermal bridges used in the installation.