From October 2010 building regulations in Great Britain specified that all new doors would have to adhere to a door u-value rating of 1.8W/m2K or less. Windows in new dwellings would have to have a u-value rating of 2.0W/m2K or less and replacement windows would have to have a u-value rating of 1.6W/m2K, or have a minimum WER rating of Band C.
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.