Our U-Value calculator is a whole window calculator designed to calculate an accurate U-Value of windows and doors. This calculated value conforms with BS EN ISO 10077 Part 1.
We can advise on how you might achieve the required standard. A U-value calculated by us should be sufficient to satisfy the requirements of Building Regulations.
Our calculator is primarily intended for use with wooden windows and doors. These can be made from hardwood or softwood, of any size with double or triple glazing. If you can provide us with the r-value of any other type of frame you are using we can provide a u-value for that too. Our u-value calculator is not restricted to products manufactured by one company.