u-value calculator for uvalue calculation of Windows and Doors

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Accurate U-value calculations for windows and doors

Our uvalue calculator gives accurate u-values for bespoke designed windows and doors. The calculated value conforms to Part 1 of the standard BS EN ISO 10077. Our calculation enables our customers to get the information they require to comply with Building Regulations for the low cost of £35. No membership is required to use our service.

Inexpensive Calculator for small manufacturers

Getting an accurate u-value for a bespoke manufactured window or door can be extremely expensive for small independent manufacturers. We provide that solution for only £35 and you do not need to pay any additional membership fees either.

A u-value obtained from us should be sufficient to satisfy the requirements of Building Regulations. Please note that our calculation is based on Part 1 of the standard only. It cannot be used as the basis for obtaining a full BFRC Window Energy Rating (WER). WER requires a u-value that complies with Part 2 of BS EN ISO 10077. We do not offer such a service.

All types of Wood

Our calculator works with ..put something here Doors or windows can be made from either hardwood, softwood or accoya, they can be of any size fitted with double or triple glazing. If you can provide us with the u value (of any other type of frame you are using) we can provide a u value for that too.

Our uvalue calculator is not restricted to products manufactured by one company.

Simple 3 Step Process

Submit Details

Simple to Use

Fill in the boxes on our form. Specify the frame size, type of wood, spacer, the type of glass and size of the panels. We then calculate the U Value of your product using our specialist software and send you a certificate which specifies the u value of your product. This certificate can be used as formal support when you supply U-value information to potential customers or Building Control.

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