U Value Calculator for uvalue calculation of Windows and Doors

Accurate calculation of u-values for windows and doors

Our uvalue calculator is a whole window calculator designed to calculate an accurate u-value of bespoke design windows and doors. This calculated value conforms to European Standard EN ISO 10077. This standard applies in Scotland and England.

Calculate accurate u-values for bespoke designed timber / wood windows and doors. The doors or windows can be made from either hardwood or softwood, they can be of any size fitted withdouble 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 to Use

You filll in the boxes on our submit details form. Completing the form Supplies us with the dimensions of the window/door and specify the type of wood, 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 4 page certificate which specifies the window u value or door 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.

No Membership Required

We do not require you to sign up for any sort of membership to use our uvalue calculator. It costs just £35 for a calculation and for that we will send you a four page pdf certificate (usually the same day) that shows the information you submitted to us, and the calculation we have used to work out the u value of your window / door.

Our certificates can then be submitted to your planning department to show that your product complies with Building Regulation requirements.

Why you require U Values - An explanation

From 1st October 2010, window manufacturers needed to show that their windows complied with the energy efficiency requirements in the latest 2010 revision of Part L of the Building Regulations and the Approved Documents L1A (new dwellings) and L1B (existing dwellings).

Obtaining a precise U-value for a manufactured window can be extremely expensive especially for smaller manufacturers or architects with bespoke designs. U Value Calculator is able to calculate the u value for timber framed windows and doors at a very reasonable cost.

Architects and specifiers are now increasingly asking for the thermal transmittance values of windows, so that they can calculate the SAP ratings of the buildings where the windows are to be fitted. Clients require that value for completion certificates.

If you cannot provide U-values for your products, then they may have to use the windows of a competitor who does have that information to hand.

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