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Note: Before we carry out any calculation you must have paid the appropriate fee.

The cost of our U Value service is £35 per certificate.
Payment is by bank transfer to
Account Number 74111522  (Starling Bank)
Sort Code 60-83-71
Reference Your Company Name.

Alternatively, you may pay using Paypal. Send £35 using the button below

U Value calculator designed to calculate the U Value of timber wood framed windows and doors.