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U-Value Calculator
System company data pre-loaded on the Oracle

Window Energy Ratings – the Oracle U-value calculator can help find the right glass and frame combination for your WERs.

How it works
Calculations from the Oracle online U-value calculator are recognised by FENSA and Certass for their competent person schemes. Once subscribed it’s quick and easy to assess product performance and is pre-loaded with product data for many popular window and door set suites from major PVCu window system companies.
FAQs
How do I calculate a window U-value?
The U-value of a product provides vital information about a product’s heat loss and overall heat transfer performance. Getting your product’s U-value right is an important part of successfully achieving your CE Mark, but it can be a complex process. At Build Check Publications, we have developed the Oracle U-value calculator which subscribing members can use to quickly and easily calculate their own U-values for windows and doors to demonstrate Part L compliance. The Oracle U-value calculator can also help companies identify the right glass and frame combination for their Window Energy Ratings. The calculator is pre-loaded with product data for many popular window and door set suites from major PVCu window system companies and composite door system manufacturers. Calculations from the Oracle online U-value calculator are recognised by FENSA and Certass for their competent person schemes. Because we are accredited by UKAS, the calculator provides U-value information to the required industry standard. For more information about The Oracle, please click here. If you would like support with completing the CE Marking process, please contact Build Check on 01494 452713 or by email at: info@buildcheck.co.uk
What does an Annual Oracle subscription include?
For £300+VAT, The Annual Oracle subscription includes • Unlimited Access to Both the U-Value and Acoustic Calculators • A Private dedicated section to store your product Calculations • Guides and Templates for completing your own CE Marking.