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From October 2010 all replacement windows installed must have a 'U' value of 1.6Wm2K or lower. Alteratively a 'BFRC' (British Fenestration Ratings Council) rating of 'C' or better.
All our PVCu windows achieve a 'U' value of 1.34Wm2K. This is eqivilent to a BFRC rating of 'A+4'.
A full report of our windows performance is here â€‹

We put a label for 'FENSA' inpection purposes on all our windows meeting the above requirements. This label is usually found in the sash rebate and displays the 'U' value and this website address, to create a link to the above report for 'FENSA' approval purposes.