Masterframe Windows is one of the very few vertical slider manufacturers to have achieved the British Board of Agrément “Whole of Life” performance tested status for all the sash windows it produces. The onerous 20, 000 cycle endurance test simulates a “whole of life” test to prove longevity and guarantees a full BBA approval. This means that every single component, even the balances and window furniture is subject to this third party scrutiny.

To explain what their certification stands for and the considerable weight it carries in the industry, the BBA website describes it as follows “BBA Agrément Certificate is a mark of excellence based on rigorous national and European standards that validate a construction product’s specialist formulation, capability and uniqueness. Certification is an achievement that delivers the power of product confidence, industry satisfaction and market leadership.” Read more about the BBA here

However, the most important thing about this certification is that once it is achieved, it does not end there. The company must consistently prove, at BBA audits twice annually, that the product is being manufactured to the same quality standard as originally specified and agreed.

Ray Rabett, Technical & Compliance Director for Masterframe Windows says “We were very pleased to receive a clean bill of health as a result of our recent BBA audit on 12 April 2021. The audit was carried out remotely, but with the same detailed checking processes in place to ensure that we had not dropped our quality standards in any way.

This includes checking that windows are being made to the same size and specification as originally tested with the correct reinforcement, using the same materials as documented and agreed, with all the same checks and balances in place for quality control. Factory conditions, storage conditions, processes and records are all checked in great detail and even the position of screws are tested for conformance to the original Quality Plan.

The outstanding advantage for our trade and commercial customers is that they are assured of a consistent quality product that has been scrutinised by a third party from start to finish. They can therefore return to Masterframe time and time again with great confidence, knowing that the high standards of quality will not alter.”

Masterframe Windows is committed to product and service excellence and have several other accreditations which can be viewed here:

If you are looking for a specialist, award-winning sash window manufacturer, please speak to our knowledgeable sales team on 01376 510410 or e-mail