As the UK’s longest-established manufacturer focused on just one product, our passion for sash windows sets us apart. We’ll happily work with you to find the ideal solution for your project.

As an installation company, if you’re looking for a trade supplier of excellent value sash windows, fitting instructions, samples or professional quotes for your customers, then this site is for you.

Oxford English Dictionary defines a specialist as, “someone dedicating resources on one product, to the exclusion of all others” that makes Masterframe, absolute specialists, making just sash windows.

Known to “enhance and improve” conservation areas and described by independent planning inspectors as, “indistinguishable from timber originals, even at close quarters”.

Don’t be disappointed! Some companies have been known to show our brochure to prospective clients, only to substitute the order with inferior alternatives. If you’re in any doubt, speak to us direct.