We admit we’re a little obsessed!

Loving sash windows as we do, we hope that you’ll appreciate the time that’s been devoted to ensuring our styles are as authentic as possible.

We steer clear of making casements, doors or patios. We found our niche and decided to stick to what we do best, making one product and one product only – stunning sash windows.


Masterframe founder Alan Burgess pioneered a new direction for the design after helping create the UK’s first dedicated PVC-U box sash in 1984. Shortly afterwards he set about creating a market for PVC-U sash windows.


We tend to work on a wholesale basis, supplying other companies with own brand sash windows and installers with bespoke solutions.


Dedicated to retaining the elegant proportions of traditional windows through continuous innovation, creative flair and passion, you can be confident we set extremely high standards with excellent craftsmanship and attention to detail.

You’ll find we’re not cheap. Indeed we’d go so far as to say we’re considerably more expensive than other sash window producers. That’s because we include more, do more and taking like for like, you can expect us to be excellent value for money.


You set the standards with your own specification, the benchmark you expect your new windows to attain, using the components you require and that you believe are right for your project. We will help you understand what is important and set out to exceed all expectations.

As conservation officers across the UK have found, if you decide to invest in our products, your perceptions of PVC-U will probably change for good.


  • Our series of sash window Buyer’s Guides, Glossary of Terms and video library access are all available, obligation free, to enable you to make an informed choice for your home – just fill in our enquiry form below.


  • Hopefully they demonstrate we’re not your average double glazing company. Whether you are building your dream home, refurbishing an existing property or you are an installer of sash windows our products can help retain the character, charm and beauty of existing sash windows or create an authentic environment for your new property.


Thank you for visiting the Masterframe website. Homeowners please visit the Bygone Collection

Call on 01376 510410 to request our informative Conservation Guide.


Become a preferred Bygone installer

Can you demonstrate the same care and attention to installation as we have to our products?

Apply to be an installer

Testimonial Angie Hunter

Wonderful Windows

“Masterframe sash windows are by far the best on the market, not only is the product excellent, but the staff are also extremely helpful and attentive, nothing is ever too much trouble and they go above and beyond to assist you.  Without fail, delivery is always on time and when expected.  I lierally cannot recommend this company highly enough."

Testimonial Tommy Rose

Barnet Window Company

“I’m always so impressed with the service from the entire team at Masterframe. Recently, I called the office while I was with a customer. I needed some information quickly, to help me to close an order. With an average window supplier I wouldn’t usually make this call, as typically I can wait hours or even days for the right information, but I knew Masterframe would react straight away with the right information. In this instance Carol and Jane between them had an email over to me within minutes, and my customer was very happy. Top quality service from knowledgeable staff as always. Thank you!”

Testimonial Angie Hicks

Kingfisher Windows (Wedmore) Ltd

“It is so refreshing to deal with a Company who cares.  We get updates if there are any slight changes; they follow procedure, and will not go forward with an order unless it is signed off.  You know exactly what you are getting and when it will arrive.  The quality is always first class with everything you need to fit their beautiful sash windows arriving at the same time.  We have been a preferred installer for many years now and would not even think about going anywhere else for our sash windows.“

Testimonial Graham Dawson

Snowdonia (windows & Doors) Ltd

“The new literature looks amazing and keeps Masterframe ahead on the competition as the leading manufacturer of box sash windows".

Testimonial Michael Hagan

Aztec Windows (Coventry) Ltd, Coventry

“Exceeded our expectations, far superior quality and exemplary service!”

Learn why you get better windows because of these

  • BBA logo
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  • Secured by design logo grey
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  • Energy Trust logo Grey
<h3>Setting standards, safeguarding interests</h3>
<p>Masterframe have been GGF members since the mid 90s. Our MD has served on the GGF main board and chaired the Home Improvement Executive, FENSA and the BFRC. Membership gives you greater protection on a number of levels.</p>
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