Your home is your biggest asset. Deciding the right style and design of windows to retain the character of your home is not something to be taken lightly. 

You’ve invested a substantial sum buying your home, so any improvements must enhance your property and be long-lasting.

PVC-U sash windows


While some companies specialise in fitting windows and others try to make everything themselves, we make one product and one product only – beautifully crafted, authentic sash windows for homeowners like you.

We’re passionate about creating traditional products that replicate original box sash windows, as far as materials allow.

You have more choice than window installers lead you to believe. Most either steer clear of offering sashes, because they demand high standards of fitting, or they have limited knowledge about them, so you don’t get the full picture.

Because authentic sash windows cost considerably more to make and install than casements, they are often afraid to suggest them. However, your home will lose vastly more value if you make a poor decision.


Every window we manufacture is bespoke to your exact requirements; we draw on nearly 400 years of history so we’re confident that within our product ranges you’ll find a style to suit your home.

You can also add stylish details according to your needs; putty line glazing, concealed gaskets and drainage, internal and external staff beads and one-piece run through horns along with numerous ‘timber’ acrylic finishes.

You can choose double or triple glazing. You can also specify:

  • energy efficient glass
  • low iron glass
  • toughened safety glass
  • noise reduction glass, such as Stadip Silence®
  • acid etched glass
  • coloured lead lights
  • unusual patterns

Security can be further enhanced using Secured by Design (SBD), the Police preferred standard of security. A large selection of handles, cams and window furniture provide further choice.


We urge you to spend a little time finding out about the choices you have, and the selection process you adopt to find a suitably qualified installer for your new sash windows, as they demand the very highest installation methods.

We know that some double glazing companies show clients our brochure, then order cheap alternatives, hoping you don't notice!

Masterframe have a large range of sash windows and we're proud of our relationships with installers across the country. We have a large selection of sash windows that any company can purchase, to install into your home, however you are reliant upon their workmanship and guarantees.

If you are looking to replace sash windows and decide to use one of our approved installers, then we, as sash window manufacturers, will guarantee your sash windows directly and the workmanship of the installer replacing them. It is vital however vital that you ensure they appear on this web site; otherwise they are NOT an approved Bygone Partner and we cannot guarantee the installation.

Choosing windows for your greatest asset requires some serious thought. To make the process easier we’ve created a series of Buyer’s Guides, Glossary of Terms and have videos to explain the importance of good ventilation and security. 

Avoid destroying your home’s character with inappropriate casement styled, mock sash windows that are a far cry from the real thing. Speak to us or an approved installer and we will help explain the choices you have and the designs available to ensure your new windows blend in so well, that they’ll go unnoticed.

Testimonial Michael Hagan

Aztec Windows (Coventry) Ltd, Coventry

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

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

Call Jack Sellick on 01376 510410 to request our informative Conservation Guide.



Learn why you get better windows because of these

  • BBA logo
  • ISO logo grey
  • Secured by design logo grey
  • BFRC logo grey
  • 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>
  • DGC logo grey
  • CE logo grey
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