Our passion

We’re passionate about manufacturing truly authentic designs of traditional sash windows. We’re dedicated to creating beautiful styles that capture three hundred years of history, that suit the home in which they are installed, perfectly. 

Since 1988 we have dedicated enormous resource into making sash windows that replicate the designs and recreate the magic that only this style offers. Ours are as true in appearance to the originals as it’s possible to be.

We will make any design of sash window you need, we just want you to enjoy windows that work well, are energy efficient and secure and provide years of trouble-free usage.


Too many people choose windows on price alone. This never delivers great quality; owners invariably end up with products that quickly fall apart or degrade their home’s character.

If you’re a homeowner, you’ll find we’ve created authentic products that are far more secure, thermally efficient and require substantially less maintenance than your existing windows. You must decide which of our three Bygone sash window ranges, or four trade ranges best match your needs.

If you’re a trade installer buying sash windows for clients, you’ll find four trade ranges and a comprehensive range of colours, styles and designs. This will provide them with real choice, along with sensible pricing, delivered to you free*, complete and on time.


Finding trustworthy suppliers and installers can be a daunting prospect. Purchasing windows isn’t something you do every day so it can be confusing when every company is claiming their products are the best.

Most people would like beautiful, real sash windows that are secure and energy efficient, however they have to look right and the workmanship must meet your expectations. Homeowners want the best windows they can afford, so it’s important to explain why sash windows are more expensive than casements:

  • In general terms, trade “supply-only” prices of sash windows are two or three times those of casements. This is because there’s twice as much steel and profile used and considerably more hardware and fittings needed.
  • Fitting charges are generally higher because sash window replacement requires the old box to be removed. This means there are fewer windows to spread the costs over – often just two windows per day, not five or six.

So if you are changing windows in your home, it is vital you understand what is being offered within the prices you are quoted because you may find someone who is cutting corners, offering casements, rushing the fitting or who lacks any passion for your property.

Most people appreciate that quality products generally cost a little more; using careful installers who take more time is slightly more expensive. Windows that incorporate prettier finishes, better insulation and stronger furniture cost more than standard styles.

As an installer or homeowner, you can be assured that these windows will work. They are robust, well-constructed and renowned for reliability, so you’ll avoid service calls.


We never stop making improvements. Through continuous commitment to innovation, we’ve come up with some pioneering techniques in crafting the best sash windows. We design novel new components like foam draught baffles, foam cill pads, Georgi® clips and balance retaining clips to crack previously problematic production flaws.

Knowing exactly what goes into our products enables you to be fully informed so that you can justify investment in a quality product. For our obligation-free Buyer’s Guides, Glossary of Terms and video library access just fill in our enquiry form below.

*standard deliveries, not special requests

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 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

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<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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