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Who We Work With

At Masterframe, we supply the entire chain of supply, installation and customer with solutions, this ensures our product retains full quality control from start to finish.


Your home is your biggest asset. Choosing a style and design of window that fits your property’s character is not something to be taken lightly. We can offer you the advice you need.


Your reputation is as important to us as it is to you. We make a wide range of sash products and deliver them complete and on time, in our own vehicles.

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As manufacturers, we understand the difficulties of making everything yourself. As a niche producer, we’re ideally placed to free up your production, increase your efficiency and supply you with bespoke, own-label products.



Whether your project is self-build or you’re a national PLC, sash windows increase the perceived value of new homes. Choose from beautiful sash windows – either bespoke designs or value-engineered solutions.

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New build or refurbishment, the unique problems of your project require creative solutions. We can adapt every component to suit your specifications. Our products are CE marked and building regulation compliant.

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You need to protect homes from owners installing cheap double glazing. Ugly, inappropriate and unsympathetic designs destroy conservation areas, Article 4 and other listed properties. Find fenestration solutions that fit their environment.

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The Lengths We Go

We understand you trust us to deliver promises you have made to your customers. It is a rare event when we fail a customer but it is NEVER because we stop trying. We pull out all the stops to honour our commitment to you and guarantee to keep you informed if there’s a problem.

Highest Standards, As Standard

Large national organisations that make thousands of windows each week have immaculate production procedures and set very high standards.

When they outsource their sash window needs they expect suppliers to meet these standards.

Each time we are asked, any higher standard set as a result becomes the new minimum that we make every window to and not just those for the nationals.

Hassle-free Innovations

We don’t stop there either, every day we look at minor problems or customer feedback to improve our products or eliminate issues. That’s why we invented self-adhesive foam cill pads to prevent any chance of water ingress, foam baffles to reduce air infiltration pads, balance retaining cills to secure balances for life, two-part pivot bars and even strapping for carrying handles to make handling on site easier.

A Supply Partner You Can Trust

As the UK’s longest established company dedicated to PVC-U sash windows, we’ll do what we can to help you win orders. If things don’t quite go to plan, we really do help sort it out. We’re just a phone call away.

Trusting any company with your client’s order, you need to be certain they will deliver, on time and in full. You should always use a dedicated sash manufacturer for two important reasons:

If a company makes everything, they don’t invest in bespoke solutions to overcome system weaknesses, nor do they offer anything other than standard solutions.
Most casement fabricators actually sub-contract their sash windows. You pay an extra margin for someone else to make your windows.

If you’re looking to buy sash windows for the first time or considering changing your current supplier, we come with excellent credentials:

Fabricator of the Year: twice winners of this prestigious award
Winners of National Fenestration awards for Timber Alternative Company, Fabricator/Manufacturer and New Product of the year for Timberweld®
Numerous Customer Care and Energy Efficiency awards
Over 25 WER certificates, including the first five ever issued
The first PVC-U sash to gain Secured by Design accreditation
BBA certificates for the whole window, even the plant on Georgian bars
ISO systems and process controls across the business
CE marking for all standard products; as you’d expect
We look forward to hearing more about you – simply enter your contact details below and we’ll be in touch.