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Our accredited network of installers offers the highest quality uPVC and aluminium products with excellent customer service.

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Fabricator of the year badge Casment Windows
Deceuninck The Residence Collection

uPVC Windows

View our wide range of Deceuninck and Residence 9 uPVC Windows

Industry leading uPVC manufacturers of Deceuninck windows providing energy efficiency, security and aesthetics.

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Fabricator of the year badge White uPVC Bi-Fold Doors
Deceuninck DoorCo The Residence Collection

uPVC Doors

View our extensive range of Deceuninck uPVC Doors.

Strong, stylish and highly secure Deceuninck uPVC Doors.

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Fabricator of the year badge Aluminium Windows and Doors
Secured by Design Aluminium Bi-Fold Doors


Choose from our wide range of aluminium windows and doors.

Durable & energy efficient aluminium products from Smart, all manufactured in-house by Sternfenster.

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Fabricator of the year badge StyleLine Windows


Exquisite and unique graf-welded uPVC windows and doors exclusively from Sternfenster.

View our range of unique StyleLine windows and doors exclusive to Sternfenster.

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Sternfenster Window Systems

Leading ManufacturerTrade Supplier of uPVC & Aluminium Windows & Doors

Why Choose Sternfenster?

Manufacturing for 40 years

Manufacturing For 45 Years

Family run business, established since 1974 with over 45 years industry experience

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Competitive Prices

Competitive Trade Prices

We offer a wide range of uPVC and aluminium products at the most competitive trade prices

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Exclusive StyleLine Products

Exclusive Products

1st fabricator in the UK to offer a seamless weld on all uPVC windows and doors

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Approved Installer Network

Approved Installer Network

Our network of Approved Sternfenster installers provide an excellent service

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Exclusive Windows and Doors

We are the first fabricator in the UK to use the state-of-the-art Seamless Quad Welder, using a revolutionary welding process in manufacture.

Gain a competitive advantage today with our exclusive range of exquisite, seamlessly finished windows and doors.View our extensive range of beautiful StyleLine windows & doors to see the difference.

View StyleLine Page

Exclusive Windows and Doors

We are the first fabricator in the UK to use the state-of-the-art Seamless Quad Welder, using a revolutionary welding process in manufacture.

Gain a competitive advantage today with our exclusive range of exquisite, seamlessly finished windows and doors.View our extensive range of beautiful StyleLine windows & doors to see the difference.

View StyleLine Page

Industry Leading Manufacturer

  • Sternfenster Plus

    Sternfenster Plus

    Pricing, marketing support, order tracking and more. We offer an easy to use and simple to understand service that will enable you to grow your sales, reduce call backs, reduce after sales and promote your brand image in a way that truly stands in line with your ideals.

  • Express Lead Times

    Express Lead Times

    Our express lead times allow you to offer your customers more, more frequently. We always deliver on time, on spec and on budget to ensure you can keep your business running smoothly and efficiently. We stand as the smart way to achieve customer satisfaction.

  • Accredited Products

    Accredited Products

    Fully accredited, quality made windows and doors allow you to uphold your reputation as a prestigious double glazing installer. We only offer the very best home improvement solutions so you’ll be able to benefit from the peace of mind that you are offering the best.

  • 24 Hour remake service

    24 Hour Remake

    Our no fuss 24 hour remake policy means that should you experience a change in your project, you’ll be able to get things back on track as soon as possible. We don’t compromise on quality, ensuring we always deliver how you need it and when you need it.

  • Nationwide Delivery

    Nationwide Delivery

    We offer UK wide on time delivery for all of our Approved Installers. We have a comprehensive network of hubs across the nation, which allows us to quickly and effectively accommodate the needs of all of our Network Members, wherever they are.

  • Painting Service

    Painting Service

    Offer your customers a wide range of colours via our in house spray painting facility. This means that we are able to offer a comprehensive selection of bespoke colours, allowing you to widen your customer demographic and increase the potential for more sales.

  • uPVC & Aluminium

    uPVC & Aluminium

    We offer a comprehensive range of uPVC and aluminium windows & doors, offering a selection of market-leading home improvement solutions that are set to complement any and all properties. Whether you have a new build, heritage or traditional home, we’ll have something to suit you.

  • Attractive Finishing

    Attractive Finishing

    All products are inspected and hand finished to ensure they uphold the highest standards of performance and aesthetic. Not only does this ensure that any option you choose will be a worthwhile investment, it also ensures they are set to last the test of time even after extensive use.

  • Variety of options colours styles

    Variety Of Options

    Capture your perfect home improvement appearance via our wide range of styles, colours & finishes. This way, you’ll be able to tailor your new addition to your tastes and property style in a simple and easy way. All colours are applied with a powder coating to ensure durability.

  • Competitive Prices

    Competitive Prices

    We are proud to offer competitive prices for attractive and secure windows & doors. You’ll be able to enhance your property with a premium product without having to pay the extortionate price. A member of our team will be able to offer you a tailored price based on your specifications.

  • Accredited Products

    Accredited Products

    Enhance your home with fully accredited, quality made windows and doors. All of the options we offer homeowners have been tried and tested to ensure they offer leading standards of thermal efficiency, security and durability. You won’t have to settle for less when your enhancing your home.

  • Painting Service

    Painting Service

    Our innovative, contemporary in house spray painting facility allows us to accommodate a wide range of personal tastes and colour requirements. We also offer an intelligent dual colour option that allows you to complement both the interior and exterior of your home simultaneously.

uPVC Products

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  • uPVC Windows
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  • uPVC Doors
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  • The Residence Collection

Aluminium Products

Approved Installer Network

Our UK wide approved installer network comprises of local, reputable double glazing installers. Sternfenster approved installers have years of experience fitting uPVC and aluminium windows, doors and conservatories. Our trustworthy installers have been vetted and approved by us so you can expect exceptional products, services and aftercare. Find your nearest double glazing installer today to see their latest products and offers.

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Bespoke Spraying Service

Our in-house spraying facility allows us to supply uPVC and aluminium windows in over 250 RAL colours in satin finish. We offer a fast turnaround on colour frames and can match virtually any colour.

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New State of the Art Aluminium Factory

At Sternfenster, we have invested in a brand new, 35,000 sq. ft. aluminium factory to accommodate the high demand for high quality aluminium windows and doors.

We offer a comprehensive range of aluminium products, including Smart aluminium windows and doors, commercial shop fronts and curtain walling, as well as aluminium bi-folding doors in any configuration.

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Latest News

Mike Sternfenster

Open Letter: The Importance of Margin Protection

It’s great that everyone is busy but we face a number of challenges – and I don’t only mean those impacting the supply chain. The net ...

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Mike Sternfenster

Putting People First

Mike Parczuk explains more about new initiatives that have been introduced to improve the mental health and wellbeing of staff, as part a vision ...

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