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

Trade Customer

Access our latest technical information, product content, video archives, media centre, Sternfenster Plus and much more.

Sternfenster Training Academy


Leading Products, Exceptional Marketing and Unbeatable Warranties when you Start Selling Sternfenster

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Start Selling Sternfenster


As one of the UK’s largest trade fabricators of uPVC and Aluminium, Sternfenster are proud to offer installers market leading, innovative products that have been trusted by homeowners and tradespeople alike for over 45 years! Our exceptional products, fabricated in our state of the art factory in Lincoln, are just one of the many reasons to Start Selling Sternfenster to your customers.


As a family run business, establish in 1974, we have always invested an exceptional amount of effort into our extraordinary network. Part of our commitment to our installers is reflected in our ability to deliver outstanding quality with the fastest lead times possible.



Selling Sternfenster is more than just installing our products. We have an extraordinary range of benefits on offer to ensure you are delivering the best possible services to your customers and clients. From exclusive marketing and training materials to exceptional aftercare services and warranties, it is no wonder installers throughout the UK continue to invest their trust in Sternfenster.


Gain access to our exclusive Sternfenster Training Academy when you Start Selling Sternfenster! Learn all about installing our products in this unique hands-on course!

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Leading uPVC, Aluminium & Glass Fabricators!

We are one of the UK’s largest trade fabricators of high quality uPVC, Aluminium Windows and Doors.

A Partnership That Works

G19 Fabricator of the year

We were honoured to be named G19’s Fabricator Of The Year in 2019’s G19 Awards!


Competitive Trade Prices

Sternfenster are committed to offering the highest quality at the most competitive trade prices.

Marketing Offering

Fast Lead Times - From 5 Days!

We offer exceptionally fast lead times as low as five days, without compromising on quality.

Our Product Range

Easily Order uPVC & Aluminium Online

We have a fantastic online system which makes ordering your uPVC and aluminium products easier than ever!

How We Do Business?

Innovative SFPlus Order Tracking & Quotes

Our exclusive SFPlus intranet is the perfect way to track your orders and get free quotes online.

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Exclusive Media Hub: Videos, Installation Guides & More!

We have an abundance of exceptional installation guides and training videos in our media hub!

Marketing Offering

Marketing Materials: Branding, Brochures & More!

It’s never been easier to market our products with access to a huge range of high quality marketing materials!

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Exceptional Warranties

Our product warranties cannot be beaten. We are proud to offer market leading aftercare services!

Our Product Range

Opportunities To Join Our Approved Installer Network

Learn about the benefits of being a part of our Approved Installer Network, with the opportunity to be a part of it!

How We Do Business?

Dedicated Field Account Manager

When you start selling Sterfenster, you will have a dedicated Field Account Manager assigned to you!


Over 45 Years Industry Experience

Here at Sternfenster, we have over 45 years of industry experience with no sign of slowing down!