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StyleLine uPVC Windows

Quite literally in a class of their own, our StyleLine windows and doors are manufactured using the very latest uPVC technology. The StyleLine range, available exclusively from Sternfenster, introduces uPVC products of the highest quality, featuring an exquisite, seamless finish of the sash and outerframe.

StyleLine Windows

Our StyleLine windows are manufactured using state-of-the-art technology which enables us to produce uPVC products of superior design and quality.

Market-Leading Design

StyleLine Windows

Sternfenster Factory

Sternfenster is the UK’s first fabricator to use the state-of-the-art Seamless Quad Welder from Graf Synergy, which enables us to produce windows and door of superior quality. It allows us to produce a beautiful, seamless finish of the sash and outerframe.


Our StyleLine windows provide you with a consistent, high quality finish throughout. Every uPVC window goes through a stringent manufacturing process in order to provide you with a flawless design and stunning aesthetics.

Exquisite Finish

StyleLine Windows

The impeccable finish is StyleLine’s trade mark, but our exclusive windows and doors are also stronger and more resistant, thanks to a revolutionary welding process that completely eliminates the grooving stage, resulting in no loss of vinyl at the corner joint.

Tough & Durable Outer Frame

StyleLine Windows

Most uPVC windows and doors are currently finished with unattractive grooved corners as a result of the corner cleaning stage. However, with our revolutionary machinery, the excess plastic is actually pushed inside the chambers, making the corner cleaning process completely redundant.

Unique Corner Grooves

StyleLine Windows

Highly secure, each StyleLine window comes with a multi-point shootbolt locking system, with key locking handles as standard. Steel reinforcing, internal beading and incredible weld strength also makes our products innately strong.

Extremely Secure

StyleLine Windows

Features & Benefits

Thanks to higher productivity, we’re also able to offer our StyleLine windows and doors at great trade prices. Take advantage of the uPVC market and position yourself ahead of competition with our unique range of high quality seamless windows and doors. Contact us to find out more.

• Double or triple glazed
• Standard A rated
• Double weather-seals
• Low sightline grey gaskets
• Grey super spacer bar
• Full range of leaded glass
• Feature Georgian bar
• Full range of stains and bevels

• Enhanced weld strength
• Impeccable seamless finish of the corner joint
• High security internal beading
• Multi point shootbolt locking
• Key locking handles
• Steel reinforcing
• Additional security claw locks
• Fab n Fix hardware
• MACO locks

Our StyleLine windows and doors are compliant with the British Standard Kitemark and Secured by Design standards. Following the recommendations from the Association of Chief Police Officers (ACPO), we are able to supply products that comply with the very latest European security standards, including BS7950 and PAS24.