GS20 Slimline Sliding Doors Made by Glideline for an Extension in York

 At Glideline, we don’t just manufacture premium sliding doors for the trade. We also support our Approved Installer Network e professionals with products that deliver on site, perform long-term, and make the installation process better from the first day of the installation.

This recent project in York, installed by northern and nationwide trade specialist,  Fenestration Network,  is a perfect example. Two of our GS20 slimline sliding doors, manufactured by us, transform both an existing rear elevation and a new side extension on a detached family home.

The result is a clean, contemporary finish that enhances the property while meeting all the practical demands of the homeowner. More glass, reduced visible frame, and smooth, precision-engineered operation designed for everyday use.

Why Homeowners Choose GS20 over standard Cortizo Sliding Doors

Fenestration Network’s customer selected our GS20 sliding door system for its slim 20mm interlock, contemporary detailing, and suitability for both replacement and new extension openings. Unlike typical trade sliding doors, GS20 comes with enhancements over standard Cortizo Cor-Vision doors:

• 20mm interlock sightlines

• Flush or standard stacking options

• 30mm thick, higher performance safety glass

• Premium-grade aluminium profiles with Qualicoat approved coatings

• High-performance rollers and precision tracks

For installers, GS20 offers the confidence of a well-engineered, installer‑friendly system backed by Glideline’s trade support and technical documentation, with features, specifications and manufacturing enhancements exclusive to Glideline. A better sliding door solution for our trade customers and a noticeable upgrade for the homeowner.

Pre-Installation Coordination and Site Conditions

Our team worked closely with the Fenestration Network surveyors to confirm structural opening sizes, floor levels, and threshold detailing. On this project, brickwork adjustments were needed to accommodate correct widths and heights for both sliding doors. 

We regularly assist with detailed drawings, sample profiles, and technical guidance to support accurate surveys.  This expert help ensures our precision-crafted doors for trade installers are made correctly and checked throughout the manufacturing process. Technical guidance and support is also available to all our installers when required, to assist architects, structural engineers and builders.

Despite challenging conditions, including us delivering during a snowstorm in the North, the GS20 doors were installed cleanly and efficiently. The finished result: high-performance doors with crisp, minimal detailing that elevate the look of the extension and bring far more natural light into the home.

Glideline Sliding Doors. Designed for Performance and Simplicity on Site

For trade customers, one of the standout features of GS20 is how it balances ultra-slim aesthetics with practical installation and long-term usability. The system is designed to be intuitive to fit, robust in handling, and smooth in operation. 

Whilst slimline sliding doors are highly desirable as a patio door product, the overall door design must also be engineered in such a way to resist wind loadings, glass weights and everyday use.  This York home is a typical example of a setting where sliding doors will be used frequently, requiring durable, low-maintenance performance.” 

The GS20 and even slimmer GS15 product are designed to meet current trends for ultra-slim sliding doors whilst also providing dependable security, energy efficiency and weather protection. 

• Rigid and reliable during transport and fitting

• Professionally protected throughout to prevent damage

• Compatible with common threshold detailing

• Smooth and stable during long-term everyday use

• Consistent in finish, sealing, and alignment 

Glideline’s attention to fabrication quality, component and roller upgrades, and glass compatibility make our sliding doors a trusted choice across the UK.

Glideline. Trade Supply of Slimline Sliding Doors Nationwide

As the manufacturer behind the GS20 system, Glideline supplies a growing nationwide network of installers with the products, advice, and service they need to succeed. From supply-only orders to full technical onboarding, we help trade partners deliver the best result for their residential projects.

Fenestration Network are approved GS20 installers nationwide and exemplify the kind of trade relationship we value. Experienced, detail-focused, and committed to the very best service to homeowner customers.

Become a Glideline Trade Partner.

If you’re an installer looking for:

• A reliable manufacturer with full UK production

• A complete range of aluminium sliding, bifolding, casement, and entrance doors

• Expert product advice and installation coordination

• Competitive trade terms and consistent lead times

then talk to us at Glideline. Our entire window and door collection promises you a full suite of aluminium solutions designed for modern, design-conscious homes.

Interested in becoming an approved installer?

Get in touch with our trade team to discuss how Glideline can support your next project.

Project Summary

• System: GS20 Slimline Sliding Doors

• Configuration: Two-panel XX configuration, to rear and side elevations

• Size: 2.0m wide x 2.1m high

• Finish: Anthracite Grey

• Installer: Fenestration Network

• Location: York, North Yorkshire