Cortizo GS20 Sliding Door

The GS20 features a 20 mm central sightline, giving one of the slimmest visible profiles in its class and delivering wide, unobstructed views.

The GS20 achieves U‑values around 1.3 W/m²K, aided by its thermally broken aluminium frames and high‑performance glazing, helping reduce heat loss and support year‑round comfort.

Yes, thanks to its multi‑track design and robust aluminium construction, the GS20 supports wide spans and multiple panel configurations while maintaining smooth operation.

Absolutely. With its minimalist profile, high‑performance specification and full customisation, the GS20 is particularly well‑suited to modern, light‑filled homes across Essex and the South East.

Yes. Visit our Essex showroom where you can see the GS20 door in situ, experience its sliding operation, inspect finishes and review configuration options with one of our expert team.

The GS20 uses premium aluminium frames, high‑quality sealing systems and secure hardware to deliver excellent weather resistance and high‑security performance suitable for UK conditions.

Fully bespoke, you can tailor panel sizes, track layouts, finishes, colour options, and handle/hardware styles to match your home and design preferences.

With over 30 years’ experience in aluminium glazing systems, Essex Bi‑Fold offers expert guidance, professional installation and complete aftercare, ensuring your GS20 sliding door performs beautifully for many years to come.