Cortizo Shaped GW70 Aluminium Window

The Cortizo GW70 Shaped Window is designed to bring light, character, and architectural impact to any property. Crafted from premium aluminium and based on the trusted GW70 system, it combines striking style with outstanding performance. Whether used for gables, vaulted ceilings, or shaped corner glazing, it allows for creative expression without compromise on insulation or strength.

Featuring slim profiles and deep thermal breaks, the system achieves U-values from just 1.0 W/m²K with double or triple glazing, meeting Building Regulations with ease. Perfect for feature façades, contemporary extensions, or traditional homes seeking a statement finish, the GW70 delivers elegance, energy efficiency, and long-lasting durability in equal measure.

Key Benefits

Available in bespoke architectural shapes - including gables, triangles, arches, and angled windows
Built on the proven GW70 system for strength, energy efficiency, and design consistency
Double or triple glazed, with U-values from 1.0 W/m²K, suitable for all building types
Slim aluminium frames maximise glass area and natural light for a bright, open feel
Deep thermal breaks ensure superior insulation and year-round comfort
Ideal for vaulted ceilings, apex glazing, and unique design features in new builds or renovations
Durable, low-maintenance powder-coated aluminium, engineered to perform for decades

Why Choose Essex Bi-Fold?

30 years Experience

Over 30 years of experience and 2,500+ successful installations across Essex and the South East

Origin Premium Partner

Recognised Origin Premium Partner – trusted for excellence in installation and service.

Extensive range

Extensive window range: bi-fold, casement, gable, picture, French, and bay styles to suit any property.

Essex Showroom

Dedicated Essex showroom where you can view and test our full range of aluminium windows

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Jeanette White

"The Bi-fold doors are amazing. The showroom has a few full set-ups which allowed me to have a good look and try it out before deciding. "

Raymond Law

"We visited Essex Bi-Fold doors and met with Clive and were impressed with there showroom and expertise. The doors we ordered look great, and the quality is excellent. "

Lester Wadden

"Essex Bi-fold Replaced our two old Kitchen roof windows with new Korniche roof lanterns. The whole experience, from initial enquiry to completion of installation, was excellent. The design of the new windows is so much more efficient, allowing more light into the kitchen."

Vicky Knight

"Wonderful experience from start to finish. We purchased Origin Bi-folds from Essex Bi-Folds August 2025. Easy to purchase, great showroom with lots of options, good price, amazing quality. "

The Bootlegger

"Great service and communication. OS-29 sliding door went in without issues. We’re really glad we found Essex Bi Fold as they’ve been on point. Loving the door quality and look. Feels very strong, door glides open with ease. 10/10."

Karen Scarsbrook

"Highly recommend this company. Everyone we dealt with from Lee in the office, his manager and the installers were extremely nice and super helpful - going the extra mile to get the finish we desired. "

Paul Marsh

"Absolutely fantastic team Clive Lee and the guys couldn't do enough for you. The difference its made to our lives is insurmountable."

Recent Projects

Real projects, real results - crafted with precision and care

Explore our latest projects featuring bi-fold doors, sliding doors, entrance doors, and windows - transforming homes with light, space, and modern design, all crafted with precision and care.

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