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Essex Bi-Fold

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
GW70 Shaped Window

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. "

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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. "

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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."

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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. "

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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."

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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. "

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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."

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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.

Questions? We’re Here to Help

Find answers about our services - or ask us anything you don’t see.

What makes the Cortizo GW70 Shaped Window different?

It’s a fully bespoke architectural glazing solution that allows you to design unique window shapes without sacrificing energy efficiency or strength.

What shapes can be created?

From gables and triangles to arches and angled units, each window is custom made to suit your home’s design and vision.

Are GW70 Shaped Windows energy efficient?

Yes, the system achieves U-values from 1.0 W/m²K, ensuring compliance with Building Regulations and excellent insulation performance.

Can I choose double or triple glazing?

Absolutely. The GW70 system supports both options, letting you optimise for thermal and acoustic performance.

Are these windows suitable for new builds and existing homes?

Yes, they’re perfect for modern architectural builds as well as replacing older frames in character properties.

How durable are the GW70 Shaped Windows?

Extremely. The aluminium construction and powder-coated finish are designed to resist corrosion, fading, and wear for decades.

What maintenance do they require?

Minimal, a quick clean with a soft cloth and mild detergent keeps them looking like new. 8. What warranty comes with these windows?

What warranty comes with these windows?

Each installation is covered by a 10-year manufacturer warranty and Essex Bi-Fold’s 5-year workmanship guarantee for lasting confidence.

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