Cortizo Bifold Doors | Sleek Aluminium Folding Doors

The Cortizo bifold door is a sleek, high-performance aluminium system designed for those who won’t compromise on aesthetics or functionality. Manufactured in-house by our skilled team, this door offers exceptional build quality and smooth operation, making it a top choice for both residential and commercial projects. With its slim profiles and large glass panels, the Cortizo bifold creates seamless indoor-outdoor transitions—ideal for modern homes, architectural builds, and premium extensions.

What sets this system apart is the balance of minimalist design and solid performance. The Cortizo bifold door is engineered for reliability, weather resistance, and thermal efficiency—backed by our decades of experience and expert support. When you choose Direct Trade Windows, you're not just getting a door; you're investing in a complete service built on technical know-how, precision manufacturing, and a commitment to delivering real value.

Key Features:

Ultra-slim aluminium frames for maximum glass and light
In-house manufacturing for consistent quality and lead times
Smooth, effortless folding action with robust hardware
Excellent thermal insulation and weather performance
Flexible configurations to suit modern or traditional designs
Backed by expert advice and aftercare from our trusted team

Whether you’re reimagining a living space or specifying for a client, the Cortizo bifold offers a stylish, high-value solution built to last.

Large folding glass doors providing panoramic views and easy access to the outdoor space.

Cortizo Bifold Plus Door

Elegant Cortizo bifold door opening to outdoor patio and pool area. Modern design enhances natural l.

Technical Specifications
Colours & Finishes

Technical Specifications

Cortizo 6800 bifold door — a thermally broken aluminium bifolding system offering Class 9A watertightness, PAS 24 security certification, and panel configurations from 2 to 14 leaves, engineered for large residential apertures and light commercial openings.

Key Specifications

Thermal Performance: U-values from 1.4 W/m²K (double glazed); 0.97 W/m²K (triple glazed option)
Security: PAS 24 certified — tested on a 2700 × 2530mm, 3-panel configuration
Weather Performance: Air permeability Class 4; watertightness Class 9A; wind resistance Class A3 — tested to BS 6375-1:2009
Frame & Sash Depth: 73mm frame and sash; polyamide thermal break 20mm (frame) / 30mm (sash); 1.8mm profile wall thickness
Max Panel Size: 1200mm wide × 3000mm high; maximum panel weight 120kg
Max Overall Width: Up to 16.8m using maximum panel count with joint pieces
Glazing: 25–45mm units; double or triple glazed; solar control, acoustic, and self-cleaning glass available
Threshold Options: Low threshold (flush/accessible) or rebated threshold (enhanced weather resistance)
Opening Direction: Inward or outward opening; traffic door with conventional handle operation as standard
Finishes: Full RAL powder coat; dual-colour inside/outside; anodised options

The Cortizo 6800 is specified for rear extensions, basement garden-level openings, and contemporary new-build projects where maximum glazed area and verified weather performance are both required. Its Class 9A watertightness rating — the highest available under BS 6375 — makes it suitable for exposed locations where lesser-specified bifold systems frequently fail. DTW supplies and installs the Cortizo 6800 across Surrey, West London, and the Home Counties.

Glass Options

All our Cortizo bifold doors are available with a choice of high-performance glazing to suit your project requirements:

Double-glazed sealed units — standard specification for thermal efficiency
Triple-glazed units — enhanced thermal and acoustic performance
Acoustic laminated glass — for noise reduction in urban and roadside locations
Solar control glass — reduces heat gain and glare while maintaining natural light

We specify the optimal glass configuration for each project based on thermal performance, acoustic requirements and Building Regulations compliance.

Modern Cortizo bifold door with aluminium frame and large glass panels.

Colours & Finishes

Our Cortizo bifold doors are available in three premium finish categories — anodised, matt RAL and textured RAL — with dual-colour options allowing a different finish inside and outside. Woodgrain foil finishes are also available for a natural timber-effect appearance.

Popular RAL Colours

RAL 7016 Anthracite Grey
RAL 9005 Jet Black
RAL 7021 Black Grey
RAL 9010 Pure White
RAL 9001 Cream White
RAL 7012 Basalt Grey
RAL 7022 Umbra Grey
RAL 6009 Fir Green
RAL 8014 Sepia Brown

Any standard RAL colour is available to order. Bifold doors are frequently specified in anthracite grey (RAL 7016) or jet black (RAL 9005), with dual-colour options allowing a contrasting internal finish.

FAQs - Cortizo Bifold Doors

What sets Cortizo bi-fold doors apart from other options on the market?

Cortizo bi-fold doors stand out thanks to their high-quality and innovative design. With up to 14 sashes, a variety of opening types, and an ultra-compact design, Cortizo doors provide a unique blend of functionality and aesthetics.

How will a Cortizo bi-fold door benefit a living space?

The ultra-compact design of Cortizo bi-fold doors minimises the space required when the doors are folded. Each panel has a sightline of just 120mm when folded, maximising living space and creating a seamless transition between indoor and outdoor areas.

What security features are integrated into Corizo bi-fold doors?

Cortizo bi-fold doors come equipped with high-security locking systems, ensuring the safety of any property. With up to 14 sashes, each contributing to the overall security, these doors provide peace of mind.

Can Corizo bi-fold doors be customised?

Yes, we offer a wide range of colour options, allowing you to customise the doors to match you or your customer’s specific design preferences.

How do Cortizo bi-fold doors contribute to energy efficiency?

Cortizo bi-fold doors are engineered to provide maximum energy efficiency. With a u-value of 1.1 W/m²K, these doors effectively insulate living spaces, helping to regulate indoor temperatures and reduce energy consumption.

Other Bifold Doors

Cortizo Bifold Plus

Learn more

Aluminium bi-fold doors for seamless indoor-outdoor living.

Visofold 6000