Slimline Bifold Doors: More Glass, Less Frame

2 February 2026 | Doors

Looking for slimline bifold doors that maximize natural light? Cortizo’s Research and Development team have released a game-changing innovation: a revolutionary bifold door system that reduces industry-standard sightlines from 120mm to just 100mm. This 17% reduction in visible frame might sound modest, but the impact is transformative.

Why Slimline Bifold Doors Matter

Sightlines are the visible width of the frame between you and your view. Across a typical three or four-panel installation, reducing this by 20mm translates to significantly more glass area. The result? More natural light flooding your home, uninterrupted garden views, and a sleeker aesthetic that makes walls seem to disappear.

Engineering Excellence in Slimline Bifolds

Achieving slimmer frames without sacrificing performance required serious innovation. Cortizo’s advanced extrusion techniques and optimized profile geometry create frames that are both slimmer and remarkably robust.

The slimline profile maintains everything you’d expect from premium bifolds: excellent weather resistance, superior thermal efficiency through advanced polyamide thermal breaks, and structural capacity to support large glass panels safely. Multiple weather seals achieve impressive performance even in exposed locations.

Style That Works Everywhere

The near-frameless appearance suits contemporary new builds perfectly, where clean lines define the aesthetic. But these slimline bifold doors shine in period properties too, creating elegant contrast without overwhelming traditional features.

The reduced frame weight means effortless gliding operation, while maintenance stays minimal—just occasional cleaning and lubrication.

Key Benefits of Slimline Bifold Doors

Design Innovation:

• Industry-leading 100mm sightlines versus 120mm standard
• 17% more glass area for maximum natural light
• Ultra-contemporary aesthetic with minimal frame
• Works with modern and traditional architecture

Performance Features:

• Advanced thermal breaks maintain energy efficiency
• Robust engineering ensures structural integrity
• Superior weather seals and smooth operation
• Multiple powder-coated colour finishes

Practical Value:

• Minimal maintenance requirements
• Decades of reliable service
• Increased property value
• Future-proof design

• Complete Customisation Options

  Choose from two to seven panels with flexible opening configurations. The slimline aesthetic works across all sizes, from compact extensions to grand six-meter installations. Low-profile thresholds create seamless transitions, while raised options suit exposed positions.

  Why Choose Direct Trade Windows for Slimline Bifold Doors

  At Direct Trade Windows, we’re excited to offer this genuine innovation in bifold door technology. Our teams are trained specifically on these slimline profiles, ensuring precision installation that delivers flawless operation for years to come.

  The Bottom Line

  Cortizo’s slimline bifold doors aren’t just another product update—they represent a meaningful leap forward. If you’re planning an extension, renovation, or upgrade, these doors offer something genuinely new: 17% more glass, contemporary aesthetics, and proven performance.

  The future of bifold doors is slimmer, sleeker, and more sophisticated. Contact Direct Trade Windows today to discuss how slimline bifold doors can transform your home.