What are the thinnest Bi Fold doors available in 2025?
When it comes to choosing bifold doors, one of the most important design features to consider is the sightline. A slimmer sightline not only enhances the aesthetic appeal of your doors but also maximises natural light and offers a more seamless connection between indoor and outdoor spaces. For homeowners, architects, and designers seeking the most minimal and modern look, choosing a bifold system with ultra-slim sightlines is key.
This article explores the slimmest bifold doors available on the market today, ranked by their sightline width. We’ll highlight some of the most reputable brands and models that prioritise both style and functionality.
Siegur Lux Bifold Door - 74mm Sightline
Unifold Bi-Fold Door - 120mm Sightline
Why Sightlines Matter in Bifold Doors
Sightlines refer to the visible width of the frame where two door panels meet. The slimmer the sightline, the more glass and less frame you see. This not only improves the view but also creates a cleaner, more contemporary look. Slim bifold doors st albans are ideal for modern homes, extensions, and garden rooms where maximising light is a priority.
What Is the Slimmest Bifold Door on the Market?
According to the latest industry data, the Sieger Lux by IQ Glass currently offers the slimmest bifold sightline available at just 74mm. This ultra-minimalist aluminium door system is a favourite among premium property developers and luxury architects.
Comparison of Slimline Bifold Door Systems by Sightline
Below is a comprehensive comparison of various bifold door systems sorted by sightline. The slimmer the sightline, the more seamless your glass wall will appear when the doors are closed.
| Bifold Door Name | Sightline |
|---|---|
| Sieger Lux by IQ Glass | 74mm |
| Origin OB-36+ Soho and Origin OB-36 Contemporary | 84mm |
| Alumil Smartia MF65 | 88mm |
| Express Bifolds XP88 | 88mm |
| Schuco ASFD75 | 90mm |
| Smart Systems Visofold 6000 | 94mm |
| Aluco Aluminium steel-look bifold | 94mm |
| Solarlux Ecoline and Highline | 99mm |
| Solarlux SL80 | 105mm |
| Alumil SF85 | 105mm |
| Express Bifolds XP Vision (Alumil SF85) | 105mm |
| aïr 900 bifold door | 107mm |
| Glideline GB49 | 110mm |
| Cortizo Bifold Plus | 110mm |
| Origin OB-49 Bifolding Door | 110mm |
| Greenways Ultra Slim Bifolding Door | 110mm |
| Schuco ASS 80FD | 112mm |
| Sunflex SF75 | 115mm |
| Stellar Aluminium Systems Bifolding Door | 117mm |
| Comar FSDX Folding Sliding Door | 120mm |
| Schuco ASS 70 FD | 120mm |
| Cortizo Bifolding Door | 120mm |
| Unifold by Arkay Windows | 120mm |
| StudioGlide by Eurocell (DeWall product) | 120mm |
| Deceuninck Decalu88 folding doors | 120mm |
| Air 800 Bifolding Door | 122mm |
| AluK Luminia F82 Bifold Door | 122mm |
| Smart Systems Visofold 1000 Slim | 122mm |
| Reynaers CF 77 SL | 122mm |
| Senior Architectural Alifold Doors | 123mm |
| Senior Architectural PUReFold Doors | 123mm |
| Sunparadise Supertherm 80 Bifolding Door | 124mm |
| Sunparadise Thermo 60 Bifolding Door | 124mm |
| Stayfix Architectural Vision Fold Doors | 125mm |
| Folding Sliding Door Company FD72 | 130mm |
| Velfac 860 Bifolding Door | 130mm |
| Reynaers CF68 | 131mm |
| SAPA Crown Folding Door with slim sash | 131mm |
| Smart Systems Visofold 1000 | 132mm |
| Korniche Bifold Doors by Made for Trade | 133mm |
| Exlabesa Xlafold Bifolding Door | 135mm |
| Centor C1 Bifolding Door | 136mm |
| Sheerline Prestige Bifold Door | 138mm |
| AluK Optio BSF70 Folding Sliding Door | 140mm |
| Sieger Bifolding Door | 140mm |
| Smart Systems Visofold 2000 | 141mm |
| Metal Technology Bifolding Door | 143mm |
| Technal Ambial Bifolding Door | 143mm |
| Reynaers CF77 | 144mm |
| Panoramic Slide and Turn Door | 145mm |
| Kawneer AA3720 Bifolding Door | 145mm |
| Stellar Aluminium Systems Bifolding Door | 146mm |
| Kestrel Folding Sliding Door | 150mm |
| Metal Technology System 26 HI+ Bifolding Door | 153mm |
| Origin OB-72 Bifolding Door | 154mm |
| Smart Systems Visofold 3000 | 154mm |
| Alumina by Liniar | 156mm |
| Warmcore Bifolding Doors | 156mm |
| Solarlux SL70 | 157mm |
| SAPA Crown Folding Door standard sash | 165mm |
| Aluprof MB System Bifolding Door | 166mm |
| Smart Systems Visofold 4000 | 185mm |
Final Thoughts
If your project demands a sleek, minimal aesthetic, selecting a bifold door with the slimmest sightline is essential. The Sieger Lux by IQ Glass leads the field, followed closely by models from Origin, Alumil, and Schuco. Remember, while sightline is a key design factor, other elements such as thermal performance, hardware quality, and finish options should also be considered before making your final decision.
Always consult with a specialist installer to determine which system best suits your property and performance requirements.
Great post! Glazing is such an important aspect of both aesthetics and energy efficiency in modern buildings. It’s amazing how the right glass choices can completely transform a space while also improving insulation and reducing noise. Thanks for sharing!