What are the thinnest framed sliding doors available in 2025?
When choosing a new set of aluminium sliding doors, one of the most important visual and functional considerations is the size of the interlock — the vertical profile where sliding door panels meet. A slimmer interlock means a less obstructed view, more natural light, and a sleek, modern appearance.
Glideline GS20 Sliding Door - 20mm Sightline
InfiniGLIDE3 Sliding Door - 20mm Sightline
Architects and homeowners alike often seek ultra-slim profiles that maximise glass area without compromising on structural integrity or thermal performance. But with so many systems available on the market, how do you know which sliding doors St Albans truly offer the slimmest sightlines?
What Is an Interlock Sightline?
The term “interlock sightline” refers to the visible frame where the two sliding panels overlap in the centre. Measured in millimetres (mm), the narrower the sightline, the more ‘frameless’ the appearance. Ultra-slim interlocks typically range from 18mm to 30mm, though some systems still use significantly thicker frames.
Why a Slim Interlock Matters
There are both aesthetic and practical reasons why you might prefer a minimal sightline:
- Uninterrupted Views: Slimmer frames mean more glass and better sightlines.
- Natural Light: More daylight can enter the space, enhancing interior brightness.
- Modern Design: Minimalist frames suit contemporary homes and extensions.
- Increased Property Appeal: Clean lines and wide openings boost resale value.
Of course, interlock thickness is only one factor — performance, thermal insulation, security, and ease of operation are also vital. But for those chasing the slimmest look, this guide focuses purely on the centre mullion width.
Top Slimline Sliding Door Systems Compared
Below is a comprehensive comparison table showing popular aluminium sliding door St Albans systems ordered by the width of their interlock sightlines, from the slimmest to the widest.
| Sliding Door System | Interlock Sightline |
|---|---|
| MFP18 Hyline Sliding Door | 18mm |
| Sunvista Sliding Door | 19mm |
| Sunflex SVG20 Slimline Door | 20mm |
| Edge 2.0 by ID Systems | 20mm |
| Glideline GS20 Sliding Door | 20mm |
| Origin OS-20 Artisan | 20mm |
| Sightline Aluminium Glazing Systems | 20mm |
| Infiniglide 3 Sliding Door | 20mm |
| AluK Infinium Sliding Door | 21mm |
| Minimal Windows Sliding Glass Door | 21mm |
| Maxlight Doors | 21mm |
| System 22 Fineline Aluminium Sliding Door | 22mm |
| Alumen Cor-Vision Plus | 25mm |
| Origin OS-29 Sliding Door | 29mm |
| Sunflex SVG30 Sliding Door | 30mm |
| Schuco ASS70 PD Panorama Design Sliding Door | 30mm |
| Sieger 30 Sliding Door | 30mm |
| Solarlux Cero Sliding Door | 34mm |
| Reynaers Concept Patio 68 (CP 68) | 34mm |
| Reynaers Hi-Finity Sliding Door | 35mm |
| Technal Systems Lumeal Sliding Door | 38mm |
| Artline by SAPA Sliding Door | 38mm |
| Reynaers CP68 Sliding Door | 41.5mm |
| Schuco ASE60 Sliding Door with slim interlock | 40mm |
| Arkay Edgeglide/Cortizo 4200 Sliding Door | 42mm |
| Dutemänn Glide-S | 47mm |
| Cortizo 4700 Sliding Door | 47mm |
| Schuco ASS70.HI DE Sliding Door | 48mm |
| AluK Infinium SC156 Sliding Door | 50mm |
| Reynaers MasterPatio | 50mm |
| SAPA Confort C125 Sliding Door | 50mm |
| Panoglide Sliding Door | 50mm |
| Sunparadise ISO 41 Sliding Door | 51mm |
| SAPA Crown 98 Sliding Door | 51mm |
| SAPA Crown 120mm Sliding Door | 51mm |
| Deceuninck Decalu163 Slide | 73.3mm |
| Origin OS-77 and OS-44 Inline Sliding Doors | 77mm |
| Senior Architectural Ali Slide Door | 79mm |
| Smart Systems Visoglide Plus | 83mm |
| Sunflex SVG83 Sliding Door | 83mm |
| AluK BSC94 Sliding Door | 85mm |
| Schuco ASS48 Sliding Door | 85mm |
| Sieger 85 Sliding Door | 85mm |
| Comar 7P.i LS+ | 88.9mm |
| SAPA C160S Lift Slide Door | 92mm |
| Alumil S-700 | 94mm |
| Schuco ASS 70 HI | 108mm |
| Alutech Systems SL160 | 115mm |
| Comar 7P.1 Sliding Door | 123mm |
What Is the Slimmest Sliding Door on the Market?
The slimmest system in our comparison is the MFP18 Hyline Sliding Door, with an exceptionally minimal 18mm sightline. It’s closely followed by the Sunvista system at 19mm and several top-performing systems at 20mm including the SVG20, Glideline GS20, and Origin OS-20 Artisan.
Are Thinner Sightlines Always Better?
While slimmer is generally more desirable aesthetically, it’s crucial to consider performance and build quality. Ultra-thin frames may require specialist installation and higher-grade materials to meet insulation and structural requirements. Brands like Schuco, Reynaers, and Cortizo are renowned for balancing sightline slimness with robust engineering.
Conclusion
Choosing a slimline sliding doors system is a decision that blends design aspiration with technical precision. If your priority is the slimmest possible interlock, you now have a clear overview of the market options. For the perfect balance of aesthetics, durability, and energy efficiency, consult with an expert installer who can advise on structural support, thresholds, and glass configurations tailored to your project.
Whether you’re upgrading a modern extension, building a new home, or replacing outdated patio doors, the right aluminium sliding door system can transform your space. And in today’s market, the best options offer slim profiles without sacrificing performance or security.
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!