If you are planning a new closet, a room divider, or a wide opening between your living space and the outdoors, bypass sliding door systems are one of the most practical options you can choose. Instead of swinging into the room, their panels glide on parallel tracks and slide past one another, which means they take up almost no floor space. But before you order, you need to get the sizes right. This guide walks through standard sliding door sizes, how to measure your opening, and what to look for when ordering custom aluminum bypass sliding doors.
A bypass sliding door uses two or more panels that run on separate tracks, so each panel slides in front of or behind the others. When you open it, the panels overlap instead of folding or swinging away. That makes it an ideal choice for tight spaces, long closets, laundry rooms, and wide patio openings where a swing door would get in the way.
There is no single universal size, but most manufacturers work from a set of common dimensions. For interior closet and wardrobe applications, the typical sizes are:
| Application | Opening Width | Panels | Common Panel Size |
|---|---|---|---|
| Interior closet | 48" (4') | 2 | 24" x 80" |
| Interior closet | 60" (5') | 2 | 30" x 80" |
| Interior closet | 72" (6') | 2 | 36" x 80" |
| Interior closet | 96" (8') | 3-4 | 24"-32" x 80" |
| Exterior patio | 60" (5') | 2 | 30" x 80" |
| Exterior patio | 72" (6') | 2 | 36" x 80" |
| Exterior patio | 96" (8') | 2-3 | 32"-48" x 80" |
| Large opening | 108"-144" (9'-12') | 3-4 | Custom |
For exterior bypass sliding doors, heights usually run from 80" to 96". Many homeowners now choose taller panels for a more open, panoramic look. If your opening is bigger than these standard sizes, or if you want a specific finish, a custom bypass sliding door is the way to go.
For example, a 72" wide, 80" tall opening works well with two 36" panels. Always double-check the manufacturer's installation guide, because track systems differ and a small measurement error can cause the panels to bind or leave gaps.
Exterior bypass sliding doors are a different story. They have to handle weather, wind, and daily use, so the frame, track, and glass are built heavier than interior versions. That is why most exterior sliding doors are aluminum systems with thermal break profiles. The size limits depend on the system's load capacity and wind resistance, not just the opening.
For example, ALPES SL155 thermal break sliding doors use 6060-T66 aluminum profiles with a 2.2-2.5mm main load-bearing thickness and a 20-wheel self-balancing pulley system rated for 400kg. A single sash can reach 2800mm wide by 2600mm high, giving an opening area of up to 7.5㎡. The SL126/182 series goes even larger, with single sashes up to 2.5m by 3.0m and a daylight area of around 7㎡.
What this means in practice: if you need a wide opening with large glass panels, choose a system built for it. A lightweight interior bypass door will not hold up outdoors, and an undersized exterior door will struggle with wind load and sealing.
Standard sizes cover most projects, but custom doors make sense when your opening is non-standard, you want a specific color or finish, or you are matching existing architectural details. ALPES offers custom aluminum bypass sliding doors in a range of colors including Ice Cream White, Aurora Gray, Starry Sky Gray, and Brown Coffee, with custom color matching available on request.
The quality of a bypass sliding door depends on the profiles, hardware, and sealing as much as the size. Look for a supplier that uses 6060-T66 aluminum profiles, PA66GF25 thermal break strips, and hardware from established brands. ALPES, a China-based aluminum windows and doors manufacturer, builds its sliding doors with German hardware partners such as ROTO, Winkhaus, CMECH, and Wehag, and manufactures to international building codes in a 100,000㎡ facility. If you are sourcing for a project, working directly with a factory means better pricing and fully custom sizes.
What is the standard size of a bypass sliding door?
For interior closets, common sliding door sizes are 48", 60", and 72" wide by 80" tall. Exterior bypass sliding doors typically start at 60" wide and go up to 144" or more with multiple panels.
How do I measure for a bypass sliding door?
Measure the width and height of the opening, subtract about 1 inch from the height for the track, and make each panel roughly half the total width for a two-panel door.
Can I get custom bypass sliding door sizes?
Yes. Most manufacturers, including ALPES, offer fully custom sizes for non-standard openings.
Are bypass sliding doors good for exterior use?
Yes, when built as an aluminum thermal break system with proper load capacity and sealing. Standard interior bypass doors are not suitable for outdoor openings.
Bypass sliding doors save space and look clean, but the right size is what makes them work. Start with the standard sizes, measure your opening carefully, and if your project needs something bigger or more custom, choose a supplier that builds to your dimensions. For quality aluminum bypass sliding doors in custom sizes, ALPES is a reliable choice with factory-direct pricing.
