This article provides comprehensive information on bypass door sizes, along with step-by-step instructions for measuring the rough opening. With this guidance, each reader can determine the necessary dimensions of the slabs before making a purchase.
Below are tables with the standard heights and widths of sliding doors, which will help you choose the correct size and avoid inaccuracies during installation.
Nominal and actual door height
Nominal and actual door width
Actual door width, inch
Actual slab width, feet
Nominal door width, inch
Nominal slab width, feet
Rough opening width, inch
Rough opening width, feet
Standard sliding bypass door sizes
Typically, the width of sliding bypass doors ranges from 18 to 42 inches, with a maximum standard height of 108 inches; however, the most common height is 80 inches.
The correct slab dimensions for your project depend on the size of your rough opening. If standard sizes do not fit your needs, our specialists can help advise on custom-sized bypass doors.
Bypass doors
- Nominal height: 80, 84, 92 ½, 96, and 108''.
- Nominal width: 18, 24, 28, 30, 32, 36, and 42'' (for one slab).
- Thickness: 1 ¾ and 1 9/16''.
The most popular slabs are 24 × 80, 28 × 80, 32 × 80, and 36 × 96 inches.
The table shows the standard sizes of Belldinni bypass doors.
Height 80
Height 84
Height 92 ½
Height 96
Door size
Rough opening size
36 × 80
34 × 82 ⅜
48 × 80
46 × 82 ⅜
56 × 80
54 × 82 ⅜
60 × 80
58 × 82 ⅜
64 × 80
62 × 82 ⅜
72 × 80
70 × 82 ⅜
84 × 80
80 × 82 ⅜
Door size
Rough opening size
36 × 84
34 × 86 ⅜
48 × 84
46 × 86 ⅜
56 × 84
54 × 86 ⅜
60 × 84
58 × 86 ⅜
64 × 84
62 × 86 ⅜
72 × 84
70 × 86 ⅜
84 × 84
80 × 86 ⅜
Door size
Rough opening size
36 × 92 ½
34 × 94 ⅞
48 × 92 ½
46 × 94 ⅞
56 × 92 ½
54 × 94 ⅞
60 × 92 ½
58 × 94 ⅞
64 × 92 ½
62 × 94 ⅞
72 × 92 ½
70 × 94 ⅞
84 × 92 ½
80 × 94 ⅞
Door size
Rough opening size
36 × 96
34 × 98 ⅜
48 × 96
46 × 98 ⅜
56 × 96
54 × 98 ⅜
60 × 96
58 × 98 ⅜
64 × 96
62 × 98 ⅜
72 × 96
70 × 98 ⅜
84 × 96
80 × 98 ⅜
FAQ
1. How to measure rough opening?
To measure the size of the rough opening before buying and installing bypass doors, you need a tape measure, paper, and a pen or pencil.
Step-by-step instructions:
-
Ensure full access to the doorway by clearing the space around it before measuring (remove furniture and any obstructing decorative elements). Ensure the door opening is level and free of any defects that could affect accuracy.
-
Place a tape measure on the header on the left side of the opening and measure the height to the floor. Repeat the action in the middle and on the right side of the doorway.
-
From the three values, choose the smallest and subtract 2 inches from it to ensure that you can secure a slab that will not mar the flooring when opened and closed.
-
Place a tape measure on the header on the left side of the opening and measure the width to the floor. Repeat the action in the middle and on the right side of the doorway.
-
From the three values, choose the smallest and add 2 ⅜ inches to it.
2. What is the typical rough opening for a bypass door unit?
The recommended dimension of the rough opening for bypass doors is 2 inches narrower than the sum of the widths of the two slabs and 2 ⅜ inches higher.
3. Which formula can I use to size the rough opening or bypass door slab?
Rough opening width = 2 x door width − 2 inches.
Rough opening height = door height + 2 ⅜ inches.
Example:
If your rough opening is 62'' wide and 86 ⅜'' high, then the calculations to determine the slab size will be as follows:
-
Door width (for one slab) = (rough opening width + 2 inches) ÷ 2. Thus, (62'' + 2'') ÷ 2 = 32''.
-
Door height = rough opening height − 2 ⅜ inches. Thus, 86 ⅜'' − 2 ⅜'' = 84''.
As a result, the required size of one bypass door slab is 32 × 84 "or the entire door unit with two slabs is 64 × 84".