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Door Hinging & Rough Opening Information
Left-hand vs Right-hand Doors
When ordering or selling doors, it is important that you help your customer purchase the proper hinging. The hinging on interior and exterior doors is determined as you pull the door toward you, whatever side the knob is on. For example, when the door opens to you and the knob is on the left, it is a LEFT HAND DOOR. When the knob is on the right, it is a RIGHT HAND DOOR.
Figuring a Rough Opening Interior
Door Size | Meas. Size | R/O Size |
---|---|---|
*1/0 | 12″ W | 14 1/2 x 82″ |
*1/4 | 16″ W | 18 1/2 x 82″ |
*1/6 | 18″ W | 20 1/2 x 82″ |
*1/8 | 20″ W | 22 1/2 x 82″ |
*2/0 | 24″ W | 26 1/2 x 82″ |
*2/4 | 28″ W | 30 1/2 x 82″ |
*2/6 | 30″ W | 32 1/2 x 82″ |
*2/8 | 32″ W | 34 1/2 x 82″ |
*3/0 | 36″ W | 38 1/2 x 82″ |
* All R/Os figured as 6/8 doors(80″)
Rules of thumb:
For interior doors, add 2 1/2″ to the width and 2″ to the height of the door measurement.
For exterior doors, add 2 1/2″ to the width and 2 1/2″ to the height of the door measurement.






