Just add 2 to the width of the actual door size.
Interior door opening height.
Standard interior door height is 80 inches.
Framing rough opening sizes are really quite simple.
The minimum recommended door width to allow persons with disabilities to pass through is 36 inches.
For a pre hung door measure the width and height of the slab the rough opening space between the studs with no door installed and the thickness of the jamb.
As a home improvement contractor the majority of doors i replace are standard interior size doors.
The height for all passage doors must be a minimum of 80 inches and the standard width sizes for interior doors are 24 28 30 32 and 36.
For a slab door measure the width height and thickness of the door.
Although custom doors do cost more money.
Standard widths for interior doors are 24 28 30 32 and 36 inches while the height must be a minimum of 80 inches.
This will give you room to space the door frame off of the sub floor.
Custom doors can be made to match any size door opening.
This is the most common height for passage doors that lead from one room to another.
Getting the rough opening size right the first time will save you from frustration when installing your doors.
On average you can expect to pay roughly 20 25 percent more for a custom door.
You should add 2 1 2 to the height of the actual door.
The standard height of the rough opening for a door is the door height plus 2 5 8 inches.