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The smallest door I have seen on house building plans is 2'0". The smallest door I have framed for and installed is a 2'4" door. That is the smallest size door I recommend anyone put in. For the handicapped or wheelchair bound the minimum size required is 3'0". sawkerfs
32" is typical.
28 inch is all you can get in that. Any door needs a minimum of 1 1/2 more than the door size.
R.O. is normally 2-2 1/2 inches greater than door size.
Add 2.5 inches each direction to the size of the door. So, a 3 0 x 6 8 would be 38 1/2" x 82 1/2".
The rough opening width for a 24" door is 26-1/2" The rough opening height for a 24" door is 26-5/8" Rough openings are 2" wider and 2-1/2" taller than the actual door. This allows room for the door frame and adjustment.
You are supposed to measure the "rough" opening. This is distance from the studs that line the door opening. (not from the door frame itself) Top to bottom then from side to side. If you already have a door there and are just replacing it then you can just measure the door and get one of the same size. Good luck.
4'1 1/2" by 4' 1 1/2"
The rough opening of an interior door is two inches wider than the width of the door and two inches higher than its height. Thus your rough opening width is 38". A typical interior door has a height of 80" which would require a rough opening height of 82" but check your door to ensure that is theheight.
54" for a standard wheelchair. Wheelchairs will turn in their own wheelbase, but must have room for foot plates and push handles. Electric wheel chairs range mostly from 48" to 72", but there is no actual standard size.
Listed on the driver's door post.
standard height door (80" tall) 2' 6" wide door. Rough opening width is oversized 2"