Add 2 1/2" to each direction.
Rough opening of a 36” utility door
Yes, common yard lumber is suitable for rough carpentry.
A rough frame used to form openings in concrete walls.
$125/sq foot
architect
Make your rough opening 2 1/2 inches larger on the width and height.
sill opening of a wall
Rough opening are 2" wider and 2-2 1/2" taller than than the door itself. 2/8" door needs a 2/10" wide opening.
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.
In most cases rough opening is 38 1/4x82 1/2.
1/2inc all around
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.
For a 30" door, the rough opening would be 32" in width and 82" in height. Check with your local building inspection department just in case a larger door is required.