Standard garage doors in our area are 8 9 16 and 18 wide.
Pole barn garage door rough opening.
Frame the rough opening to 3 inches wider than the garage door size you have selected.
If you are installing a 9 wide door the opening will be 9 3 wide.
Frame the rough opening to a height that is 1 5 taller than the door that you have selected.
1 2 or 1 in one direction of the other will won t typically cause you to have to shop for a non standard garage door size.
The rough opening is equal to the size of the door but you need to figure back head and side room before choosing and installing the new garage door.
99 of the residential garage doors that we run across are different than these widths.
The height of the rough opening would be the height of the garage door plus the thickness of whatever you are putting underneath the header in addition to the thickness of the mortar etc.