Need rough gap size for 9'x7' overhead garage doors? ...

Trying to clash Canadian electrics next to American...
Answers:    9'3" wide for the distance and 7' 11/2" for the height. This would allow you to frame and wrap and apply the door stamp around the outside of the door after it is installed with 2" x 4 or 6" boards.

Hope this help you. Some may do it a little different - but this have worked for me
How do you replace a bedroom door?
See link below...
:)