A standard double garage door is 7 ft.
How to install a 9 by 7 garage door.
High by 8 or 9 ft.
The position of the header and back jambs are very important.
The header must be flush on the same plane with back jambs.
Standard single doors are 7 ft.
Door opening height and width headroom from top of opening to ceiling and back room length of garage.
High by 16 ft.
Make sure that the size of the opening matches the size of the door.
For the headroom you should have about 10 to 12 of space depending on the spring system you re installing.
Measure the various areas where the door will be installed.
Garage doors come in standard sizes with most basic roll up single garage doors measuring about 7 feet 2 1 m tall and 9 feet 2 7 m wide.