A garage will need backroom that equals the door height plus 18 inches and possibly more based on the installation of an automatic garage door opener.
Normal garage door height.
Measure the backroom the distance from the garage door opening to the back wall of the garage.
Then the garage door would be 6 x 6 6.
2 a double door.
If you have an rv the door can go up to 10 feet.
Double car garage doors typically start at 12 feet wide and move.
Well normal garage doors measure 8 x 7 feet 9 x 7 feet and 10 x 7 feet all around.
For an approximately 12 x 22 detached garage or one attached to your house the most common width is 8 or 9 feet as for the height it is 7 or 8 feet however in terms of height it can go up to 12 feet to accommodate an rv.
Standard single car garage door widths start at 8 feet for single car garages and move up in 12 inch increments to 10 feet wide.
Rv garage doors are taller with a height of 8 to 9 feet and width of 16.
Double garage doors have a width of 12 to 16 feet.
Custom doors range per home.
You should reconsider the specifications for your garage door if you have multiple vehicles or a large vehicle to park inside.
For a shed the best size for installing a garage door is 8 x 14 feet.
Use a step ladder to more easily measure the ceiling height.
Standard garage door sizes range from single doors to commercial doors.
For a garage attached or detached from your house of around 18 x 24 feet most popular width for a garage door is 16 feet.