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.
2 a double door.
Custom doors range per home.
If you have an rv the door can go up to 10 feet.
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.
Use a step ladder to more easily measure the ceiling height.
Standard garage door sizes range from single doors to commercial doors.
As for the height it is 7 or 8 feet.
Double car garage doors typically start at 12 feet wide and move.
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.
Single garage doors are a height of 7 feet with widths from 8 to 10 feet.
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.
Then the garage door would be 6 x 6 6.
Well normal garage doors measure 8 x 7 feet 9 x 7 feet and 10 x 7 feet all around.
For a shed the best size for installing a garage door is 8 x 14 feet.
You should reconsider the specifications for your garage door if you have multiple vehicles or a large vehicle to park inside.