Custom doors range per home.
Normal garage door height.
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.
If you have an rv the door can go up to 10 feet.
This is for a normal home with a normal car truck suv or van parked inside.
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.
Single garage doors are a height of 7 feet with widths from 8 to 10 feet.
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.
Measure the backroom the distance from the garage door opening to the back wall of the garage.
Well normal garage doors measure 8 x 7 feet 9 x 7 feet and 10 x 7 feet all around.
Then the garage door would be 6 x 6 6.
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.
Double garage doors have a width of 12 to 16 feet.
As for the height it is 7 or 8 feet.
Use a step ladder to more easily measure the ceiling height.
Double car garage doors typically start at 12 feet wide and move.
2 a double door.