The standard double car garage door is 16' wide x 7' high. A two car garage should typically be a minimum of 20' wide (inside) to allow the doors to open. 22' to 24' width is preferred.
The standard width of a double car garage is 20.5 feet. That is a big enough size to fit a large sedan and a truck inside.
Normal width of a single car garage is 8' feet. Normal width of a double car garage is 16' feet. These answers are for doors typically found in the USA.
The width of a standard single-car garage door is typically 8 to 9 feet wide.
The standard width of a one-car garage door is typically 8 to 9 feet wide.
The standard width of a single car garage door is typically 8 to 9 feet wide.
The average with of an one car garage is 12 feet. Many people will want a few extra feet of width for storage.
20 feet
Typically, a 2 car garage minimum width is 24'. This said, there is no reference to minimum widths for garages in the IRC building code that I can find.
Generally 8' or 9'
a little wider than 2 cars
A standard 2 car garage is 24 ft x 24 ft. So you would double that for a four car garage.
You'll need to get a nonstandard garage door (not single-car width), so that may be very hard to find.