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There aren't any standard dimensions for a 1.5 car garage, but a one-car garage is less than 300 square feet. A two-car garage is usually just over 600 square feet, so a 1.5 car garage would be somewhere in between the two measurements.
8 or 9 foot, either one is common.
A two car garage is usally 24 feet X 24 Feet.
A standard 2 car garage is 24 ft x 24 ft. So you would double that for a four car garage.
Windows differ in height and style by make and model, but the average car window height is19.5-inches. Standard window heights on vans and SUV's have a standard height of 21.9-inches.
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.
Big enough to close the door.
12 x 40
You'll need to get a nonstandard garage door (not single-car width), so that may be very hard to find.
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 average length would be 24' but bigger is always better.