The standard size for one-car garages varies between 12 feet by 20 feet and 14 feet by 22 feet. These units allow space for one vehicle and ample room for storage.
The standard length, or depth, of a garage ranges from 20 to 28 feet or longer. The standard width ranges from 14 to 30 feet. The actual finished length depends on the required amount of extra storage or work space, vehicle sizes and walking room.
Single-car garages are typically a minimum of 12 feet wide and 20 feet deep. Two-car garages are generally a minimum of 18 feet wide and 20 to 24 feet long, depending on the length of the vehicles.
A standard one-car garage measures 16 feet wide by 24 feet deep, and a two-car garage normally measures 24 feet wide by 24 feet deep. These are the outside measurements, so the inside dimensions will be slightly smaller.
A standard two car garage is 24 feet wide by 24 feet long. The size of a garage can be adjusted to the homeowner's needs and can be as small or as large as necessary.
Most garage doors are 8 feet by 7 feet or 9 feet by 7 feet. The size of the doors is dependent on the home and what will be stored in the garage.
A standard one-car garage ranges in size from 12 by 20 feet to 14 by 22 feet, according to Western Construction. The size can go up to 16 by 22 feet on lots that accommodate the extra space.