The typical garage, as defined by most cities and counties in the United States, is 20 ft by 20 ft - for a total of 400 sq.ft. The most common garage door is a single 16 ft wide door centered on one side of the garage. High-end designers generally prefer larger garages and multiple, smaller doors. A common designer 2-car garage size is 26 ft wide by 24 ft deep. Instead of a single large door, such a garage would typically have two 8 ft or 9 ft doors along one of the long elevations.