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.
Three-car garages are typically 30 feet wide. Standard dimensions also exist for garages that are sized for 2.5 and 3.5 cars. Homeowners who desire ample storage for other items and walking space may opt for larger dimensions. For example, if the third vehicle is a boat, the homeowner may want a 3.5 car garage, which is typically sized at 26 by 32 feet.
Properly planning the size of the garage involves considering the number of vehicles and the amount of space needed for storage, walking and other uses.