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.
Most garages come in either one or two car models, although larger garages can be built to order. People who want to renovate their garage should consider the room for storage and overhead clearance when measuring for space. Many garage models can be purchased or built as a two-story model, thus doubling the available storage space for the same foot print.