A garage described only by vehicle count is underspecified. Vehicle length, door width, mirror clearance, turning path, charging, storage, workbenches, lawn equipment, bicycles, refrigerators, and overhead-door tracks all compete for space. A workshop adds material handling, dust, noise, task lighting, compressed air, welding, finishing, or other activity-specific needs.
Draw the major objects at their real dimensions and include the space required to use them. A tool cabinet needs drawer clearance. A vehicle lift needs height, foundation, power, and safe working zones. Sheet goods need a path from delivery to storage and cutting. Doors should support the approach from the driveway rather than only looking centered on the elevation.
Future use should influence structure and utilities. A building may begin as storage and later support a studio, hobby shop, home gym, or vehicle work. Not every future conversion should be fully built today, but conduit, panel capacity, blocking, insulation strategy, plumbing preparation, and clear spans can preserve options at modest cost when planned early.