The honest answer: less than most people think, but more than most marketing claims. For a right-handed golfer swinging a driver, you want about 10 feet of ceiling, 12 feet of width, and 16 feet of depth. A one-car garage usually works.
Ceiling height is the one you cannot cheat. Measure your swing arc with a club before you buy anything. If your tallest player clears it with a driver, everything else is solvable.
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