You need a minimum of 12 feet long, 10 feet wide, and 8 feet high room size for a golf simulator. To have a flexible swing, we recommend 16 feet in length, 12 feet in width, and 9 feet in height. And for the most comfortable swing, 18 feet in length, 15 feet in width, and 10 feet in height is an ideal dimension .
https://www.niftygolf.com/simulators/golf-simulator-room-sizes