Garages usually have the height. Basements usually have everything else. Here is how to decide with a tape measure instead of a guess.
The short version
Both rooms have obstructions hanging below the ceiling. The difference is what they cost to remove.
Garage obstructions are usually fixable. Door tracks and opener rails are bolted to the ceiling, and relocating them is a few hundred dollars.
Basement obstructions usually are not. Joists are structural and ductwork is a contractor job. You work around them or you pick a different room.
That single distinction decides most of these. Everything below is how to apply it to your two rooms.
Phase 1: The height test
Do this first. Skip square footage, skip which room is nicer. Take a tape measure to both spaces and measure from the floor to the lowest hanging object directly over where you would swing.
Not the ceiling. The lowest thing above your head.
What the number means
| True clearance | What you get |
|---|---|
| Under 8’6” | Irons and wedges only. Full driver swings hit the ceiling. |
| 8’6” to 9’0” | Works under about 5’10”. Driver feels tight and restricted. |
| 9’0” and up | Comfortable full swings for most golfers. |
Required clearance scales with your height. Rough rule: your height plus 36 inches for a functional swing, plus 48 inches to be genuinely comfortable with a driver. A 5’8” golfer and a 6’3” golfer do not need the same room, which is why the generic “you need nine feet” advice is close to useless.
Measure for the tallest person who will actually use it.
What is hanging in each room
| Garage | Basement | |
|---|---|---|
| Typical ceiling | 8’0” to 10’0” | 7’0” to 9’0” |
| What hangs below it | Door tracks, opener rail, hanging lights | Joists, HVAC trunk lines, plumbing, beams |
| Clearance lost | 6 to 12 in | 8 to 14 in |
| Cost to fix | $500 to $900 for a side-mount opener | $1,500 to $4,000+ for ductwork or structural work |
There is the whole comparison in one row. A garage door opener is a Saturday and a few hundred dollars. Rerouting a main duct is a contractor, a permit conversation, and a number that makes the simulator look cheap by comparison.
The three foot rule
Obstructions only matter where they intersect your swing arc. A duct running along one wall is irrelevant. A duct crossing the centre of the room is fatal.
Stand where you would hit. Swing an alignment stick or a driver slowly. Clear roughly three feet in every direction around your hands and clubhead path. What is inside that envelope is what counts.
Phase 2: Depth decides your launch monitor
Room depth is not just about fitting. It determines which technology you are allowed to buy, and most people find that out after ordering.
Garages typically run 20 to 24 feet deep. Basement rooms are frequently shorter than they look, cut down by stairwells, support columns, mechanical rooms, and walls placed with no thought for a swing arc.
Camera based (photometric)
Sits beside the ball on the hitting mat.
Examples: Foresight GC3 and GCQuad, SkyTrak+, Bushnell Launch Pro, Uneekor EYE XO
Depth needed: 12’6” minimum, 16 ft recommended. Layout: roughly 1 ft behind the golfer, 8 ft ball to screen, 3.5 ft for the screen and frame.
Radar based
Sits 6 to 8 feet directly behind the golfer and tracks the ball down range.
Examples: Garmin Approach R10, FlightScope Mevo+, Rapsodo MLM2PRO, TrackMan
Depth needed: 17’6” minimum, 21 ft or more recommended. Layout: roughly 7 ft from unit to ball, 8 ft ball to screen, 2.5 ft for the screen and frame.
The consequence
If your clear depth is under about 18 feet, you are buying a photometric launch monitor. That is not a limitation, it just narrows your shopping list before you spend, and it saves you returning a $2,000 device.
This is also the most common reason a basement build fails. The room looks fine, the ceiling clears, and then the depth rules out half the market.
We covered the depth math in more detail in the 2-car garage guide.
Phase 3: Everything else
If both rooms clear the height and depth tests, this is where the decision actually gets made. And the basement wins most of it.
| Garage | Basement | Better | |
|---|---|---|---|
| Climate | Unconditioned. Brutal in winter, hot in summer. Needs insulation and a heat source. | Steady 60 to 70 degrees year round with no effort. Needs mild dehumidification. | Basement |
| Ambient light | Windows and door panels wash out the projected image. Needs a brighter projector or blackout. | Dark by default. A cheaper projector produces a better picture. | Basement |
| Noise | Concrete box. Impact noise carries into the house and to neighbours. | Earth and floor insulation absorb it. Noticeably quieter. | Basement |
| Getting gear in | Ground level, wide door. A 10 ft enclosure frame walks straight in. | Tight stairwells and corners. Measure before ordering anything long. | Garage |
| Width | Often 15 to 16 ft, wide enough for a permanent left and right handed setup. | Support columns frequently interrupt the clear span. | Garage |
| Parking | You lose it. Realistically both bays. | Untouched. | Basement |
The climate point deserves emphasis, because it is the one people underestimate. Indoor golf is fundamentally a cold weather activity. A garage that needs a heater to be usable is a garage that needs a heater in exactly the months you want to use it. An uncomfortable room quietly stops getting used, and that is the most expensive failure mode there is.
Phase 4: What it actually costs to make each room work
Neither space is free. Budget these on top of the simulator itself.
Garage
| Item | Cost |
|---|---|
| Side-mount (jackshaft) door opener | $500 to $900 |
| Mini-split heat pump, DIY | $1,200 to $2,200 |
| Mini-split heat pump, professionally installed | $3,000 to $5,000 |
| Blackout blinds or insulation kit | $200 to $600 |
Realistic total: $1,900 to $6,500, depending mostly on whether you install the mini-split yourself and whether the opener is in your way.
Basement
| Item | Cost |
|---|---|
| Dehumidifier, 50 to 70 pint | $250 to $450 |
| Subfloor or rubber gym tiles | $300 to $800 |
| Recessed LED lighting retrofit | $150 to $400 |
Realistic total: $700 to $1,650, assuming the ceiling already works. If it does not, add $1,500 to $4,000 for structural or ductwork changes, at which point the room is usually not worth it.
The pattern holds: garages cost more to make comfortable, basements cost more to make possible.
When neither room works
This is the outcome nobody writes about and it is more common than the articles suggest.
If your true clearance is under 8’6” in both spaces, you are not building a full swing simulator in this house. That is a real answer and it is better to have it now.
What still works:
- A putting and short game setup. Genuinely useful, genuinely fun, and it fits under 8 feet. Most people who build these end up practicing short game more than they expected anyway.
- An irons and wedges bay. If you have 8’6” to your functional minimum, you can build a real simulator and simply not hit driver in it. Plenty of people do this happily.
- A different building. A detached garage, a shed, an outbuilding, or a garage with an unfinished attic above it that could be opened up. Worth measuring before you give up.
What does not work: convincing yourself it will be fine. A driver swung at over 100 miles per hour in a space where the arc meets the ceiling ends in a broken fixture, a hole in the drywall, or a snapped shaft sending a clubhead somewhere unpredictable.
The decision, in order
- Measure true clearance in both rooms. Lowest obstruction, standing where you would hit, three foot radius.
- Measure clear depth in both. Wall to wall, along the direction you would be hitting.
- If one room clears 9 feet and the other is under 8’6”, you are done. That is the common case and it makes the decision for you.
- If both clear the bar, take the basement. Climate, light, and noise are differences you feel every single session. The garage’s height advantage stops mattering once you have enough of it.
- If you are forced into the garage, budget the mini-split first. Before the projector, before the better mat. A room you avoid in January is not a simulator, it is storage.
- If neither clears the bar, see the section above. There are still good options.
Verify it with your own swing
Whatever the numbers say, including the ones on this page, check them yourself.
Stand in the spot in each room. Take a slow full swing with your driver. Have someone watch your clubhead at the top of the backswing and through the finish and tell you how close you came. Then repeat at normal speed, because your arc changes with tempo.
Formulas use averages. Someone with a flat rotational swing needs less clearance than someone steep and upright at exactly the same height. Ten minutes with a tape measure and a driver tells you more than any calculator.
Run both rooms
The Room Size Calculator takes your dimensions, your height, and your intended launch monitor type and tells you plainly which room works and what each would require.
Run both. Thirty seconds each, and the answer is often not the room you assumed.
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