A hitting net stops a golf ball, and nothing else; an enclosure kit stops the ball, the follow-through on a shanked iron, and the slap of loose fabric that sounds like a gunshot in a two-car garage. That gap is the entire reason my DIY golf build went from a net-and-a-mat setup to an actual simulator enclosure, and it's the question neighbors ask most once they find out what's happening behind my garage door on weeknights.
A Net Alone Almost Went Through the Wall
Before the enclosure, my setup was a loose net from a big-box store bungee-corded to a couple of eye hooks, standing in front of a mat that slid three inches every time I took a real divot. It held up for about a week. Then a thinned 7-iron caught the edge of the net and the ball skipped past it toward the back wall, close enough that I heard it hit something solid before I saw where it landed. Heart rate through the roof.
That was the moment the math changed. I'd already been through a launch monitor swap by then -- a Garmin Approach R10 that went back after two weeks because the indoor shot data kept drifting every time the garage light dropped in the evening, which is most evenings once the sun's down before I get home. I landed on a SkyTrak setup instead, and a reader named Chadwick Obiero emailed me not long after a piece comparing the two -- he wanted to know what I'd actually buy today if starting from zero, and he's the type who sends a photo of the receipt about two weeks after you answer him.
A loose DIY net doesn't have the tension or the depth to make that kind of shot boring instead of dangerous, and a boring shot is exactly the goal once you're rebuilding a swing after a knee surgery and can't always predict where the club face is going to be at impact. Enclosure kits solve for depth first -- mine needed at least five feet of clearance between the hitting position and the back wall before the frame and the screen ever went up (my wife had already banned new purchases until December 2026 by that point, so this one had to count).
Enclosure Kit vs. Open Bay: What Actually Changes
An open bay is just a hitting area with a net or a screen hung loosely somewhere behind it -- no frame, no real tension, nothing stopping a bad miss from finding the drywall. An enclosure kit is a built frame with the screen and side netting tensioned to it under real pressure, which is the part nobody explains well in marketing copy. That tension is what turns the terrifying slap of a ball hitting loose fabric into a deep thwack, and it's also what keeps the whole structure from walking across the floor after a dozen full swings.
Wes from across the street was openly skeptical about the whole project right up until he stepped into the bay and hit his first drive off the mat -- he's asked about ceiling clearance every time he's been back since, which tells you something about how fast the skepticism wears off once you're standing inside the frame instead of looking at it from the driveway. An open bay never converts anybody; it just looks like sporting goods stacked in a garage. A finished enclosure looks like a room built for one specific job, and that visual difference matters more for buy-in from a skeptical spouse or neighbor than any spec sheet does.
Picking a Packaged Kit Over a DIY Build
Sourcing a frame, a screen, and side netting separately from three different sellers sounded like a good way to save money until I actually priced it out and realized the compatibility problems would eat the savings. I ended up going with the SIG line from The Indoor Golf Shop instead, mostly because the frame and the screen are engineered together as one system rather than a bag of pipes and a tarp you're expected to figure out yourself.
Shipping a SIG12 is a freight event, not a box on the porch -- budget a helper and roughly half a Saturday to get the frame leveled and the side curtains pulled taut. Leveling that frame on a poured concrete slab is its own fussy project I'm not going to turn into a full guide here, but plan on it taking longer than the instructions suggest. The mat that ships in some of these bundles is a separate rabbit hole too -- what a surface does to your knees and elbows over a two-hour session is worth its own writeup, and this isn't it.
None of that matters if the kit doesn't actually fit your garage in the first place. You still need to check your own space requirements for a full swing before you order anything, because the floor footprint fitting a two-car bay doesn't mean your driver's follow-through fits the room above it. I measured my own garage three times and my driver's follow-through still came within what felt like inches of the side wall on the first test swing. Close enough to feel it in my stomach. I've kept a wider margin on that side of the bay ever since.
Does the Screen Matter More Than the Room Around It?
Spending extra on a premium impact screen is a waste if the room around it is fighting the picture -- screen durability and how different weaves hold up over thousands of shots is a topic I'll leave for another post, because ambient light is the bigger variable most people ignore first. Standard shop lighting or a window without a blackout blind will wash out even an expensive screen, and I've covered the fix for that separately -- choosing the right lighting made a bigger difference in image quality than any screen upgrade did in my own setup.
Containing the stray ones is a separate question from image quality entirely -- how much net or side coverage a shank that goes sideways instead of long actually needs is its own conversation, and the enclosure's side panels handle it differently than a standalone net would. For my purposes the screen just needed to stop looking washed out, and once the lighting was sorted, the SIGPRO screen went back to sounding like a heavy drum instead of a bedsheet.
The Week the Numbers Started Matching the Course
A launch monitor reporting carry, spin, and launch angle accurately is a whole separate conversation from the enclosure itself -- which numbers actually matter for a mid-handicap game is worth its own breakdown -- but none of it means anything if the room around the screen is unsafe or the mat throws off your stance. Six weeks into regular Tuesday and Thursday sessions inside the finished enclosure, my 7-iron carry started settling on 156 yards on the screen, which happens to be the exact number printed on the scorecard at Lunken Airport Golf Course in the East End for the hole that's given me more trouble than any other in Cincinnati.
Software load times between sessions still leave me standing around more than I'd like, so I usually end up rolling a few putts across the mat with a SWAG Golf Handsome Too putter toward a projected hole while the course resets -- it's a nice piece of gear for what amounts to killing ninety seconds, and the face milling feels better than a garage practice session probably deserves.
Enclosure Kit or Open Bay for Your Garage?
Open bay setups are fine if you're chipping into a net a few times a month and don't mind the occasional near-miss toward something you'd rather not replace. An enclosure kit earns its space once you're actually logging sessions twice a week, because the depth, the tension, and the contained frame are what let you swing full speed without flinching at every mis-hit. That's worth more than the sound difference or the screen upgrade, even though those get all the attention in the marketing.
The lesson that stuck with me from the whole build wasn't really about golf at all -- it's that safety-adjacent gear is the wrong place to buy cheap and upgrade later, because the upgrade usually happens right after something nearly goes through a wall. Everything else, the screen brand, the mat, the putter I fiddle with while software loads, is a preference. The enclosure depth and the frame tension aren't.
If you're weighing a kit against pricing one out from The Indoor Golf Shop, measure your ceiling and your side-wall clearance before anything else -- no amount of screen tension fixes a driver that clips something on the follow-through. Whether it's worth crossing into $3,000-plus territory comes down to how often you'll actually use it once the novelty wears off, and mine gets used twice a week, which is the number that actually justified the $3,000.