Last year a mobile mechanic in southeast Iowa emailed us about setting up an autolift garage in a new 30×40 pole building with 12-foot sidewalls and a fresh concrete floor. He wanted to do his own maintenance, run restoration and metal work projects, and store one vehicle up top with another parked underneath. That is three different jobs asking for three different machines, and figuring out which single lift covered all of them took a real spec comparison rather than a sales pitch. This is how that project actually went — the model numbers we put side by side, the numbers that mattered, and the choice he landed on. We work out of Ames and install across the state, so this is a build we know well.
Storage-capable four-post models from BendPak and Atlas for home shops, plus Rotary and Challenger for commercial bays. Tell us your ceiling height and we will narrow the list for you.
The Brief: One Building, Three Competing Jobs
The customer laid it out clearly. Passenger vehicles, nothing over about 7,000 lb. Regular maintenance work — oil, brakes, suspension. Restoration and metal work, which means long hours under a car with a welder and a grinder. And storage, stacking one car above another to buy back floor space in a building that was going to fill up fast. He had 12-foot sidewalls, a new slab, and a single overhead door.
Those requirements pull in opposite directions. Maintenance and restoration favor a two-post, because you want the wheels hanging free and the entire underside of the car open with nothing in the way. Storage strongly favors a four-post, because a two-post is not designed or rated for parking a vehicle on it indefinitely, and nothing sits underneath it comfortably anyway. A mid-rise scissor is great for metal work at waist height but useless for storage and awkward for exhaust or driveline jobs. The first honest thing we told him was that no single lift does all three perfectly. The right question for an autolift garage build is which compromise costs you the least on the work you do most often, and for him the answer turned out to be storage plus enough undercar access to live with.
Two-Post Candidates: The Specs We Compared
We still ran the two-post numbers because they deserved a fair look. On the commercial side we compared a Rotary SPO10 class asymmetric unit against a Challenger CL10V3 in the same 10,000 lb range. Both clear the capacity requirement by a wide margin against a 7,000 lb target. Both are clearfloor overhead designs, which means the crossbar sits around 11 feet 8 inches on standard columns — tight but workable under a 12-foot sidewall, though roof pitch and truss depth in a pole building can eat that margin near the center of the span.
Key spec differences came down to arm design and rise. Asymmetric arms with a short front and long rear let car doors open past the columns, which matters enormously when you are climbing in and out of a project car twenty times a day. Maximum rise on both units runs in the 72 to 79 inch range at the lift pads, giving a six-foot person room to stand under a car. Overall width between columns typically sits around 11 to 12 feet, and drive-through clearance is roughly nine feet on a standard model. Where the two-post lost the argument was storage. A hydraulic two-post holds a car on mechanical safety locks fine for a shift, but it is not a parking solution, and you cannot park a second vehicle under a car sitting on arms. That killed it for this autolift garage.
Four-Post Candidates and Where the Numbers Landed
The four-post comparison got more interesting. For a home shop like this we look at BendPak and Atlas storage-capable models in the 8,000 to 9,000 lb range. Capacity was never the constraint — every unit on the list doubled his 7,000 lb requirement. The constraints were rise height, runway length, and footprint inside a 30×40 building.
For stacked storage you need the raised vehicle high enough that a second car fits under it. That means a lift rise somewhere in the 72 to 82 inch range depending on model, and then you add the height of the vehicle on top. Do the math with your actual cars: a 60-inch-tall sedan on a 76-inch rise puts the roof at 136 inches, or about 11 feet 4 inches. Under a 12-foot sidewall that works, barely, and you want a couple inches of margin for the safety lock position. A tall SUV on top does not work. We ran those numbers with his specific vehicles before recommending anything. Runway length in the 15 to 17 foot range covered his cars, and overall width around 8 to 9 feet left aisle space in a 30-foot-wide building. Caster kits were on the list too, since a rolling four-post lets you reposition the whole thing when a restoration project needs the floor.
Restoration and Metal Work: The Access Problem
A four-post has runways, and runways block the exact parts of a car a restorer wants to reach — rocker panels, floor pans, frame rails, and the inner wheel wells. That was the real tradeoff in this build, and we did not gloss over it. The fix is a set of sliding bridge jacks. A rolling jack riding on the runways lifts the wheels free of the platform, which opens up suspension, brakes, and wheel work without leaving the four-post. It does not fully solve rocker panel access, but it covers most of what a restoration project needs on a weekly basis.
The second consideration was drip trays and open-center runways. Open-center designs give better visibility for driveline and exhaust work. Solid runways with drip trays protect the car parked underneath from oil and coolant, which matters a lot if the vehicle up top is a project that leaks. He chose solid runways with trays plus a rolling jack, prioritizing the storage vehicle underneath. We also talked through work lighting, because welding and grinding under a four-post in a pole building with a single row of fixtures is miserable. Adding LED strips under the runways cost very little and made the autolift garage genuinely usable at night, which is when most of his project time actually happens.
Site Verification Before the Order Went In
Before we placed the order we verified the building. The slab was new, which is good and also a caution — concrete needs a full 28-day cure before anchors go in, and four-post lifts have the advantage of being freestanding on many models, requiring anchoring primarily for code and stability rather than structural load transfer. Thickness came in at four inches of 3,000 PSI, which is adequate for this class of unit. We confirmed no radiant heat tubing was buried in the pour, which is worth asking about on every new Iowa pole building because it is increasingly common.
We measured actual clear height at the intended location, not the sidewall spec, because trusses and purlins reduce usable height toward the center. We checked the overhead door track path and the width of the door opening for getting freight in. We looked at the panel — he had 200-amp service with room, and running a dedicated 230V single-phase circuit for the power unit was a straightforward job for a local electrician. We also confirmed the gravel drive could handle a semi with a liftgate, because a four-post arrives as long, heavy runways and columns that nobody is carrying by hand. None of that is glamorous, but skipping it is how an autolift garage project stalls for three weeks.
Cost Tiers and What Actually Drives the Number
We do not quote fixed prices in articles because freight, options, and manufacturer pricing move. But the tiers are worth understanding. A basic home-grade four-post storage lift sits at the entry tier. Adding a rolling bridge jack, drip trays, caster kit, and extended runways can push the package up 30 to 50 percent over the bare unit. Commercial-grade four-posts from Rotary or Challenger sit meaningfully above the home tier and are built for daily production duty rather than weekend use.
Installation is a separate line and depends on distance from Ames, site conditions, and whether we are anchoring into existing concrete or working around obstacles. Electrical is another separate line handled by your electrician. Freight is real money on a four-post because of the runway length. When customers compare an online price against our delivered-and-installed number, they are usually comparing two different things — one includes a crew showing up, setting it level, plumbing and bleeding the hydraulics, cycling it under load, and standing behind it. For this southeast Iowa build the total came in where he expected, largely because we sorted the specs before anything shipped. If you want more background, see our pieces on choosing a four-post lift and ceiling height for home garage lifts.
How It Turned Out and What We Would Tell the Next Buyer
He went with a storage-capable four-post in the 9,000 lb class, solid runways with drip trays, a sliding bridge jack, and a caster kit. Install took a day. He stores a finished car up top, parks a daily driver underneath, and rolls the whole unit toward the wall when a restoration project needs open floor. Two years in, the only service item has been a cable inspection and a hydraulic fluid top-off, which is exactly what we tell every four-post owner to plan for.
The lesson for the next person planning an autolift garage is simple: write down every job you want the building to do, rank them by how often you actually do them, and then compare specs against that ranked list instead of against a price. Capacity is almost never the limiting factor for passenger vehicle work — clear height, runway length, arm geometry, and undercar access are. Measure the real vehicles you own, not the ones you might buy. Ask about the slab before you pour it. And call somebody who installs these for a living before you click order, because a spec sheet does not know your truss depth. We are happy to run through your building on the phone at 800-674-9302 — no charge, and it takes about fifteen minutes.
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