A 2 post car lift install goes well or goes badly based on what happens before the crate hits the shop floor. We worked with a third-generation family garage in Davenport last October, walking their site survey and prep sequence a full four weeks before install day. The result was a six-hour install with zero surprises. This article is the practical prep checklist we ran with them — measurements, drawings, electrical, air, concrete, and the small logistics details that make an install day boring in the best sense of the word. If your shop is preparing for a lift, this is the sequence to run before we roll the truck.
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Site survey step one: measurements that actually matter
Before we quote a specific 2 post car lift model we need eight measurements from the bay. Ceiling clearance at the highest point (typically the truss or joist bottom, not the drywall). Ceiling clearance at the lowest point (any HVAC duct, light fixture, or beam). Bay width at the drive-thru location. Bay depth (front-to-back available slab). Garage door opening height and width if the vehicle enters through a door. Distance from the planned column footprint to any wall, joint, or crack in the slab. Slab thickness. Slab age and pour date if known.
The Davenport shop had a fifteen-foot ceiling at the truss bottom, a thirteen-foot HVAC duct running north-south along their drive lane (which we routed around), a twenty-two-foot bay width with plenty of column-spacing headroom, and a ten-foot garage door opening. That let us spec a clearfloor overhead machine without any issue. If their ceiling had been under twelve feet or their door opening under nine-and-a-half, we would have gone baseplate. Measurements are five minutes of work. Getting them wrong means the crate does not fit under the door. We do not order until we have them in writing.
Slab check: what to core, what to scan, what to trust
Their slab had been poured in 2004 during a shop expansion. They had records: five inches of 3,500 PSI concrete with number-four rebar on eighteen-inch centers. That is textbook for a 2 post car lift install. But records or not, we always scan on-site before drilling. On the day of site survey we took a rebar scanner across the planned column footprints and confirmed bar spacing, direction, and depth. Everything matched the records.
When records do not exist — which is common for older shops or leased bays — we core the slab. Coring is a two-inch-diameter test hole in an inconspicuous location; we pull the core, measure thickness, note reinforcement (if the core catches a bar), and check aggregate size and cure quality. Coring costs under two hundred dollars and it is the honest way to know what your slab actually is. Never guess. The number of shops that told us the slab is fine and then turned out to have three-inch pours over gravel is not small. Verify. Every 2 post car lift install we do starts with either records-plus-scan or a fresh core.
Electrical: power, panel, and code compliance
A single-phase 2 post car lift needs 220V on a fifty-amp breaker, typically fed through a NEMA 6-50 receptacle within ten feet of the power unit. Three-phase machines are a different animal — they need 208V or 480V three-phase from your service panel, and if you do not already have three-phase in the building, you probably want single-phase and be done with it. Most shops running a 2 post car lift for tire rotation and general service are on single-phase.
Davenport had a subpanel in their bay with plenty of headroom. We added a new fifty-amp breaker and a run of number-six wire to a wall-mounted 6-50 receptacle at the passenger column. Their local electrician did the work under permit; total electrical cost around six hundred dollars. If your bay does not already have a 220V circuit, this is a step to schedule at least two weeks before install day — permits take time and inspection windows are not always same-week. Skipping the permit is a bad idea; if you ever sell or lease the building, unpermitted electrical shows up on inspection and becomes a delay.
Air, lighting, and workflow surround
Compressed air is not required for a 2 post car lift to operate, but every shop uses air tools around the lifted vehicle: impact wrenches, blow guns, air ratchets. Where the air lines drop matters. Ideally you want a coiled hose reel or a hard-piped drop within six feet of the driver-side arm and another within six feet of the passenger-side. The Davenport shop had one air drop, so we recommended adding a second before install day.
Lighting is a common miss. Shop LED strip lights overhead are fine for driving in but useless under a lifted vehicle. Every shop we install for adds either portable underbody LEDs (rechargeable, magnetic base) or a hard-mounted underbody light on the ceiling that shines down through the column gap. Davenport went with two eighteen-inch magnetic LED bars that live on chargers when not in use. Workflow surround also includes: tool cabinet placement, drain pan storage, floor jack access, and enough clear floor for the arms to swing to full extension. Sketch it before install day. Move whatever needs moving before we arrive.
Drawing the bay and marking column footprints
Two weeks out we sent Davenport a scaled drawing of their bay with the 2 post car lift column footprints marked in the exact anchor positions. That drawing is our final go/no-go check. The shop owner walked it through with his crew, confirmed nothing on the drawing conflicted with existing workbench, drain, or floor storage, and gave us the green light.
The drawing catches problems paper is cheap enough to catch. On one job we ran, the drawing showed a column footprint dead-on top of a floor drain. Customer had not noticed. If we had drilled first, we would have discovered the drain the hard way. On another job the drawing revealed that the buyer’s storage rack was fixed to the wall exactly where an arm would need to swing. He moved the rack the weekend before install. Davenport’s drawing was clean — nothing needed to move. Which meant on install day the crew walked in, taped the anchor pattern to the floor to match the drawing, verified rebar clearance one more time, and drilled. Every 2 post car lift install we do goes through the drawing step. It is boring. It is why install day is not a scramble.
What happened on install day
The Davenport install ran six hours flat. We arrived at 7 a.m. with the crated machine on our truck. Unloaded with their forklift by 7:30. Marked anchor patterns from the drawing by 8. Rebar-verified by 8:15. Drilling started at 8:30 and all eight anchors were set and torqued by 10. Columns plumbed and verified by 11. Hydraulic assembly and cable routing done by 12:30. Lunch. Power unit wired and cycled empty at 1:30. First test cycle with the shop’s own pickup at 2:30. Safety lock verification and crew training at 3. Wrapped and cleaned up by 4.
Six hours because the prep work was done. If any of the prep steps had been skipped — no rebar scan, no drawing, no electrical run, no ceiling verification — install day would have stretched to two days or ended in a return-freight situation. Every 2 post car lift install can run this cleanly if the prep four weeks out is done properly. The Davenport crew watched the entire install; the third-generation son on the crew ran the lift himself at the end. That is the handoff we design for.
Post-install prep for the first thirty days
Install day is not the end of prep — the first thirty days matter as much. We told Davenport to run the machine daily during break-in, watching for cable slap adjustments (natural stretch in the first cycles), any hydraulic weep from fittings (torque up any weeping fitting immediately), and safety lock engagement quality. We also gave them a laminated pre-lift checklist for the wall and a maintenance log for the tool cabinet.
Thirty days after install we drove back to Davenport for a scheduled check. Cables had stretched about a quarter inch as expected; we tensioned them. One hydraulic elbow fitting was weeping a drop a day; we snugged it. Everything else was tight. This thirty-day return visit is standard for every 2 post car lift we install. It catches the natural break-in issues that all machines have and prevents them from becoming service calls at month six. Related reading: slab specs, cost breakdown. Call 800-674-9302.
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