2-Post vs 4-Post Car Lift for a Home Garage: Ceiling, Slab, Space and the Work

The two designs

Two-post: two columns anchored to the slab, four swing arms with pads that meet the vehicle's frame lift points, the wheels in the air. Overhead (clear-floor) models join the columns with a beam that carries the hydraulic line and a shutoff bar (the 10AP's is at 139.5 inches); floorplate (baseplate) models run the line across the floor in a plate and keep the overall height lower (the 9APF is 123 inches against the 10AP's 145). Four-post: four columns with two runways between them, the vehicle driven on and lifted on its wheels; the runways carry a sliding jack tray for a bridge jack when the wheels need to come off; the lift is freestanding (BendPak's description of the HD-9) and takes a caster kit, which is why the Atlas is sold as portable.

The figures

	BendPak 10AP (2-post)	BendPak 9APF (2-post, low ceiling)	Atlas 9KOHX (2-post)	BendPak HD-9 (4-post)	Atlas Garage Pro 8000 (4-post)
Capacity	10,000 lb	9,000 lb	9,000 lb	9,000 lb	8,000 lb
Overall height	145 in	123 in	138 or 142 in	88 in	83 in (columns)
Rise	69 in; 82.5 max with pad	70 in; 73.5 with pad	74 in; 81 with adapters	70 in; 75 max lifting height	72 in to top of runway; 67 under
Min pad or runway height	4 in	4.5 in	4 in	5 in runway (4.5 in description)	Runway 4.5 in thick
Width	135 to 145 in	136 to 146 in	134.5 in	110.25 in	115 in with motor
Length	Column footprint	Column footprint plus floor plate	Column footprint	200.5 in overall (174 outside)	206.75 in with ramp
Anchored	Yes; 4.25 in, 3,000 PSI, 28-day slab (manual)	Yes (BendPak concrete page)	Yes; 4 in, 3,000 PSI (dealer)	Freestanding (page); caster kit optional	Freestanding; casters included (dealer)
Power	208-240 V, 1 Ph, 3 HP, about 11 A (manual)	208-230 V, 1 Ph, 5 HP	220 V, 1 Ph; dealer recommends a 30 A breaker	208-230 V, 1 Ph, 2 HP	110 V; dealer says a 30 A breaker
ALI certification	Named on the product page; in ALI's directory	Not stated; not in ALI's directory	Dealer: none claimed; not in ALI's directory	Not stated in the text, but in ALI's directory	Dealer: none claimed; not in ALI's directory
Shipping weight	1,768 lb	Not read	Not read	1,616 lb	1,800 lb
Price (Oct 9, 2026)	$6,095	$6,295	$2,599 (dealer)	$6,095	$3,399 (dealer)

Ceiling

A four-post wins on the columns: 83 to 88 inches of lift against 123 to 145 for the two-posts. But a four-post lifts the car on its wheels, so the car's full height rides up with it; the 10AP lifts by the frame and the car's roof is at the same height as on a four-post at the same rise. The arithmetic is the same (the calculator): roof height plus rise plus margin under the ceiling. The real difference is whether the lift itself fits: a 145-inch 10AP needs a 12-foot-plus ceiling for the columns before the roof is considered; an 88-inch HD-9 fits under 8 feet and then lifts a 60-inch car about 30 inches. The 9APF exists for the 10-foot ceiling. The ceiling and concrete guide has every height.

Slab and anchors

The two-post is anchored and the slab is the requirement: BendPak's 10AP manual says steel-reinforced, 4.25 inches, 3,000 PSI, cured 28 days, anchors more than 6 inches from joints and walls; Atlas's dealer says 4 inches at 3,000 PSI; the MaxJax manual bans drilling post-tensioned slabs. A nominal 4-inch residential slab is at or under those figures and BendPak says to test drill. The four-posts are freestanding: no drilling, which is the whole case for them on an unknown slab, on a rental, or on a floor you may want back.

The work

Two-post: wheels, brakes, suspension, exhaust, transmission, everything under the car with the wheels off, because the wheels hang free and nothing is in the way of the underside except the arms. Four-post: oil changes, exhaust, inspection, undercoating and storage with the wheels on the runways; wheels-off work needs a bridge jack on the runways (the Garage Pro 8000 ships a jack tray, BendPak sells rolling jacks for the HD-9), which lifts the car a second time off the runways. A home mechanic who pulls wheels every weekend wants the two-post; one who stores a second car and does oil changes wants the four-post.

Storage

The four-post parks a car in the air with another under it, in a 200-inch-long footprint: the HD-9's 174-inch outside length and the Garage Pro's 206.75 with ramp are the depth of a bay. A two-post cannot store a car in the air for long without a reason; the makers' manuals cover leaving a vehicle on the locks, and the arms are not a parking space. If the question is "two cars in one bay", it is a four-post question.

Space and portability

Two-post: 134 to 146 inches of width at the columns, a column footprint in length, and the full bay width lost to the doors opening between the columns. Four-post: 110 to 115 inches wide, 200-plus long, and the car is driven on, so the bay's length matters more than its width. The four-post rolls on casters (HD-9 optional, Garage Pro included) to clear a bay; the two-post is a fixture once anchored, which is what the MaxJax and QuickJack were designed to answer.

Price

At BendPak, a two-post and a four-post of the same class cost the same ($6,095 for the 10AP and the HD-9). At Atlas, through a dealer, the two-post is $2,599 and the four-post $3,399. Installation is extra for either and is more for the anchored two-post; the electrician is required for both (the electrical guide); a bridge jack for a four-post is a separate line.

Which to buy

Two-post if: the ceiling clears the columns, the slab passes (test drilled, not assumed), the work is wheels-off, and the bay is wide. Four-post if: the slab is unknown, post-tensioned or thin; the garage is a rental or the floor may be wanted back; a second car needs storing; the ceiling is low; or the work is oil changes and exhaust. Neither if the ceiling is 8 feet and the slab is 4 inches and the budget is $3,000: that garage is the portable lift or scissor lift garage. The two-post guide and four-post guide rank the models.