Your freight elevator's throughput is your building's throughput — get vertical flow wrong and every other optimization is theater.
Here's my verdict up front: in a multi-floor warehouse, the freight elevator isn't a piece of equipment. It's the speed limit for the whole building. You can perfect your slotting and shorten every pick path, but the moment forklifts start queuing at the elevator doors, none of it matters.
I saw it play out last year at a three-story distribution center south of Los Angeles — I'll skip the name. Mid-afternoon, right in the middle of the outbound wave: finished pallets coming down from the second floor, inbound freight going up from the first, and three forklifts lined up in front of a single 5,000-pound freight elevator. I stood there with my phone's stopwatch. Doors close, car goes up, doors open, forklifts roll in and out, car comes back down — a full round trip took over three minutes. The third forklift in line waited almost eleven minutes. The driver killed the engine and scrolled his phone. Eleven minutes of wages paid, orders sitting in the system, and nobody treating it as a problem. That's the nasty thing about vertical flow: the waste is invisible. It belongs to no single process, so it never shows up on any report.
Those ten-minute waits at the elevator doors are quietly eating your shift — and the math to prove it fits on an index card
Most warehouses measure pick speed and putaway speed. Almost nobody measures "waiting for the elevator," because that time dissolves into everyone's labor hours and nobody can point at it.
Quantifying it is gloriously low-tech. Take your phone to the elevator landing, spend half a day there, and record three things. First, the true cycle time of one complete round trip — doors, travel, loading and unloading, all of it. Second, how many cross-floor moves the operation demands per hour at peak. Third, the worst queue you see: how many trucks waiting, and how long each one waits. With those three numbers you get the formula: wasted labor hours per day equals queued trips times average wait. Multiply by your own fully loaded labor rate — driver wages, forklift depreciation, power, you know your numbers better than I do — and the hidden cost appears. I ran a rough version of this for that LA building: across the two daily outbound peaks, the queueing burned enough labor hours in a month to cover half an additional driver. That money isn't spent, it leaks — which is why nobody feels it and nobody plugs the hole.
Two details people routinely miss. First, rated capacity versus real capacity: the number on the plate is one thing, what actually fits in the car is another. A 5,000-pound car takes a sit-down forklift plus two pallets, tops. Older buildings have smaller cars that a forklift can't even enter, so everything gets shuttled on pallet jacks — throughput per trip gets cut in half and the queue only grows. Second, the single point of failure: in a one-elevator building, a breakdown or a scheduled maintenance shutdown stops every cross-floor move in the building. I've seen a warehouse where a three-day elevator overhaul stranded thousands of pallets upstairs. If your contingency plan doesn't answer "what happens when the elevator stops," you've handed the whole building's fate to one machine.
Before you spend a dollar on another elevator, sort out who goes up, who goes down, and when
When the queue gets bad, the first instinct is "add another elevator." Hold on. Adding a freight elevator is a construction project: shaft, structural reinforcement, fire approvals. Many older buildings can't take one at all — load-bearing structure and fire compartmentation kill the idea before it starts. And where it's possible, price it against real local contractor quotes; it's serious money. The part that stings: I've watched operations spend big on a second elevator only to see the bottleneck move from the elevator landing to the dock doors. The problem wasn't solved, it relocated.
There are three cheaper fixes, in order. First, stagger by time: keep inbound-up and outbound-down traffic out of the same hour. Tie wave planning to elevator scheduling — which floor gets the car in which window, booked ahead, peaks deliberately separated. This costs nothing but discipline, and in my experience it clears a surprising share of the queue, because most elevator congestion is really just two processes colliding on the clock. Second, zone by floor function: fast movers and heavy freight live on the ground floor, cutting total cross-floor volume at the source. This one belongs in the lease-signing and floor-planning stage; re-slotting thousands of pallets after move-in costs at least double, and by then the elevator queue has become "just how things are." Third, run the elevator like it matters: never send the car up empty, batch loads to fill it, and during peak put one person at the landing directing traffic like a crossing guard. The effect is immediate, and it forces everyone to see the elevator as shared capacity rather than a free good.
Do those three, and if peak still queues, then talk about a second car or a higher-capacity one. By then you'll walk in with measured data — trips per day, minutes waited, labor hours lost — and negotiate from strength instead of frustration.
Which brings me to site selection. When you're touring a multi-floor building, vertical flow is a mandatory line item on your checklist, and you verify it yourself — don't take "we have two freight elevators" from leasing at face value. Four things: rated capacity, whether your forklifts physically fit in the car, a stopwatch-timed round trip, and whether your outbound waves collide with the building's peak elevator demand. Half a day on site with a stopwatch before you sign beats any brochure. The three-story logistics building that opened in Seattle in 2018 had its elevator configuration and vertical circulation debated across the industry for years afterward — in multi-floor warehousing, the vertical-flow page of the math is the one nobody gets to skip.
One question to take back to your building: how many empty trips did your freight elevator make today, and how many minutes did it keep trucks waiting? If you can't answer that, it's quietly eating your margin — just off the books.
