What to Ask on a 3PL Site Visit (and What the Building Tells You)

On a 3PL site visit, ask for specific evidence rather than general assurances. "What's your inventory accuracy?" gets a number from a slide. "Pick a location on the screen and let's walk to it" gets the truth in about four minutes. The building answers most of your questions before anyone speaks: what is sitting on the dock, how the racking looks, and whether the system matches the shelf.

Most shippers tour a facility once, in the middle of a sourcing process, guided by the person whose job is to win the account. That is not a criticism of the person giving the tour. It does mean the tour is designed to show you the building at its best, and your job is to see it on an ordinary Tuesday.

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TL;DR: A useful 3PL site visit follows the freight. Ask for operating numbers before you arrive, start at the receiving dock, read the racking and aisles for housekeeping, ask exactly how your inventory will be segregated, test the warehouse management system (WMS) screen against a physical location, and ask about labor mix, supervisor tenure, and the injury log. Specific requests ("show me last month's dock-to-stock times") get honest answers; general ones ("how's your accuracy?") get marketing. Start by emailing the operator three numbers you want to see on the day.

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Step 1: Ask for the numbers before you arrive

Send a short list a week ahead, so the answers are prepared rather than improvised. Three are enough to start:

• Dock-to-stock time for the last three months: the elapsed time from a trailer arriving to the product being available to pick.
• Inventory accuracy, and which formula they use. Location-level accuracy (locations counted with zero variance, divided by locations counted) is the honest version. Piece-level accuracy is legitimate but reads several points higher on the same building.
• Order accuracy for the last three months, and how a mispick is caught and counted.

The KPI field guide covers how each of these warehouse metrics is defined and where it lies. There is no independent public benchmark for any of them, so the value is not in comparing the number to an industry average. It is in whether the operator measures it at all, whether they can tell you how, and whether the number on paper survives what you see on the floor.

If you have already issued a bid request, these belong in it too. The guide on how to scope a warehousing RFP covers the volume and storage profile a 3PL needs from you to price honestly.

Step 2: Start at the dock, not the conference room

Ask to begin at receiving. The dock is where volume meets labor, and problems there show up physically, as freight on the floor.

Look at what is staged in the receiving area and ask when it arrived. A few pallets from this morning is normal. Pallets with yesterday's date on the paperwork, or no paperwork at all, mean the building is receiving faster than it can put away. That backlog is where inventory accuracy usually starts to slip, because product sitting in staging gets partially put away, partially picked from, and never reconciled.

Questions that get specific answers here:

• "What arrived yesterday, and is any of it still on the floor?"
• "What happens when a trailer shows up without an advance ship notice?"
• "Show me how a damaged carton is recorded and how the client hears about it."

The last one matters more than it sounds. Damage gets recorded somewhere in most buildings. What you want to know is whether you will hear about it the same day or discover it at the next physical inventory.

Step 3: Read the racking and the aisles

You do not need to be a rack inspector to read racking. Walk a few aisles and look for:

• Damaged uprights: bent, creased, or patched columns, especially at forklift height near the aisle ends.
• Missing beam locks (the small clips that keep a beam from lifting out of the upright) and missing load capacity signs on the rack ends.
• Product in the aisles: pallets parked on the floor because there was nowhere else to put them.
• Location labels that are missing, handwritten over, or obviously reused.

None of these is a verdict on its own. Most busy buildings have a dinged upright somewhere. A pattern of them tells you how the building is run when nobody is touring it. The operator-side version of this walk is our guide to running a warehouse safety walk-through, and it is a useful list of what a well-run building checks on itself.

Housekeeping is the cheapest signal available. A building that keeps its aisles clear during a busy week is usually a building that follows its own procedures in other places too.

Step 4: Ask how your inventory will be kept separate

In a multi-client building your product shares space with other people's. Ask exactly how it will be kept apart, physically and in the system:

• Will your inventory sit in dedicated locations, or can any location hold any client's product?
• Where do held or quarantined goods go, and who can release them?
• If you need lot, expiration, or serial number tracking, is it captured at receiving, or added later by hand?
• If you need food-grade, temperature-controlled, or bonded storage, which part of the building is it, and can you see it on this visit?

Shared locations are not wrong. Many well-run 3PLs mix clients deliberately because it uses space better. What you want is a clear, specific answer. "The system handles it" is not one; "every location is client-assigned and the scanner blocks a put to the wrong client" is.

Step 5: Test the WMS screen against the floor

Most tours include a look at the warehouse management system. It will usually be a dashboard, and dashboards usually look tidy. Ask for one small test instead: have the operator pull up a location at random (one you point to on the screen, not one they choose) and walk to it together. Does the product, the quantity, and the lot on the shelf match the screen?

One location proves little statistically. What it tests is the operator's reaction. A confident operator walks you there. A hesitant one tells you something about how often they check.

While you are at the screen, ask what you will see as the client: whether you get a live inventory view or a daily report, how quickly a receipt appears in it, and what happens to your data if you leave.

Step 6: Ask about the people, not just the building

Labor is most of what you are buying. Ask:

• What share of the floor is permanent staff, and what share is temporary?
• How long have the shift supervisors been here?
• How is training recorded for someone who starts next week?

High temporary-labor use is not a red flag on its own, particularly heading into peak season. Supervisors who have been there for years are the stabilizer that makes temporary labor work, so supervisor tenure is often the more telling answer.

Ask about safety in the same plain way. Warehousing ran 4.8 recordable injuries and illnesses per 100 full-time workers in 2024, according to the Bureau of Labor Statistics. Most employers with more than ten employees keep an OSHA injury log, and the annual summary of it must be posted in the workplace from February 1 to April 30 each year. Asking how the operator uses its log, and what changed after the last recordable incident, gets you a better conversation than asking whether they are "a safe building." The answer tells you whether safety is managed or merely hoped for. It does not tell you whether a building is compliant, and you should not treat it as if it did.

Finally, ask for the operator's warehouse legal liability certificate. That policy covers goods in their care, which a general liability policy usually does not. The guide to what each warehouse insurance policy actually covers explains the difference and what limits to ask about.

What a good operator will happily show you

A well-run 3PL usually enjoys this kind of visit. The operators with good numbers want the chance to prove them, and specific questions let them do it. Expect them to walk you to the dock without being asked twice, to name their accuracy formula, and to pick a location off the screen without fuss.

Reluctance is worth noticing, but read it fairly. "We can't show you another client's inventory" is a correct answer, and you would want the same protection. "We don't really track dock-to-stock" is a different kind of answer. So is a tour that stays in the office and the newest part of the building.

If you are comparing several operators, write the answers down on the same sheet for each visit. Memory flatters whoever gave the best tour.

For operators reading this: these are the specifications and capabilities a shipper is trying to confirm in person, and much of it (clear height, storage types, certifications, special handling) can be stated before anyone books a visit. A structured listing on the American Warehouse Index puts those facts in one place a buyer can check before the first call.

The minimal version

If you only have an hour: start at the dock and ask what arrived yesterday, walk two aisles, and pick one location off the WMS screen and go look at it. Those three things will tell you more than the presentation.

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This post provides general operational guidance for educational purposes. What to inspect and ask on a site visit should be adapted to your products, volumes, and any regulatory requirements that apply to your goods.