Questions to Ask a 3PL Before You Sign: 40+ to Cover

Three proposals land in the same week. Each one lists a rate card, a facility, a go-live date, and a promise of great service. On paper they look alike, so the brand leans toward the lowest number. Six weeks after go-live, the questions nobody asked start to matter: who handles the retail labels, what happens when the building is full in December, and who actually picks up the phone.

The best questions to ask a 3PL before you sign are the ones that turn a proposal's labels into a description of the real operation. This guide covers the questions to ask across cost, capability, service levels, and fit, a short list that most brands forget, and how to check the answers before you commit.

What are the best questions to ask a 3PL?

The best questions ask for a description of the operation, not a yes or no. Every question should map to something you need (the requirement) and something the provider can prove (the evidence). A provider can answer "yes" to almost anything. It is much harder to answer "what does that look like in your building today?" without being specific.

Labels hide the most. "B2B" can mean single-unit, multi-SKU orders to a boutique, which is close to direct-to-consumer work for a provider. It can also mean full pallets into a retailer with EDI and a strict routing guide, which is a different operation with a different cost structure. "Kitting" and "DTC" hide the same range. Before you score anything, find out which version your brand needs and which version the provider runs.

A workable order of operations looks like this:

1. Write your requirements first. Volume and seasonality, units per order, SKU count, channels, retailers, storage needs, and why you are running the search at all.
2. Group your questions into four areas. Cost, capability, service levels, and fit.
3. Ask every provider the same questions. Identical questions are what make the answers comparable.
4. Ask for proof. Rate cards, written SLAs, named references, and a look at the facility.

The next four sections give the questions to ask in each area.

What cost questions should you ask a 3PL?

Ask for every fee, not the headline rate. A low base rate propped up by surcharges and minimums is often the most expensive quote in the pile, so the goal is to compare the total landed cost for your real volumes.

The rate card.

• Can you send a complete rate card with every fee listed (receiving, storage, pick, pack, value-added services, implementation)?
• What is not included in this quote?
• Which fees are fixed, which are variable, and what triggers an extra charge?

Surcharges and minimums.

• Is there a minimum monthly order volume or a minimum monthly invoice, and what happens if I fall short?
• What do fuel, peak, and accessorial charges look like, and how do you calculate dimensional weight?
• How do you bill partial pallets? This is where surprise costs tend to live.

Contract terms.

• How much notice do I get before a price increase, and is there a cap on adjustments?
• Does the contract auto-renew, and what does it take to exit?
• Will you model my actual volumes and seasonality, so I can see a pro forma and not a generic quote?

Line up the answers side by side before you compare totals. Some providers quote all-in and others quote a bare base rate, and the two look the same until you normalize them. If a provider's pricing depends on order value, such as a share of sales with a cap, run it against your real order values. Where transportation rests on spot quotes or variable accessorials, ask for an auditable cost per shipment.

What capability questions should you ask a 3PL?

Ask which facility will serve you, what is live there today, and who else ships the way you do. Capability is where a proposal's labels matter most, because a provider can describe a service it offers somewhere in its network and not in the building that would hold your inventory.

Facility and network.

• Which facility would serve my account, and what are its current monthly shipments?
• What storage types, certifications, and special handling does that site support today?
• Where are your other locations, and do you offer distributed inventory?

Channels and compliance.

• Which retailers and marketplaces do you ship to today, and which of my categories do you already run?
• How do you handle routing guides, labeling, EDI and ASN requirements, and appointment scheduling?
• Can you ship on a retailer's own carrier account? How do you handle chargebacks?
• If I sell through several channels, how do you allocate inventory across them?

Throughput and growth.

• What volume can this site handle at my peak, and how much of its capacity is already committed?
• What triggers an expansion, and how much growth can you absorb without adding space?

Systems.

• Which warehouse management system do you use, and can I see a demo?
• Do you have an open API, and which platforms integrate natively (checkout, ERP, returns)?
• How long does a typical integration take for the platforms I use?

The throughput questions matter most for brands with sharp peaks. A building that runs well at 200 orders a day can struggle at 400, and the difference shows up in receiving, labor, and carrier cutoffs first. Our post on what breaks first when an outgrown 3PL hits peak goes deeper on the warning signs.

What service level questions should you ask a 3PL?

Ask for written targets, how they hold at peak, and what happens when they are missed. A promise of great service is only useful if it appears in the contract with a number, a way to measure it, and a remedy.

Targets in writing.

• What are your written SLAs for receiving time, order cycle time, order accuracy, and on-time shipping?
• What is your current on-time shipping and order accuracy performance, and can I see the last few months?
• What is your cutoff for same-day shipping, and does it change in peak?

Peak and exceptions.

• Do those targets hold in peak season, and how do you staff for it?
• What training and quality checks do temporary workers get?
• What errors have you made in the past, and what did the corrective action plan look like?

Remedies and reporting.

• What is the financial remedy when you miss an SLA?
• Who is responsible for damage that happens inside your building, and how do claims work?
• Which KPIs and reports will I receive, and how often?

Agree on definitions before you sign. Two sides can count "on time" or "accurate" differently and both be telling the truth. Our fulfillment KPI breakdown covers how to define the metrics so both sides measure them the same way.

What fit and onboarding questions should you ask a 3PL?

Ask who will run your account, how the transition works, and how the provider has grown with brands like yours. Fit decides how problems get handled after the contract is signed, and it is the area where a polished sales process tells you the least.

People and communication.

• Who will be my day-to-day contact, how many clients do they manage, and can I meet them before I sign?
• What is your average response time for routine questions, and what does escalation look like when something goes wrong?
• Is my fulfillment handled by your own employees, outsourced staff, or a combination?

Onboarding and transition.

• What is your onboarding timeline from signed agreement to go-live, and what do you need from me at each step?
• What does support look like in the first 90 days?
• Are there dates when you do not onboard new clients? Many providers protect their own peak and avoid new accounts between November and mid-January.

Track record.

• What share of your clients look like my brand in size, channels, and product category?
• How have other brands scaled with you, and what is your client retention rate?
• Can I speak with two or three current clients about communication and responsiveness?

Also tell the provider why you are running this search. If service failures are what you are leaving behind, the SLA answers should carry more weight in your decision. If margin pressure is the driver, cost will weigh more. Providers give better answers when they know which problem they are being asked to solve.

Which questions do most brands forget to ask a 3PL?

Most brands forget the questions about capacity limits, account ownership, past mistakes, and billing edge cases. They sit outside the standard checklist, and the answers say more about a provider's culture than a rate card does.

What happens when you are at capacity? You want the overflow plan before you need it, not in the second week of December.

Who owns our account day to day? Ask for a name, not a department, and ask to meet that person before you sign.

Walk me through your last big mistake. How a provider describes an error, what changed afterward, and whether they volunteer specifics all show how they behave when something goes wrong.

How do you bill partial pallets, and what else is billed that is not on the rate card? Surprise costs tend to live in the edge cases.

What share of your clients look like us? A provider built for enterprise accounts may not serve a 500-order-a-month brand well, and the reverse is also true.

What red flags should you watch for in answers?

Some answers should slow you down:

• "We'll provide detailed pricing after we learn more about your business."
• Rate cards with vague line items such as "handling fees" or "administrative charges."
• "We'll assign an account manager after you sign."
• No clear onboarding plan or timeline.
• "Market rate adjustments" with no cap, or long contracts that auto-renew.
• Reluctance to share retention numbers or connect you with current clients.
• A rushed sales process that does not answer your questions.

One vague answer is a prompt to ask a follow-up. A pattern of vague answers is a signal about how the relationship will go.

How do you check a 3PL's answers before you sign?

Check them with references, a site visit, and a side-by-side score. A well-written answer with no evidence behind it should not outscore a proven one, so treat every claim as unconfirmed until something outside the proposal backs it up.

Call references that look like you. Ask for two or three current clients with a similar size, channel mix, and product category. Ask about communication, responsiveness during busy periods, and how problems were handled. A claim a reference backs is confirmed. A claim a reference contradicts is a gap you need to resolve.

Visit the facility, in person if you can. Look at how receiving is organized, how look-alike products are stored, how packing stations work, and how busy the building is. A virtual tour is a reasonable fallback and may leave a few items to confirm later.

Validate peak. Ask how the provider staffed and performed in its last peak, and who was added to the team. Providers protect their own peak, so confirm that your account fits inside it.

Meet the account team. Confirm that the person named in the proposal will actually run your day-to-day work.

Score the whole solution. Normalize total landed cost first, then weigh it against capability, service levels, and fit using the priorities you set before you read any proposal. One common default for a cost-driven search is roughly 40% cost, 30% capability, 20% service levels, and 10% fit. Shift the weights toward service levels if service failures are why you are leaving, or toward capability if your handling needs are complex. DCL Logistics lists on-time delivery, inventory accuracy, order speed, and customer satisfaction among the metrics worth evaluating, which is a useful starting point for the service-level column.

Mark how confident you are in each score. "Confirmed" means a reference or document backs it. "Verify" means you still need to check. "Not disclosed" means the provider has not answered. The open items become your follow-up questions before the final decision.

Start your RFP on Slotted

The questions above work best when every provider answers the same ones, in the same format, against the same description of your business. A structured RFP does that. It gives each provider your volume, channels, peak profile, and requirements, and it gives you comparable answers to review side by side. Start your RFP on Slotted.

Frequently asked questions

What questions should I ask a 3PL before signing?

Ask about cost, capability, service levels, and fit. For cost, ask for a complete rate card and what is not included. For capability, ask which facility will serve you and which channels and retailers it already runs. For service levels, ask for written targets, peak performance, and remedies. For fit, ask who runs your account and how onboarding works.

What should a 3PL RFP include?

A 3PL RFP should describe your volume and seasonality, units per order, SKU count, channels and retailers, storage and handling needs, returns, and the problems you are trying to solve. It should ask every provider the same questions and request a full rate card, written service levels, and references, so the answers can be compared side by side.

How many 3PLs should I compare?

Compare a small group, not a long list. Vetting a provider well takes reference calls and a site visit, and those take time. Start wider so you have options, then narrow to a few finalists you can evaluate in depth.

What are red flags when choosing a 3PL?

Watch for pricing that is promised only after you sign, vague fee line items, an account manager assigned after signing, no clear onboarding plan, uncapped price adjustments, auto-renewing long contracts, and reluctance to share retention numbers or client references.