Choosing a third-party logistics provider comes down to four steps: define your requirements in numbers before you speak to anyone, shortlist providers who genuinely handle businesses like yours, compare them on service levels and full costs rather than headline rates, and check references before you commit stock to a building you cannot walk into.
The decision matters more than its size suggests. Your 3PL becomes your customer’s experience — their picking accuracy is your accuracy, their dispatch times are your delivery promise. A good one is close to invisible. A poor one damages a brand it did not build.
Before you start: define your requirements
Providers will shape your requirements for you if you arrive without them. Write these down first.
Volumes. Orders per month now, and what you expect in twelve months. Your peak month against your quietest, as a ratio — a business with a 5:1 December is a different proposition from one running flat all year.
Order profile. Average lines per order and units per line. This determines whether their picking method suits you and it is the number most often not asked for.
SKUs. How many you hold, how many are active, and how much space they need. Include anything seasonal you hold out of season.
Product characteristics. Size, weight, value, fragility. Anything needing temperature control, batch or serial tracking, expiry dates, or licensing — hazardous goods, alcohol, pharmaceuticals, food.
Channels. Your own site, which marketplaces, wholesale, retail. Each has its own labelling, packaging and delivery requirements, and retail supply in particular brings compliance obligations a general 3PL may not have met before.
Geography. Where your customers are, where you want stock held, and which markets you are planning to enter.
Service levels. Same-day dispatch cut-off, order accuracy standard, returns turnaround. Decide what you need before anyone tells you what is normal.
Value-added services. Kitting, bundling, gift wrapping, custom packaging, labelling, returns refurbishment.
Your systems. What you sell on, what your stock lives in, what your accounts run on.
That document is your brief. It makes quotes comparable and it tells providers immediately whether you are a fit.
The selection process, step by step
Step 1 — Define. The work above. Do not shortcut it; everything downstream depends on it.
Step 2 — Research and shortlist. Look for providers who already handle businesses of your shape — similar volumes, similar products, similar channels. A 3PL whose clients are all pallet-out wholesalers will struggle with small-parcel ecommerce however willing they are. Ask your suppliers, your peers, and your carriers who they see performing well. Shortlist four to six.
Step 3 — Evaluate and compare. Send the same brief to everyone so the quotes are comparable. Then visit the buildings — this is not optional, and providers who discourage it are telling you something. Look at how it is organised, how busy it is, whether locations are labelled, whether the returns area is under control. Ask to see their system in use rather than in a presentation.
Step 4 — Decide and onboard. Check references, agree the contract and service levels, then plan the transition properly: integration first, then stock transfer, then a shadow period on a small share of orders before going to full volume.
Expect the whole process to take two to three months for a first outsourcing. Rushing it is the most reliable way to choose badly.
The evaluation checklist
Services. Do they cover everything you need today, and the things you will need next year? Missing one service means either a second provider or a gap.
Experience with businesses like yours. Similar order profile, similar products, similar channels. Ask for specifics rather than accepting a general claim.
Technology and integrations. Which warehouse management system do they run, is it theirs or licensed, and how does it connect to your sales channels? Ask which of your specific platforms are already connected as standard, supported products — everyone says “we integrate with anything”, and the difference between a standard connector and a development project is weeks and thousands.
Visibility. Live stock figures by product, order status, and reporting you can pull yourself. A spreadsheet emailed on Mondays is not visibility.
Pricing and transparency. A full fee schedule in writing, including every charge that might appear. More on this below.
Carrier relationships. Which carriers, what rates, and whether you can use your own accounts. Their buying power is one of the main reasons to outsource, and it should be demonstrable.
Coverage and locations. Where their buildings are relative to your customers, and whether they can hold stock in more than one.
Scalability. What happens at four times your current volume, and what happens at peak. Ask specifically how they resource December and what their cut-off commitments are during it.
Financial stability. They will be holding your stock. Check company records, ask how long they have operated, and be cautious with anyone whose growth looks faster than their infrastructure.
Reputation and references. Two or three current clients of similar size, and ideally one who left.
Customer service. Who is your named contact, what happens when they are away, what the escalation route is, and what response times you can expect in writing.
Service level agreements. Written commitments with numbers attached — dispatch cut-off, order accuracy, returns turnaround, stock accuracy — and what happens when they are missed.
Compliance and accreditation. Whatever your sector requires: food safety, pharmaceutical standards, hazardous goods licensing, security accreditation for high-value goods.
Contract terms. Length, notice period, minimum volumes, price review mechanism, and the exit terms.
Questions to ask every 3PL
Copy these into your evaluation document and ask all of them, of everyone.
Operations
- What is your order accuracy rate, and how is it measured?
- What is your on-time dispatch rate against your stated cut-off?
- What is your same-day dispatch cut-off time?
- How do you handle peak, and what changes about cut-offs and accuracy during it?
- How quickly are returns processed from arrival to back in stock?
- How is stock accuracy maintained, and how often do you cycle count?
- What happens if you damage or lose my stock?
Technology
- Which WMS do you run? Is it your own or licensed?
- Which of my platforms do you already integrate with as a standard product?
- How often do stock figures update — live, hourly, or overnight?
- What can I see myself, and through what interface?
- Can you handle batch numbers, serial numbers or expiry dates?
- What happens to my data if I leave?
Commercial
- Can I have the complete fee schedule, including every incidental charge?
- How is storage charged — per pallet, per bin, per cubic metre — and when is it measured?
- What are the minimum volumes or minimum monthly charges?
- How and when can prices change?
- What is the contract length and the notice period?
- What are the offboarding costs if I move my stock?
Relationship
- Who is my day-to-day contact, and who covers when they are away?
- What is the escalation route at 4pm on a Friday?
- Can I speak to two current clients of my size, and one who has left?
- Can I visit the warehouse before deciding?
How 3PL pricing works
Quotes are hard to compare because the fee structures differ. Break every quote into these components and rebuild them on the same basis.
Receiving — per pallet, per carton or per hour to book your stock in.
Storage — per pallet, bin or shelf location per week or month. Ask when it is measured: an average across the month and a snapshot on the first of the month produce very different bills for a seasonal business.
Pick and pack — usually a charge for the first item in an order plus a smaller charge for each additional item. This is why your average lines per order matters so much to the real cost.
Packaging — either supplied by you or charged per unit.
Shipping — their negotiated carrier rate, sometimes with a margin added.
Returns — per item received and processed.
Value-added services — kitting, labelling, special packaging, usually per unit or per hour.
Account and setup fees — onboarding, integration, monthly minimums.
The only fair comparison is to take a real month of your orders — the actual mix of order sizes and products — and ask each provider to price that month in full. Headline per-order rates are close to meaningless when the fee structures differ. There is more detail on the components in what is a 3PL warehouse.
Common mistakes to avoid
Choosing on headline price. The cheapest quote is frequently the one with the most unlisted charges, and a low per-order rate with high storage costs is expensive for anything slow-moving.
Not modelling your real order profile. Providers quote on assumptions. If your orders average four lines and they assumed one, the real bill is far higher than the quote.
Skipping the site visit. The building tells you more in twenty minutes than the sales process will in a month.
Not checking the integration specifically. “We integrate with everything” is not an answer. Name your platforms and get a yes or no on each.
Ignoring peak. A provider comfortable at your average volume may be overwhelmed at four times it, and December is when the damage is permanent.
Not reading the exit terms. Long lock-ins, high offboarding fees and long notice periods are easy to accept when you are optimistic and expensive when you are not.
Choosing a provider too large for you. A small account inside a large 3PL gets the attention a small account gets. Being a meaningful client of a mid-sized provider is usually better service.
Choosing one too small. The mirror problem — a provider who cannot grow with you means doing this again in eighteen months.
No written service levels. Without numbers in the contract, performance is a matter of opinion.
Going to full volume on day one. Run a small share of orders first and scale over a week or two. Problems found at 10% of volume are inconveniences; the same problems at 100% are a crisis.
When should you switch 3PLs?
Switching is disruptive and sometimes necessary. The signals:
- Accuracy or on-time dispatch has declined and not recovered after being raised formally
- Costs have risen without a corresponding change in service or volume
- They cannot support a channel, market or service you now need
- Communication has deteriorated, or your contact changes constantly
- Errors are repeated after being raised more than once
- You have outgrown their capacity, or they have outgrown their interest in your account
- Their financial position has become a risk to your stock
Before you move, raise it formally. A documented conversation with specific numbers resolves a meaningful share of problems, and it gives you evidence if it does not.
If you do move, run both in parallel briefly if you can, transfer in stages rather than all at once, and count everything as it arrives — stock discrepancies during a transfer are normal and much easier to resolve whilst the old provider still has records.
Where to go deeper
- What is a 3PL — what you are actually buying.
- What is a 3PL warehouse — the building, services and pricing in detail.
- 3PL vs 4PL — whether you need a management layer instead.
- What is order fulfilment — the process being outsourced.
- What is a fulfilment centre — the type of building you want for ecommerce.
- Omnichannel fulfilment — if you sell across several channels.
The one-line takeaway
Choose a 3PL by writing your requirements in numbers first, shortlisting providers who already handle businesses of your shape, comparing them on a real month of your own orders rather than headline rates, and visiting the building before you commit. The site visit and the reference call catch more than the tender document ever will.
Frequently asked questions
How do I choose a 3PL? Define your volumes, order profile, SKUs, channels, geography and service levels in numbers first. Shortlist four to six providers who already handle businesses like yours, send them all the same brief, visit the buildings, compare the quotes against a real month of your own orders, and check references before committing.
What questions should I ask a 3PL? Their order accuracy and on-time dispatch rates and how they measure them, their same-day cut-off, how they resource peak, which of your specific platforms they already integrate with, the complete fee schedule including incidentals, the contract and exit terms, and who your named contact is when something goes wrong on a Friday afternoon.
How is 3PL pricing structured? Typically receiving per pallet or carton, storage per location per week or month, pick and pack as a first-item charge plus a lower per-additional-item charge, packaging, shipping at their carrier rates, returns per item, and setup or monthly minimums. Because the structures differ between providers, the only fair comparison is to have each price a real month of your orders.
How long does 3PL onboarding take? Integration is usually days to a few weeks for standard platforms and longer for anything custom. Stock transfer and receiving adds one to two weeks. Allow six to eight weeks from signing to full volume, and run a small share of orders first rather than switching everything on day one.
Should I visit the warehouse before choosing? Yes, always. The building shows you how organised the operation is, whether locations are labelled, how the returns area is managed, and how busy they really are. A provider who discourages a visit has answered a different question.
How many 3PLs should I shortlist? Four to six for a first outsourcing. Fewer gives you no basis for comparison; more turns the evaluation into a project of its own. Send all of them the same written brief so the quotes can be compared on the same basis.
When should I switch 3PL? When accuracy or dispatch performance has declined and not recovered after being raised formally, when costs have risen without a service change, when they cannot support a channel or market you now need, or when errors repeat after being raised more than once. Raise it formally first — a documented conversation with numbers resolves a good share of problems.
Warehouse Wise is a free, independent library of guides on inventory management, warehousing and fulfilment, written for the people actually doing the work — new warehouse and inventory staff, small and growing retail and ecommerce businesses, and anyone who holds stock and wants to understand it properly. Every guide explains the term, shows a worked example with real numbers where it helps, and stops. We are independent: we do not sell software or equipment, we take no commission on referrals, and our guides are not ranked by who pays us.