Choosing a 3PL: when does outsourcing your warehouse make sense, and how to choose?

When does it make sense?

Signs that favour outsourcing	Signs that favour keeping it in-house
Warehousing is not a core competence; your focus is product and sales.	Warehousing is where you differentiate (speed, special packing, service).
Volume is uncertain or seasonal; fixed space and staff are risky.	Volume is high and stable; you have scale advantage.
You want to enter a new region or channel quickly.	Your operation needs special equipment, automation or regulatory controls.
Internal IT and warehouse management capacity is limited.	You have a strong operations and IT team.

Before deciding, the “WMS or ERP module?” tool also weighs the outsourcing option; calculate the 5-year cost of running your own warehouse in the ROI / TCO calculator and compare it with 3PL quotes.

Prepare before requesting quotes

At least a year of volume profile: daily/monthly orders, lines, cartons, pallets; peak periods.
Product profile: SKU count, dimensions and weights, lot/expiry/serial needs, temperature conditions.
Scope of services: receiving, storage, picking, packing, value-added services, returns, shipping.
Service-level targets: same-day dispatch, cut-off times, accuracy, dock-to-stock time.
Integration needs: ERP, e-commerce channels, carriers, e-waybill.

Pricing models

Model	How it works	Watch out for
Unit (transaction) based	Storage per pallet-day or m³, handling per receipt and dispatch, picking per line or order, fees per value-added service.	Define every unit in writing; ask about minimum billing and rounding rules.
Fixed space + variable transactions	Fixed fee for dedicated space, unit prices for transactions.	If volume drops, you still carry the fixed space cost.
Open book (cost-plus)	Actual costs plus an agreed management fee are invoiced.	Write efficiency incentives and audit rights into the contract.

When comparing quotes, convert each to a monthly and annual total using the same volume profile; a quote with low unit prices may cost more under different unit definitions.

The 3PL's WMS and visibility

When you work with a 3PL, your warehouse runs on their system. How quickly and reliably you see your stock, orders and performance depends on the 3PL's WMS and integration capability. For the capabilities to look for in the systems 3PLs use, see our 3PL sector guide.

Which WMS do you use? Is there a client portal, and which reports does it show?
Who will build and maintain the integration with our ERP and sales channels, and who pays?
How are stock discrepancies reported and compensated?
Which other clients do you serve in the same warehouse? How are resources prioritised during peaks?

Measures in the contract

Measure	Define it clearly in the contract
Order accuracy	Are wrong items, short quantities and damage counted separately; is the source customer complaints or checks?
On-time dispatch	Share of orders received before cut-off that ship the same day.
Dock-to-stock time	Time from vehicle arrival to stock being available for sale.
Inventory accuracy	Counting method, frequency and variance tolerance.
Returns processing time	Time from receipt of a return to restocking or disposal.

Write down reporting frequency, the service credits that apply when targets are missed and the corrective-action process. The data, SLA and exit sections of our contract guide also apply to 3PL contracts.

Transition and exit plan

Plan the transition outside peak season; write down how stock transfer, counting and the opening balance will be verified.
Test integrations end to end with trial orders before go-live.
Agree in advance how stock, data and transaction history are handed over at the end, and the support and fees during transition.
Talk to reference clients, especially about the first weeks after transition (reference questions).

WMS solutions 3PLs may use whose directory sources mention 3PL

The list is alphabetical and based on whether each solution's own sources mention this sector; it is not a ranking or recommendation. Checked: 2026-09-18.

Open the WMS finder for this sector →

Method and corrections: editorial policy.