3PL vs in-house fulfillment

A third-party logistics provider stores your stock in its warehouse alongside other clients' stock, receives your inbound shipments, picks and packs your orders and hands them to carriers. You send orders and stock; it sends back shipments, stock reports and an invoice.

In-house fulfillment means you run the warehouse yourself: you lease the space, buy the racking and equipment, choose the software, hire the team and manage the daily work. The building can be a small unit behind the office or a large distribution center. Some businesses use both, keeping core products in-house and sending a region, a channel or peak overflow to a 3PL.

The difference is not only who does the work. It changes what you manage: with a 3PL you manage a supplier relationship and a contract, while in-house you manage people, space and equipment directly.

A 3PL bills per activity: receiving, storage per pallet or bin, a pick fee per order and per item, packaging, and often monthly minimums and account fees. The bill rises and falls with volume, which protects you in a slow month. In-house costs are mostly fixed. Rent, salaries and equipment cost the same whether you ship 500 orders or 5,000.

A simple break-even helps frame the decision. For illustration, suppose running your own space costs 30,000 a month in rent, staff and systems, plus 2 per order in packaging and consumables. If a 3PL's all-in cost is 7 per order, the two match at 6,000 orders a month. Below that, the 3PL is cheaper; above it, in-house pulls ahead. Real quotes are more complex, so model your own order profile, including items per order, storage per SKU and seasonal swings.

Remember the costs that sit outside the quote. With a 3PL, include inbound freight to its site and time spent resolving discrepancies. In-house, include management time, recruitment, insurance, equipment maintenance and software.

In-house, you decide the cut-off time, how a gift order is wrapped, which orders go first on a busy day and how a mistake is fixed. If the packaging or the unboxing is part of your brand, that control matters.

With a 3PL, you share its staff and processes with other clients. Good providers are very consistent, but custom requests cost extra and changes go through account managers. Quality depends on how clearly you specify the work. A written onboarding pack covering item data, barcodes, packing rules, inserts and service levels prevents most disputes, and the 3PL client onboarding guide covers what that pack should contain.

Visibility is the other half of control. With a 3PL you see your stock through its portal, reports or API, on its schedule. Before signing, ask how quickly receipts and shipments appear, how stock discrepancies are reported and who pays for errors such as a wrong item shipped.

Neither model is better in general. Each fits a different stage and product mix.

A 3PL is usually the better choice when volume is low, unpredictable or strongly seasonal; when nobody on the team has run a warehouse and management time is better spent on product and sales; when you need to reach customers in a new country or region without opening a site; and when products are standard and need no special handling.

In-house fulfillment is usually the better choice when:

• Volume is steady enough to keep a trained team busy all year.
• Products need specialist handling, such as heavy, fragile, high-value or temperature-sensitive goods.
• Orders involve complex kitting and bundles or custom packing that a 3PL would charge extra for.
• Packing and presentation are part of what the customer buys from you.
• You need to change priorities and processes the same day, without going through an account manager.

Moving from a 3PL to in-house often starts when the monthly invoice keeps passing your own break-even estimate, when custom-work fees grow faster than orders, or when errors and slow responses are costing customers. Moving the other way usually follows a lease renewal, a hiring problem, a volume drop or expansion into a market where you have no building.

Either move is a project, not a switch. A typical sequence is to agree an exit date with the current operator, stop sending new inbound stock there, move slow sellers first while fast sellers keep shipping, and count everything as it arrives at the new site. Plan for a period of running both, with stock split between sites, and count everything on both sides of the cut-over.

If you are moving in-house, set up the building before the stock arrives: racking, labeled bin locations, item barcodes and a trained team. The warehouse launch checklist lists the steps in order.

If you outsource all fulfillment to a 3PL, you generally don't need a WMS of your own; your provider runs one. NextStock is for the people running the building. Brands running their own warehouse use it as a single-client operation: the same receiving, picking, packing and counting, without client pickers in the way.

Third-party logistics providers use its multi-client model, where every stock, order and inbound record carries its owner, with warehouse-scoped staff access, API keys and client receipt and dispatch emails. A 3PL client portal and automated storage and handling billing are on the roadmap and not available yet.