3PL Fulfillment vs. In-House Warehouse — A 7-Point Comparison
"Should we run our own warehouse, or hand it over to a 3PL?"
It's the decision e-commerce owners and D2C brands run into most often. Here are the seven decision criteria RUNIC has distilled from operating clients of every size out of K-One Gimpo Logis.
At a Glance
1. Upfront Investment (CAPEX)
An in-house warehouse means a deposit, rent, racking, forklifts, a barcode system, and a WMS rollout — an upfront investment running from tens of thousands to millions of dollars. A 3PL takes all of that to zero: you pay only a per-order rate. For new businesses, or any brand that would rather not lock up capital, a 3PL is the clear answer.
2. Variable vs. Fixed Costs
An in-house warehouse is a fixed-cost structure. Rent and payroll keep going out even in the off-season. A 3PL bills per order shipped and per unit of storage space, so it runs as a variable cost that scales with your sales. For categories with strong seasonality — fashion, food, seasonal goods — a 3PL is overwhelmingly the better fit.
3. Staffing
With an in-house warehouse, you handle hiring, training, attendance, the four major insurances, and severance yourself. During peak shipping season, sourcing temporary labor is its own headache. A 3PL entrusts the work to an operation that already has the labor pool in place, so HR and labor risk disappears. RUNIC keeps a seasoned operations team on hand at its Gimpo center year-round, holding shipping accuracy steady even through seasonal swings.
4. Systems & WMS
Running your own operation means a WMS on a monthly SaaS subscription or building one yourself. Channel-by-channel API integrations (SmartStore, Coupang, Cafe24, Shopify, and the like) take time. A 3PL usually runs its own WMS, so that burden is off your plate. RUNIC develops and operates its own WMS, TMS, and admin dashboard in-house, which means client channel integrations go live fast.
5. Space Scalability
An in-house warehouse is locked into a lease, so even as volume grows, expanding on the spot is hard. And if volume drops, you eat the cost of the empty space anyway. A 3PL scales storage space up and down by the unit, flexing to match your growth curve.
6. Transport Connectivity
If you only ship out of your own warehouse and then line up an outside carrier separately, end-to-end visibility suffers and accountability gets scattered. Among 3PLs, choosing one with a built-in transport network lets you handle everything — dispatch, delivery, and settlement — through a single partner.
RUNIC runs its own freight brokerage, so 3PL dispatch and nationwide delivery connect instantly over one network. No separate carrier to arrange — a single point of contact owns it end to end.
7. Shipping Accuracy & SLA
In an in-house warehouse, shipping accuracy swings with how skilled the workers are. A well-run 3PL holds shipping accuracy in the 99.9% range through automated inspection and standard operating procedures. Returns, repackaging, and QC processes are handled by a dedicated team.
Decision Flow
- Under 100 orders / month, simple shipping → handle it yourself or start with a small 3PL
- 100–20,000 orders / month, variable and multi-channel → 3PL fulfillment strongly recommended
- Over 20,000 orders / month, steady volume → consider a hybrid of in-house warehouse and 3PL
- Rising share of overseas shipments → a 3PL that combines international express and forwarding is the way to go
How RUNIC Sees the Value of Integrated Operations
RUNIC runs 3PL fulfillment, freight brokerage, international express, forwarding, and its own WMS from one team. Because the work is connected through a single operating system rather than split across outside vendors, you get the control of running your own warehouse and the flexibility of a 3PL at the same time. Across roughly 3,000 pyeong (about 9,900 m²) of operating space on the fourth floor of K-One Gimpo Logis — with direct 25-ton wing-body berthing and rooftop parking — RUNIC pushes inbound and outbound efficiency to the maximum.
Official site www.runic.kr · About RUNIC · 3PL Cost Structure →