Prioritize facility layout and storage density, WMS capability and integration, SLA metrics (OTIF, order accuracy), capacity flexibility, workforce skillsets, security and compliance, and available value-added services (kitting, returns management). Verify carrier access and seasonal throughput performance to confirm scalability.

Review the 3PL’s lane performance data, transit time maps, and carrier contracts. Verify proximity to major highways, port terminals, and intermodal yards. Request sample routing guides, average dray times, carrier mix, and MAP/zone pricing data to model transit windows and landed-cost impacts.

Compare receiving, storage (per pallet/cubic/sku), pick & pack, fulfillment transaction fees, kitting, returns processing, fuel surcharges, accessorials, minimum monthly charges, IT/EDI fees, inventory reconciliation charges, and contract termination terms. Model a 12-month cost with expected volume seasonality.

SLAs define measurable outcomes (order accuracy, lead times, cut-off times, claims). Technology integration (API/EDI, real-time inventory, event notifications) enables visibility, reduces manual exceptions, and improves routing decisions. Confirm escalation processes, data ownership, and testing timelines before go-live.

Balance proximity to customers and ports against land and labor costs. Centralized hubs lower inventory duplication but can increase last-mile costs; multi-node networks reduce transit times but raise inventory carrying. Consider carrier density, seasonal demand, labor availability, and expansion options in site selection analyses.