The failure mode is almost never the new warehouse. It is the two weeks where inventory is split across both and neither system is the source of truth.
Week 1–2: freeze SKU changes, export a full bin-level inventory snapshot, and agree receiving SLAs in writing with penalties. Week 3: send slow movers first — they are your integration test. Week 4: dual-run with your fastest 10 SKUs still at the incumbent.
Week 5: cut over order routing at a low-volume day of the week, not a Monday. Week 6: reconcile. Expect a 1–3% variance and budget for it rather than fighting it.
Ask every candidate for their receiving-to-live time in hours, measured at the 90th percentile. Averages hide the weeks that will hurt you.
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