When the company hands you a lump sum and a start date, the move becomes yours to manage. The tools that protect you: a binding estimate, a delivery window in writing, and a storage buffer if the housing isn't ready.
The short version: treat a lump-sum relocation as a normal interstate move with one extra constraint — the start date. That pushes three things to the top: a binding estimate after a survey, a delivery window in writing with the slip terms stated, and storage-in-transit priced up front in case the destination isn't ready. Keep every document for the reimbursement.