Bring four numbers to the decision

1. Likely net proceeds
Expected sale price minus payoff, selling costs, concessions, repairs, and moving costs.
2. Next-home cash need
Down payment, closing costs, reserves, immediate repairs, and moving expenses.
3. Overlap capacity
How many months you can safely carry both homes without relying on a perfect sale.
4. Conservative rental net
Market rent minus vacancy, repairs, management, taxes, insurance, HOA costs, and debt service.

Houston details that can change the answer

Insurance availability and cost, flood-zone and property history, property taxes, HOA leasing rules, commute constraints, option periods, appraisal timing, and leaseback terms can all affect the safest sequence. Review these items for the exact properties—not from a generic rule of thumb.

Use a two-plan test

Build a preferred plan and a fallback. For example: buy first only if financing and reserves remain within your limits; otherwise sell first and negotiate temporary occupancy. A fallback keeps one delay from turning into an emergency decision.