What should I ask a Phuket developer in writing before paying a reservation deposit?

Before any money moves, get the key facts in writing from the company that will sign your contract: its registration, the project’s approvals, exactly what you are reserving, and when and how the deposit is refunded. Verbal answers from sales staff are not enough.

Reference only; confirm with official documents or the property/landlord in writing.

Check Phuket developers’ DBD records