Due diligence is the process of independently verifying every material fact about a property before you commit to buying it. In Thailand, where property law is complex and documentation can be inconsistent, thorough due diligence is not optional — it is the single most important thing you can do to protect your investment.
Step 1: Verify the Title Deed at the Land Department
Thailand has several types of land title documents, and they are not equal. The most secure is the Chanote (NS-4) — a fully surveyed title with GPS-accurate boundaries. Below it are Nor Sor 3 Gor (NS-3K), Nor Sor 3 (NS-3), and various possession documents (SPK, SK) that carry progressively less security.
For any condominium purchase, the title deed is the condominium unit title (อช.2). Always verify the title directly at the local Land Department — do not rely on a copy provided by the developer or agent. Verification takes about 30 minutes and costs a nominal fee. A licensed Thai lawyer can accompany you or do this on your behalf.
Step 2: Check for Encumbrances and Mortgages
A title search at the Land Department will reveal any registered mortgages, liens, rights of way, or other encumbrances on the property. If a developer has taken a construction loan secured against the land or units, that mortgage must be discharged at or before transfer. Never transfer title without confirming the property is free of encumbrances — or that the encumbrance will be discharged simultaneously on transfer day.
Step 3: Verify Foreign Quota for Condominiums
The juristic person's office (นิติบุคคลอาคารชุด) maintains a register of the condominium's foreign and Thai ownership breakdown. Request a certified letter confirming that the foreign quota is available. This letter should state the total foreign-owned area, total sellable area, and the percentage currently occupied by foreign owners. Without this confirmation in writing, do not proceed.
Step 4: Review the Sale and Purchase Agreement
The Sale and Purchase Agreement (SPA) is the most important document in the transaction. Your lawyer must review it before you sign — not after. Key clauses to scrutinise include: completion date and delay penalties, defect liability period, payment schedule and default provisions, developer's obligations on title transfer, and what happens if the foreign quota is unavailable on completion.
Step 5: Confirm the FET Requirement
Foreign buyers must remit purchase funds in foreign currency from overseas and obtain a Foreign Exchange Transaction (FET) form — also called a Thor Tor 3 (ทต.3) form — from the receiving Thai bank. This document is mandatory to register the property in a foreign name and to repatriate proceeds when you sell. Ensure your bank issues this form for every transfer, and keep all FET forms permanently.
Step 6: Inspect the Physical Property
Legal due diligence alone is not sufficient. Conduct a physical inspection with a qualified building inspector if possible. Look for structural defects, water damage, mould, electrical issues, and any encroachments on neighbouring land. For off-plan purchases, inspect the developer's other completed projects to assess build quality.
Due Diligence Checklist
- ✅ Title deed verified at Land Department — type confirmed as Chanote or NS-3K
- ✅ No mortgages or encumbrances on title (or discharge confirmed for transfer day)
- ✅ Foreign quota availability confirmed in writing from juristic office
- ✅ SPA reviewed by independent Thai lawyer before signing
- ✅ FET/Thor Tor 3 forms obtained for all remitted funds
- ✅ Physical inspection completed
- ✅ Developer's track record verified (for off-plan or new build)
Due diligence done properly takes time and costs money — but it costs far less than discovering a problem after you have transferred title. In Thailand's property market, patience and diligence are your most valuable tools.