Thai Property Due Diligence Checklist

Every Thai land plot has a registered file at the provincial Land Office (or the Bangkok district Land Office) where it sits. The title search retrieves the current registered owner, the title type (Chanote, Nor Sor 3 Gor, etc.), the official parcel boundaries, and the history of registered transactions — sales, mortgages, leases, easements — affecting the plot. A Thai property lawyer can request this search on your behalf with a power of attorney. Insist on seeing the official Land Office printout and not just a summary. Cross-check the seller's claimed identity against the registered owner. If there is any discrepancy — different name spellings, recent ownership transfers, multiple sales in a short period — pause and investigate further before proceeding.

Registered mortgages, leases, easements, and other encumbrances all appear on the back of the title deed at the Land Office. A property may have an active mortgage to a Thai bank that must be paid off at completion; the bank's release letter is a critical completion document. Leases that pre-date your purchase remain binding against you as the new owner if they were registered. Watch for easements granting third-party rights of access across the land, for utility wayleaves that restrict where you can build, and for environmental protection notations in some coastal and forest-adjacent areas. Any encumbrance discovered late often kills a deal or requires substantial price renegotiation.

Thailand has a colour-coded national zoning system (the Comprehensive City Plan or 'Pang Muang') administered by the Department of Public Works and Town and Country Planning. Each plot sits within a zone — residential (yellow, orange), commercial (red), agricultural (green), industrial (purple), conservation (white with green) — that constrains what can be built and operated. Check the zoning code for the plot against your intended use. Residential villas, commercial restaurants or hotels, and short-term rental operations each face different rules. Particularly in tourist areas like Phuket and Koh Samui, planning rules around hotels and serviced apartments have tightened in recent years. Confirm with the local municipality if your plans involve anything beyond simple owner-occupation.

For any built property — villa, condo, commercial building — confirm that the building was constructed under a valid permit issued by the relevant municipality (Or Bor Tor or Tessabarn). Ask to see the original construction permit, the as-built drawings, and ideally the certificate of occupancy. Buildings constructed without permits or beyond the permitted footprint can be subject to demolition orders, retroactive fines, or insurance refusal. In rural and island areas, unpermitted construction is unfortunately common, and the buyer inherits the regulatory exposure. A Thai architect or surveyor engaged for the due diligence period can quickly check whether the building on the ground matches the permit on file — a step that has saved many foreign buyers from inheriting demolition risk.

Confirm that the plot has legally registered access — either fronting a public road or with a registered easement across neighbouring land. 'The driveway has been used for decades' is not a legal access right and can be revoked by a new neighbouring owner. For coastal plots, confirm compliance with the setback rules from the high-tide line; for hillside plots, confirm slope and elevation restrictions which have tightened in Phuket. Check utilities: water (mains or well), electricity (PEA or MEA connection with sufficient amperage), drainage, internet (fibre availability), and septic systems. Connection deposits, transformer upgrades, and septic installation can each cost tens of thousands of baht and should be priced into the purchase. Ask neighbours about any chronic flooding, road closures, or noise issues.

Verify the seller's ID against the registered owner. For estate sales (where the registered owner has died), confirm that probate has been completed and the estate administrator is properly appointed. For company-held property, verify the company's shareholder register and recent corporate filings, and confirm that the company is not under any tax or labour dispute. Use a reputable lawyer and pay the deposit into a properly structured escrow or lawyer's trust account — not directly to the seller or broker. Confirm the breakdown of transfer fees, withholding tax, business tax, and stamp duty between buyer and seller before signing the SPA. At completion, attend the Land Office in person if at all possible to witness the transfer registration and collect the original title deed showing your name as new owner.