Thailand property due diligence: the checklist

Why due diligence matters more here

Thailand has a functioning land registry, a professional Land Department and a court system that enforces property rights. What it does not have is a mandatory disclosure regime, a title insurance market of any depth, or a conveyancing profession with statutory duties to the buyer. In the UK or Australia, a chain of professionals is obliged to surface problems. In Thailand, the burden sits almost entirely on the buyer's side of the table. If your lawyer does not find the encumbrance, the servitude, the unpaid arrears or the quota problem, nobody else in the transaction is required to mention it.

The good news is that the registry is central, searchable and reliable. Nearly everything worth knowing about a property can be established from the Land Office records, the company registry, the juristic office and the physical site. The work is not mysterious. It simply has to be done, in order, by someone who knows what a clean file looks like.

The title search

Every diligence exercise starts at the provincial Land Office where the deed is registered. A proper title search confirms four things: that the deed exists and is of the grade the seller claims, that the person selling is the person registered as owner, that the boundaries and area on the deed match what you have been shown, and that the registered history of the parcel is coherent.

The last point is the one casual searches skip. A back-title review traces the chain of transfers on the deed, typically going back ten to thirty years. You are looking for irregular patterns: rapid flips between related parties, transfers out of estates that may not have been properly administered, upgrades from lower deed grades that could be challenged, and any period where the land passed through a company that has since been dissolved. Our separate briefing on Chanote and the Thai deed hierarchy covers why deed grade matters so much; for diligence purposes, the rule is that anything below Nor Sor 3 Gor should stop the transaction until explained.

Encumbrances and registered rights

The face and back of a Thai title deed record registered burdens: mortgages, usufructs, superficies, habitation rights, leases over three years, and servitudes such as rights of way. All of them survive a sale. A mortgage must be discharged at or before transfer, which is routine, but an overlooked servitude or a registered 30 year lease in favour of a third party is not routine at all, and it does not disappear because the seller forgot to mention it.

• Mortgages and pledges: confirm the payoff figure and that discharge happens simultaneously with transfer at the Land Office.
• Leases and usufructs: any registered right of occupation runs with the land and binds you as the new owner.
• Servitudes: rights of way over the parcel, and equally whether the parcel itself has legal access to a public road. Landlocked plots exist and are worth dramatically less.
• Litigation and seizure flags: check for court orders, execution notices or Legal Execution Department involvement.

Verifying the seller

Identity fraud in Thai property transactions is rare but not theoretical, and messy sellers are far more common than fraudulent ones. For an individual seller, diligence means matching the ID card and house registration against the deed, confirming marital status, and obtaining spousal consent where the property is marital property, because a sale without it can be challenged later. For a corporate seller, it means pulling the company affidavit from the Department of Business Development, confirming the signatory has authority, checking the company is not in liquidation, and reading the shareholder list for signs the company itself was a nominee structure, which can contaminate the asset.

Where the seller holds a power of attorney rather than appearing in person, treat the transaction as higher risk by default. Verify the power of attorney at its source, not from the copy you are handed.

Condominium-specific checks

Condos add a second layer of diligence aimed at the building rather than the unit. Two items are decisive for a foreign buyer.

First, the foreign quota. Foreigners may hold at most 49 percent of the saleable floor area of a condominium building in freehold. Before you commit, the juristic person office must confirm in writing that quota space is available for your purchase; this letter is also required at transfer. A unit marketed to foreigners in a building at quota can only pass to you as a leasehold, which is a different and lesser asset, priced accordingly.

Second, the health of the juristic person itself. Request the building's financial statements, the sinking fund balance, the arrears position and the minutes of the last annual general meeting. A building where a third of owners are not paying common fees, or where the sinking fund cannot cover the coming lift replacement, will show it in these documents years before it shows in the lobby. Also confirm the seller's own account is clear: the juristic office issues a debt-free letter, without which the Land Office will not register the transfer.

Developer diligence for off-plan purchases

Buying off-plan converts property risk into counterparty credit risk, and the diligence changes shape. Beyond the land title under the project, you are examining the developer: its registered capital and financials, its completion track record across previous projects, whether construction financing is in place and from whom, and whether the project holds its Environmental Impact Assessment approval and construction permit rather than merely having applied for them. Escrow is rare in Thailand, so staged payments are usually unsecured advances to the developer. Our separate briefing on off-plan risk covers the contract clauses that matter; at the diligence stage the question is simpler: would you lend this company money unsecured, because that is what you are doing.

Zoning, environment and the EIA

Land that cannot legally support what you intend to build on it is a diligence failure as complete as a bad title. City planning zones under the local comprehensive plan dictate permitted use, building height and density. Coastal and hillside land, particularly in Phuket and Samui, carries additional height and slope restrictions, and projects above certain size thresholds require an approved Environmental Impact Assessment before a construction permit can issue. For a completed property, confirm the building matches its permit; unpermitted extensions are common and become the buyer's problem. For land, obtain written zoning confirmation rather than relying on what neighbouring plots appear to have been allowed to do.

The two-week standard

Run properly, the sequence above takes roughly two weeks for a resale condo and two to four weeks for landed property or anything involving a corporate seller. It can be compressed when a deal genuinely requires it, but be sceptical of any transaction engineered so you have no time to look. Reservation agreements with short fuses and non-refundable deposits are a sales technique, not a market convention you are obliged to respect. A seller with a clean file has nothing to fear from fourteen days.

Diligence findings age. If months pass between the search and the transfer, re-run the title and encumbrance checks on the day of transfer. Registrations can be made in the interim.

How we run it

For clients, AGP coordinates the full sequence through our retained Thai counsel: registry searches, juristic correspondence, developer financials and site verification, delivered as a single written report with a clear proceed or do-not-proceed view. The point is not paperwork for its own sake. It is that our partners only ever transact on files someone senior has actually read.

This briefing is general information, not legal, tax or investment advice. Thai rules change frequently and individual cases differ. Verify current requirements with the relevant authorities, including the Immigration Bureau, the Board of Investment, the Land Department, the Department of Business Development and the Revenue Department, and take advice on your own facts before acting.