Land Due Diligence in Thailand

Most of what goes wrong with land in Thailand goes wrong before the money moves. The law is not hidden. Nobody read the second copy of the deed.

There are two. One is handed to the owner and the other is kept at the Land Office, and every registration is written into both. The copy handed across a table is the one that can be out of date.

What follows is what a title check works through, and where each rule comes from. Where something is office practice rather than law, it says so.

What is the difference between a Chanote and an NS.3K title, and does it matter?

A Chanote says you own the land. A Nor Sor 3 Kor says the state has certified that you use it. Both can be bought, sold and registered, and the Chanote is the stronger document.

The Land Code defines them separately. A Chanote is the title deed, the document that shows ownership. A Nor Sor 3 Kor is a certificate of utilisation, an official statement that the land has been put to use, and the Code counts a possessory right as a right in land [Land Code B.E. 2497, section 1]. Both carry the owner's name, the location, the area and the boundaries in four directions, both are made in two copies, and both are registered by the same land officers [sections 57 and 71]. A Nor Sor 3 Kor issued with an aerial photo map can later be converted into a Chanote when the Minister opens the district for it [section 58 ter].

The documents the Land Code provides for
Document	What it shows	What follows from it
Chanote (title deed)	Ownership of the land	Registrable. Shows the holder, the location, the area and the boundaries in four directions
Nor Sor 3 Kor (certificate of utilisation)	Official certification that the land has been put to use. A possessory right, which the Code treats as a right in land	Registrable in the same way. Can become a Chanote where issued with an aerial photo map
Bai Jong (pre-emption certificate)	Permission to take temporary possession of allocated state land	A title later issued from it cannot be transferred for ten years, or five where the Bai Jong was issued before 14 December B.E. 2515 with state help

Nor Sor 5 is not on that list. Our verified corpus of Thai legislation returns no document of that name, and papers circulate under it and others, some of them local tax records. The question is never what the paper is called but which of the Code's documents the seller holds [Land Code B.E. 2497, sections 31 and 56].

A property and its boundaries seen from above — Boundaries, access and what is built on the plot

How do I know the land I am buying has legal road access to a public road?

Only if the access is a registered right, or the plot is landlocked and the law gives you a way out. A track you happen to drive on is neither.

Two different things get called access. One is a road people use. The other is a right, and the law creates it in three ways. Where a plot is boxed in by other plots with no way to a public road, the Code lets its owner pass over the surrounding land, building a road if needed, doing as little damage as possible and paying the neighbour for it [Civil and Commercial Code, section 1349]. Where the plot lost its access because a larger plot was split up, the way is claimed over the plots it was split from, and nothing is paid.

The third way is registration. A servitude binds one plot for the benefit of another, and unless the deed says otherwise it passes to whoever buys the land it benefits [sections 1387 and 1393]. Inside a licensed housing development the developer's roads carry that servitude for every plot on the approved plan, and the developer has to maintain them [Land Development Act B.E. 2543, section 43]. Anything short of those three rests on a neighbour's goodwill.

The developer says he owns the land. How do I verify that before I pay?

At the Land Office, by reading its copy of the deed. Then check three things beside the name: marital status, inheritance and subdivision.

The land officers are the people who register rights over land, and anyone registering has to produce the deed for them to examine [Land Code B.E. 2497, sections 71 and 72]. That is where you read it, and that is the copy that counts.

Three things sit alongside the name on the deed. Marital status. Spouses have to act together, or one with the other's written consent, to sell or mortgage property, to create or end a servitude, superficies or usufruct over it, or to lease it for more than three years [Civil and Commercial Code, section 1476]. A sale by one spouse alone can be undone by the court on the other's application, unless the buyer paid and acted in good faith, and within one year of discovery or ten years of the sale [section 1480]. Inherited land. Before an heir is registered, the officials examine the evidence and post public notices for thirty days [Land Code, section 81]. Subdivided land. Where a plot is split or merged, any registration needed is done before the new deed is issued [section 79].

Where the seller is a licensed developer, the sale agreement has to be in the form the Central Land Development Commission prescribes, and any clause outside that form that works against the buyer has no effect [Land Development Act, section 34]. The registering officer has powers of their own too: to question the parties, call for evidence, and where there is reason to think the buyer is buying for a foreigner, refer the matter to the Minister, whose word is final [Land Code, section 74].

Can I build on this plot, or is it in a forest zone?

Check the forest first, then the town plan. Land inside a national reserved forest cannot be occupied or built on, and the town plan decides what can go up on the rest.

Inside a national reserved forest nobody is allowed to occupy, possess, clear, burn or build on the land except in the cases the Act lists. Doing so is a criminal offence, and once a court convicts, it can order the offender and everyone with them off the land [National Reserved Forests Act B.E. 2507, sections 14 and 31]. A deed is not issued over forest, so a plot that turns out to lie inside one has a title problem, not a planning problem.

Then the plan. Where a comprehensive town plan is in force, nobody is allowed to use land in a way the plan does not allow. A use that began before the plan can continue, until the planning committee decides it conflicts with the plan on health, safety or public interest and orders it changed or stopped [Town Planning Act B.E. 2562, section 37].

On Koh Phangan the plan is a ministerial regulation of B.E. 2558. It colours every plot: yellow for low-density housing, green for rural and agricultural land, and a hatched green for forest conservation, which is the permanent forest and the Koh Phangan national reserved forest [Koh Phangan Comprehensive Town Plan B.E. 2558, clause 6]. Each colour has its own list of what is allowed and forbidden, its own cap on building size and height, and tighter caps along the shoreline. Which colour a plot falls in, and the cap that goes with it, is confirmed at the local office against the plan map. That is a look-up at the office.

What rights can already be registered over the land?

Mortgages, leases over three years, usufructs, superficies and servitudes. All of them sit on the Land Office copy of the deed, and every one of them survives your purchase.

A deed with a clean face is not the same thing as land with nothing on it. The Code creates a fixed set of rights in land, each registered on both copies of the deed, and when a Chanote replaces an older document the list of encumbrances is carried onto it [Land Code B.E. 2497, section 59 quarter].

Mortgage: Security for a debt. The lender is paid out of the land ahead of other creditors, even after the land is sold on, and a right registered after the mortgage without the lender's consent ranks behind it [Civil and Commercial Code, sections 702 and 722].
Lease of more than three years: Registered, and it binds you as the new owner for the rest of its term, up to thirty years [sections 538, 540 and 569].
Usufruct: Someone else's right to possess, use and take the income from the land, for a term or for their life [section 1417].
Superficies: Someone else's right to own the buildings on the land [section 1410].
Servitude: A burden on this plot for the benefit of another, such as a right of way, which passes with the land [sections 1387 and 1393].

A right that surfaces after the sale runs in one direction. The seller is liable if you lose the property, or if it turns out to be subject to a right that cuts its value or use, and you did not know about it when you bought [Civil and Commercial Code, section 479]. The seller is not liable for a right you knew about [section 476], and not for a defect you would have found with ordinary care [section 473]. Reading the Land Office copy is what ordinary care means here.

The seller is not liable if the buyer knew of the defect at the time of sale, or would have known of it if he had exercised such care as might be expected from a person of ordinary prudence.
Civil and Commercial Code, section 473

Is the blue book proof that I own my house in Thailand?

No. The blue book records who is registered as living at the address. Ownership of a house comes from a registered right over the land it stands on.

The house registration book is a civil registration record. It is not one of the documents the Land Code provides for, and no right in land is complete until the deal is written and registered at the Land Office [Civil and Commercial Code, section 1299].

Ownership of a building is answered elsewhere. A building put up on someone else's land by a person with a right over that land, such as a superficies, stays that person's property rather than becoming part of the land [section 146]. Without such a right the default runs the other way. Build in good faith on land you do not own and the landowner becomes the owner of the house, paying you only what the house added to the land's value, or making you take it down [section 1310]. A building permit is not a title either. It permits construction, and building differently from the permitted plans is an offence [Building Control Act B.E. 2522, sections 21 and 31].

What this means in practice

A title check is paperwork with a fixed shape, and most of it happens at the Land Office rather than across a table from the seller. The papers to read are these.

The Land Office copy of the deed, read against the seller's copy, and which of the Code's documents it is.
The rights registered on it: mortgages, leases over three years, usufructs, superficies and servitudes.
Any encumbrance carried forward from an earlier document, and any ban on transfer where the title came from a Bai Jong.
The route to a public road: registered servitude, the statutory right of passage, or a road on an approved development plan.
The plot's colour on the town plan, and whether any part of it lies inside a national reserved forest.
The seller's power to sell: marital status and the spouse's written consent, and the succession record where the land was inherited.
Where there is a building, the permit and the drawings it was issued against.

How long each step takes and what an office asks for on the day are office practice, and they vary between provinces. What the law fixes is the effect of registration. A right that is not registered is not complete, and a sale of land that is not registered is void [Civil and Commercial Code, sections 1299 and 456].

A title check has a fixed shape: the register, the plan, the permits, the seller's capacity. If you want that done on a particular plot before money moves, tell us where the land is and what you have been shown.

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Sources Show all 7 sourcesHide sources

Every statement in this article rests on one of the 7 provisions below, each named by Act and section so it can be checked against the legislation itself.

Land Code B.E. 2497, sections 1, 31, 56, 57, 58, 58 ter, 59 quarter, 71, 72, 74, 75, 79, 81, 86, 87 and 96 bis. Definitions of the land documents, what a Title Deed and Certificate of Utilisation contain and that each is made in duplicate, the transfer prohibition attaching to titles derived from a Pre-emption Certificate, exclusion of permanent forest domain from the titling survey, registration of rights and juristic acts, the officer's power of inquiry and referral to the Minister, entry of particulars in both copies, subdivision, succession, and acquisition of land by aliens.
Civil and Commercial Code, sections 146, 456, 473, 476, 479, 538, 540, 702, 714, 722, 1299, 1310, 1349, 1350, 1387, 1390, 1393, 1410, 1411, 1417, 1418, 1476, 1479 and 1480. Component parts and buildings on another person's land, sale and registration of immovable property, the seller's liability for defect and for eviction, hire of immovable property, mortgage, way of necessity, servitude, superficies, usufruct, and management of Sin Somros.
National Reserved Forests Act B.E. 2507, sections 14 and 31. The prohibition on occupying, possessing, exploiting and inhabiting land in a National Reserved Forest, and the penalties and power of eviction.
Town Planning Act B.E. 2562, section 37. Prohibition on using land differently from the comprehensive plan in force.
Koh Phangan Comprehensive Town Plan B.E. 2558 (Ministerial Regulation), clause 6 and its schedule, and clause 10. The colour-coded land types, identification of the forest conservation type as permanent forest and national reserved forest, and the building area, height and shoreline rules in the rural and agricultural type.
Building Control Act B.E. 2522, sections 21 and 31. Permit or notification before construction, alteration or moving of a building, and the prohibition on building differently from the permitted plans and conditions.
Land Development Act B.E. 2543, sections 34 and 43. The prescribed form of an agreement to sell developed land, and the servitude over the public facilities a developer provides.

Section numbers are given so you can check every statement in this article against the legislation itself. Statements about administrative practice are labelled as practice and carry no section number, because there is none. Where a provision exists only in Thai, the section number and the name of the Act are stated so the Thai text can be located.

Common questions

Can a foreigner hold the title deed to Thai land?

Only in narrow cases. A foreigner is allowed to acquire land under a treaty, with the Minister's permission and within limits such as one rai for a home, or by bringing at least 40 million baht of investment into the country and again with the Minister's permission, for up to one rai of residential land. Outside those cases the answer is no, and a company with foreign shareholders holding more than 49 per cent is treated as a foreigner for land.

Does a Nor Sor 3 Kor have to be upgraded to a Chanote before a sale?

No. A Nor Sor 3 Kor is registered by the same land officers in the same way as a Chanote, so it can be sold as it is. Upgrading becomes available when the Minister opens the district for title deeds, which is announced at least thirty days in advance.

Is a road drawn on a survey plan the same as legal access?

No. Legal access is a registered servitude, which passes with the land, or the statutory right of passage that a landlocked plot has over its neighbours, with compensation. A road that is neither of those rests on the neighbour's goodwill.

Does the house registration book prove ownership of the house?

No. It is a civil registration record of who lives at the address. Ownership of land or a right over it is complete only when the deal is written and registered at the Land Office, and the blue book is not one of the Land Code's documents.

What if a registered right surfaces after the transfer?

The seller is liable if you lose the property or it turns out to carry a right that cuts its value or use, and you did not know about it when you bought. The seller is not liable for a right you knew about, or for one you would have found by reading the Land Office copy of the deed with ordinary care.

This article is general information about Thai law, not legal advice, and reading it does not create a lawyer-client relationship. It reflects the legislation as reviewed on 2 September 2026. Thai law and administrative practice change, and practice varies between offices and provinces. For advice on a particular situation, get in touch. See our editorial standards and disclaimer.

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