Adverse possession on Koh Phangan: how a squatter can legally acquire your unused land

Can someone else legally take ownership of land you own just by occupying it? Yes — under Civil and Commercial Code Section 1382, a person who possesses another's Chanote-titled land openly, peacefully and with the intent to own it, for an uninterrupted 10 years, can go to court and be registered as the new owner. It doesn't require the possessor to have paid anything, or to have honestly believed the land was theirs — only open, continuous, unchallenged possession. On Koh Phangan, where many foreign-linked buyers hold undeveloped hillside or interior plots through a lease, company or usufruct structure and visit only occasionally, this is a real and underappreciated risk, not a theoretical one.

The four elements a court looks for

• Registered title (Chanote) — Thai law firms are consistent that the 10-year clock runs against Chanote-titled land. Weaker or unregistered documents like Sor Kor 1 or the possessory papers flagged in Untitled 'sea-view land' scams follow a different, faster dispute rule instead (Section 1375, roughly a one-year window to sue after being dispossessed) — not this 10-year ownership-transfer mechanism. See also Chanote vs Nor Sor 3 on title strength generally.
• Open and peaceful possession — fencing, building, cultivating or otherwise visibly using the land, not sneaking onto it or taking it by force or threat.
• Uninterrupted for 10 years — a possessor who involuntarily loses possession but recovers it, or files suit, within one year keeps the clock running (Section 1384); it doesn't require continuous residence, just continuous, unbroken possession.
• Intent to own, not permission — a caretaker, tenant, or someone the owner allowed to farm the land doesn't qualify, since they possess on the owner's behalf, not against it.

How it actually plays out

Meeting those four elements doesn't transfer ownership automatically. The possessor has to petition a Thai court for an order recognizing the acquisition; the court summons the registered owner to contest the claim and typically orders a land survey; only after a favorable, unopposed or upheld ruling can the possessor take that order to the Land Office to register the change. In practice, an owner who is notified of the case — or who simply visits often enough to notice an encroachment early — can very often defeat the claim by producing the registered title. The real danger is not contesting it, because you never found out.

Why this specifically bites absentee owners

• Foreigners cannot themselves gain Thai land this way — the Land Code's ban on direct foreign land ownership isn't sidestepped by adverse possession — but the risk runs the other direction: a foreign-linked landowner, holding personally, via a 30-year lease, a company or a usufruct, can still lose the underlying land to a Thai possessor who occupies it.
• Undeveloped hillside and interior plots are the highest-risk profile — exactly the land bought as a long-term hold or future-build site and then left unvisited for years, common in Phangan's outer districts.
• Paying land tax in your own name, keeping dated photos of a fenced or marked boundary, and visiting or having an agent inspect the plot at least once a year are the cheapest practical defenses — they build a documented record that possession was never left uncontested.

None of this makes raw land a bad investment — it makes an empty, unfenced plot a maintenance item, not a set-and-forget asset. If you're buying vacant land specifically to hold rather than build on right away, ask your lawyer to fold periodic site inspections and boundary marking into the same routine covered in Due diligence before buying on Koh Phangan.