"A 90-year lease is as good as owning." That single sentence sold thousands of villas across Thailand. Buyers signed a 30-year lease bundled with two renewals agreed in advance, 30 plus 30 plus 30, and called it ownership in disguise, a virtual freehold. In March 2025, Thailand's Supreme Court ended the illusion, and for the honest investor that ruling is good news, because it killed a mirage and rewarded transparent structures.
This 18-part THEVA dossier works through the facts one at a time, statute in hand. After superficies and usufruct, this article takes on the question that worries buyers most, duration. How long does a foreigner really keep the land, and what is a renewal promise actually worth?
Article 14 of 18: what the law actually says about lease duration and renewal, why the 90-year lease is a myth, and what really protects your villa over time.
Source: Thai Civil and Commercial Code, sections 538, 540 and 569, and Supreme Court judgment No. 4655/2566.
The 90-Year Myth
For two decades, one structure became the standard. A registered 30-year lease, the legal maximum, topped up with a written promise to renew it twice, reaching 60, 90, sometimes 99 years. Sellers presented this as the equivalent of ownership, since the foreigner appeared to lock in use of the land for three generations. The pitch was simple and reassuring, which is exactly what made it a universal sales argument.
The weakness sat where few buyers looked. A renewal promise signed today for thirty or sixty years from now does not carry the strength it was assumed to have. It eventually collided with the statute.
What the Law Actually Says
The starting rule fits in one line. Section 540 of the Civil Code caps the term of a property lease at thirty years. Anything longer is automatically reduced to thirty. The text allows a lease to be renewed, but each renewal is itself limited to thirty years from its own date.
In March 2025, the Supreme Court ruled on pre-agreed renewals in judgment 4655/2566. Its conclusion was clean. A clause that sets out, from the day of signing, automatic renewals designed to exceed thirty years is void, because it circumvents Section 540. The Court declined to treat it as a personal right enforceable between the parties. It noted that the promise carried the same rent and the same original conditions for the entire span, which exposed a single long lease dressed up as renewals.
Two consequences follow, and both matter. First, a renewal promise is not a real right. It binds only the original lessor, and does not carry over to their heirs or to a new owner of the land. Second, renewal requires a fresh agreement, genuinely re-agreed and re-registered at term, not a box ticked thirty years earlier. If the original lessor breaks the promise, the remedy is compensation, not a renewal forced through.
Renew Without Limit, Lock 90 Years in Advance No
Does this mean a foreigner is stuck with thirty years, then out? Not at all, and this is the other half of the myth, the part least understood. The law places no cap on the number of renewals. The thirty-year ceiling applies to each registration, not to the total life of a relationship. Nothing stops a lease from being renewed at term, then renewed again at the next term, with no limit on how many times.
The distinction carries weight. A lease relationship can run 60, 90 or 120 years, provided it rests on successive renewals genuinely re-agreed at each term, rather than on a 90-year block locked in on day one. The myth stated two false things at once, that you were fixed at thirty years forever, and that you could escape that by signing 90 years in advance. Reality sits between the two, a renewal that repeats, but that is built over time, cleanly.
The Renewal Priority
A fair question remains. If renewal is not guaranteed in advance, what protects the occupant when the time comes? Part of the answer sits in a renewal priority clause, a contractual right by which the landowner commits to offering renewal first to the villa owner, ahead of any third party. In practice, the lessor cannot hand that renewal to someone else who turns up, even at a higher offer, without first honoring that priority.
Its reach needs stating precisely, to avoid slipping back into the myth. This priority binds the lessor who signed it, and a breach opens a right to compensation. It is not a real right that would force a future buyer of the land to renew. Its real strength comes less from the clause alone than from the identity of the lessor. When the landowner is a stable entity aligned with the project, the scenario of a hostile lessor refusing in order to sell to the highest bidder does not arise. This is where structure counts for more than the promise.
Rent Cannot Run Away
A second classic worry, the renewal rent. What happens if, after thirty years, the owner demands ten times the original figure? Here again, protection comes not from a public rent-control authority, which does not exist for private leases, but from an indexation clause written into the contract. The renewal rent is tied to an objective benchmark, the official cadastral value, reassessed by the State at regular intervals. Rent then rises at a predictable pace, framed by the State schedule, not at the lessor's discretion.
This mechanism avoids two traps at once. Freezing the rent at the same figure for 90 years would push the whole arrangement toward requalification as a disguised lease, precisely one of the elements the Court relied on. At the other extreme, leaving the rent to an undefined future negotiation would make the clause unenforceable, a mere agreement to agree later. A determinable formula, anchored to a public index, is the solid middle ground between those two errors.
Why This Combination Is a Strength
Here is the point that changes how the whole structure reads. At first glance, two elements pass for weaknesses: that renewal is only a priority rather than an automatic guarantee, and that the rent rises with the cadastral value. These are in fact the two things that make the structure sound in law, and the 2025 judgment proves it in reverse.
What the Court struck down was an automatic renewal locked in advance, at a rent frozen identically for ninety years. Together, those two traits exposed a single disguised lease, not real renewals. The combination described here is the exact mirror image. Renewal is genuinely re-agreed at each term instead of being pre-set, and the rent adjusts to real current value through the State schedule instead of staying fixed. Each renewal is therefore a new transaction, at the price of the day, not the continuation of a deal locked at the start. Far from weakening the arrangement, indexed rent and non-guaranteed priority are the very proof that this is an authentic renewal, the kind the law recognizes, and not a disguised workaround.
"The pre-locked 90-year lease is a myth the courts have buried. What actually protects you is a repeatable renewal, a contractual priority, a rent indexed to a State schedule, and a villa that stays yours whatever happens."
What This Changes for the Foreign Investor
The 2025 judgment brought down the fake 90-year leases. The model THEVA defends does not depend on them, and that is exactly what makes it sound. It promises no magic number, it stacks real protections.
First, structural alignment. The land belongs to a genuinely Thai entity, and that same entity is the lessor. The owner of the ground and the developer are not two opposing interests, but one. The scenario buyers fear, a third-party lessor refusing to renew in order to reclaim the land, does not exist in this configuration. Then the villa itself. It is owned through a superficies right registered on title, separate from the land. Even in the extreme case of non-renewal, the villa does not fall to the landowner, its value remains owed to the villa owner. Added to this are the renewal priority and its compensation remedy, the rent indexed to cadastral value, and a buy-back at a defined value should the owner choose not to renew, which we cover in a dedicated article.
The core question stands simply. How long do you keep your villa? For as long as you renew, with no limit on the count, from a lessor aligned with the project. And the day you stop? You leave with the value of your villa, not empty-handed. That is the exact inverse of the myth, which promised much on paper and collapsed at first examination. Here, less magic is promised and far more solidity delivered.
Final Thoughts
The 90-year myth reassured buyers for years, until legal reality caught up with it. Its fall is not bad news, it is a clean-up. The courts removed from the market an illusion that exposed thousands of buyers to a harsh wake-up at year thirty.
For the serious investor, that is one more protection. A market that refuses fake 90-year leases is a market where duration is built on solid ground, real renewals, a villa you own, a rent held to a schedule, a controlled exit. Those who sold hot air are pushed out, those who build cleanly are rewarded.
The duration of a villa is built on protections that hold on the day you need them. Locking 90 years on paper was never one of those protections.
