Overview
The Myth Buyers Are Still Being Sold
For decades, foreigners investing in Thai properties where buildings and land cannot be legally separated have been told the same thing by developers, agents, and even some lawyers: take a 30 + 30 + 30 year lease and you are protected for 90 years.
This structure has never existed under Thai law.
Under Section 540 of the Civil and Commercial Code, a lease cannot exceed 30 years. Pre-agreed automatic renewals beyond that term are not binding on future landowners. Thai Supreme Court decisions have repeatedly confirmed that renewal promises are effectively unenforceable once the original landowner is no longer involved.
This left tens of thousands of foreign buyers relying on a structure that was never legal. Sap Ing Sith was created specifically to close that gap.
What Is Sap Ing Sith?
A Registered Real Right — Not a Promise
Sap Ing Sith (ทรัพย์อิงสิทธิ) translates as Right-Based Property. It is a registrable real right — a right in rem — over immovable property, established by the Sap-Ing-Sith Act B.E. 2562, which came into force in 2019.
Unlike a standard lease, which is a personal contract between two parties under Sections 537–571 of the Civil and Commercial Code, Sap Ing Sith is registered directly on the title deed at the Land Department. This registration means the right attaches to the property itself and remains enforceable against all future owners, creditors, and heirs of the landowner.
Key Distinction
The right does not disappear if the landowner sells the land, dies, or goes bankrupt. It is not a promise between two people — it is a registered encumbrance on the property itself.
Why Was This Law Created?
Foreigners who wanted to invest in properties with buildings on land — as opposed to condominium units, which foreigners can own outright up to 49% of a building — faced only two realistic options before 2019: set up a Thai company to hold the land (carrying serious nominee risk if structured incorrectly), or take a 30-year lease and hope the renewal promises held.
The Thai government passed the Sap-Ing-Sith Act to create a legitimate, registered, long-term property right that did not rely on nominee shareholders and did not depend on unenforceable renewal clauses. It was the legal profession's answer to a problem that had been growing for over 30 years.
Why Adoption Has Been Slow
Despite being available since 2019, Sap Ing Sith adoption has been slow. The primary reason is market conditioning: developers continued selling the 30 + 30 + 30 myth, agents promoted it, and buyers signed because it sounded like 90 years of security at a lower upfront cost.
Only now, as early leases approach their first 30-year mark and buyers discover renewals are not automatically enforceable, are investors asking the critical question: Is there a stronger, properly registered alternative? The answer is Sap Ing Sith.
Key Features
What Sap Ing Sith Gives You
- Legal nature: a registrable real right (in rem), not a personal contract.
- Applies to Chanote-titled land, buildings on land, and condominium units.
- Maximum term: up to 30 years, fixed and registered on the title deed.
- Registered at the Land Department — directly on the title, not as a side agreement.
- Binding on all future owners, heirs, and creditors of the landowner.
- The holder can make alterations or additions to the property without the owner's consent.
- Transferable to a third party by the holder without the landowner's consent.
- Inheritable — passes automatically to statutory heirs.
- Mortgageable — can be used as security for financing.
Why It Is Stronger Than a Standard Lease
- A lease requires the lessor's written consent to transfer (CCC Section 544). Sap Ing Sith does not.
- A lease terminates on the lessee's death (CCC Section 571). Sap Ing Sith is inheritable.
- A lease generally cannot be mortgaged for residential use. Sap Ing Sith can be.
- A lease is a personal contract — if land is sold, protection depends on registration and the new owner's goodwill. Sap Ing Sith is a real right that runs with the property.
- A lease usually forbids alterations without lessor consent (CCC Section 558). Sap Ing Sith allows them.
For foreigners investing in property not split from land — villas, houses, resort units, mixed-use buildings — Sap Ing Sith currently provides the strongest legally registered protection available, short of outright ownership.
Land & Building Investments
The Answer for Villa and House Purchases
Foreigners can own condominium units outright because the building is legally separated from the land under the Condominium Act. When the property is a house, villa, or structure where the building cannot be legally separated from the land, direct foreign ownership is prohibited.
Sap Ing Sith addresses this gap. It gives a foreign investor a registered, enforceable, transferable, inheritable, and mortgageable right over the whole property — land and building — for the full 30-year term. No nominee company. No unenforceable renewal promise.
It applies even to quota-full condominium buildings
Because Sap Ing Sith is not ownership, it can be registered over a condominium unit even when the building has already reached the 49% foreign ownership quota. This opens options that standard foreign freehold purchase cannot.
Common Questions
Can Sap Ing Sith Be Renewed?
Yes, with mutual consent of both parties. At the end of the term, the parties can enter into a new Sap Ing Sith agreement and register it again at the Land Department. This is not an automatic statutory renewal — it is a fresh registration that requires proper structuring from the beginning, with protective pre-agreed clauses in the original agreement.
Does It Cover Both Land and Building?
Yes. Sap Ing Sith is registered over immovable property as a whole, meaning the holder's right covers the land and any buildings or improvements for the full registered term.
Important
Sap Ing Sith must be drafted, negotiated, and registered correctly. The wording on the official Land Department registration determines whether protection is strong or weak. Generic templates and rushed registrations can leave gaps that only appear years later — at exactly the point when the right needs to be enforced.
Key Takeaways
Sap Ing Sith (ทรัพย์อิงสิทธิ) is a registrable real right created by the Sap-Ing-Sith Act B.E. 2562 (2019). It attaches to the title deed and binds all future owners.
The '30 + 30 + 30 year lease' has never existed under Thai law. Thai Supreme Court decisions confirm pre-agreed renewals are unenforceable if the original landowner is no longer involved.
Unlike a standard lease, Sap Ing Sith is freely transferable without owner consent, inheritable by operation of law, and mortgageable.
It applies to Chanote-titled land, buildings on land, and condominium units — including buildings already at the 49% foreign quota, since it is not ownership.
Renewal at term end requires mutual consent and fresh registration. It is not automatic — but it is a fresh agreement, not reliance on an unenforceable clause.
Sap Ing Sith must be correctly drafted and registered at the Land Department. Generic templates and rushed registrations can leave gaps that only appear years later.
Legal Services
We draft and register Sap Ing Sith rights for foreign buyers.
The protection is only as strong as the wording registered at the Land Department. We structure, negotiate and register Sap Ing Sith over land, houses and condominium units.
