A reservation agreement is usually the first document a buyer signs when purchasing property on Koh Samui, and it is also the one most often skimmed. It typically arrives at an exciting moment, after a price has been agreed and before lawyers are properly involved, and it is frequently presented as a formality that simply takes the property off the market. It is not a formality. It commits money, sets deadlines, and in many cases determines whether a buyer can walk away later without loss.
This guide covers what a reservation agreement does, what signing one commits you to, and the specific clauses worth checking before you sign. It deliberately stops short of ownership structures, title deeds, and closing costs, which are separate subjects with their own considerations.
What Is a Property Reservation Agreement?
A reservation agreement is a short pre-contract document under which a buyer pays a deposit in exchange for the seller taking the property off the market for a defined period. It is sometimes called a booking agreement, a reservation form, or a holding deposit agreement, and on Koh Samui the terminology varies between resale agents and developers selling off-plan units.
Its purpose is narrow. It secures a short window during which the buyer completes due diligence and the parties negotiate the full sale-and-purchase agreement. It is not the contract that transfers the property, and it is not intended to contain the full commercial terms of the sale. What it does contain, almost always, is a deposit and a deadline.
The length of the document is a poor guide to its significance. A one-page reservation agreement can still create a binding obligation to forfeit a substantial sum, which is why its brevity should not be read as informality.
Where It Sits in the Koh Samui Buying Timeline
The typical sequence runs: viewing, verbal agreement on price, reservation agreement and deposit, due diligence, sale-and-purchase agreement, then transfer at the Land Office. The reservation agreement therefore occupies the gap between an informal agreement and a formal one.
That position is what makes it consequential. At the point of signing, the buyer has usually not yet seen the title documents, not yet confirmed the seller’s authority to sell, and not yet had a lawyer review anything. The reservation agreement is signed at the moment of least information and greatest enthusiasm.
Buyers coming from markets where a holding deposit is fully refundable as a matter of course should be particularly careful here, because that assumption does not transfer automatically to a Thai transaction.
What Signing One Actually Commits You To
In practice a reservation agreement usually commits the buyer to three things. The first is payment of the reservation deposit, generally on signing or within a few days. The second is a timetable, meaning the buyer agrees to sign the sale-and-purchase agreement by a stated date. The third, and the one that causes the most difficulty, is the consequence of not meeting that timetable.
The seller’s obligations are usually lighter. The seller agrees not to market or sell the property to anyone else during the reservation period, and sometimes agrees to provide documents for due diligence. Whether the seller faces any penalty for breaching that exclusivity is a separate question, and often the answer in the drafting is no.
This asymmetry is normal rather than sinister, but it is worth recognising before signing. The buyer is typically the only party with money at risk during the reservation period.
How Much Is the Reservation Deposit, and Who Holds It?
Reservation deposits on Koh Samui vary considerably by property type and price bracket. Smaller amounts are common on resale condominiums, while villas and off-plan purchases often attract larger sums, sometimes expressed as a percentage of the purchase price rather than a fixed figure.
The more important question is who holds the money. The deposit may be held by the seller directly, by the agent, or by a lawyer. Each arrangement carries a different practical risk if the transaction later falls apart and a refund becomes due, because recovering money from a party who has already spent it is a different problem from recovering money sitting in a holding account.
If the agreement does not say who holds the deposit, that is itself worth resolving before signing rather than after. A document that is silent on custody is also usually silent on the mechanics of returning the money.
Is the Reservation Deposit Refundable?
This is the single most important clause in the document, and the honest answer is that it depends entirely on what the agreement says. There is no default position that makes a reservation deposit automatically refundable, so the protection a buyer has is the protection written into the document.
Reservation agreements commonly fall into three categories. Some are fully refundable if the buyer does not proceed for any reason. Some are refundable only in defined circumstances, typically where due diligence reveals a problem with the title or the seller’s authority. Others are expressly non-refundable, meaning the buyer forfeits the deposit by not completing, regardless of the reason.
A buyer should know which of those three they are signing before they transfer any money. Where the drafting is ambiguous, the ambiguity tends to be resolved in favour of whoever is holding the funds.
What the Exclusivity Period Buys You, and How Long It Should Run
The reservation period is the window during which the seller agrees not to sell to anyone else. Its length matters because it has to be long enough to complete meaningful due diligence and negotiate the sale-and-purchase agreement.
A period that is too short creates pressure in exactly the wrong direction. If due diligence is incomplete when the deadline arrives, the buyer faces a choice between proceeding without full information and losing the deposit, which is the position the reservation agreement was supposed to protect against.
It is reasonable to ask for a longer period where the property is likely to raise more complex questions, such as land with access or boundary issues, or a villa where the structures and the land have different documentation. It is also reasonable to ask for a mechanism to extend the period if a specific document is delayed, which is a common and practical cause of overrun.
What Should Happen If Due Diligence Fails
The purpose of the reservation period is to allow checks to be made, so the agreement should state plainly what happens if those checks produce a problem. Without that, a buyer can find they have paid for the right to discover a defect while remaining contractually obliged to proceed or forfeit.
A well-drafted clause ties the refund to the outcome of due diligence in objective terms. That means defining what counts as a failure, such as an encumbrance on the title, a discrepancy in the land measurement, a seller who cannot demonstrate authority to sell, or an absence of required permits. It also means stating who decides, and within what timeframe the deposit is returned.
Clauses that make a refund conditional on the seller’s agreement are substantially weaker than they first appear, because they convert a contractual right into a negotiation.
Clauses to Check Before You Sign
The following are the provisions worth reading closely, and if necessary renegotiating, before any money moves.
Refund conditions
Confirm precisely when the deposit is returned and when it is forfeited. Vague language such as reasonable circumstances or mutual agreement should be replaced with specific triggers.
Deadlines and extensions
Check the date by which the sale-and-purchase agreement must be signed, and whether the period can be extended if a document is delayed through no fault of the buyer.
Who holds the deposit
Establish the holder and, where possible, prefer a neutral party over the seller. Confirm how a refund would physically be made and in what currency.
Failure to complete
Look at what happens if the seller is the party who does not proceed. Many agreements are silent on this, which leaves the buyer with little recourse beyond recovering the deposit itself.
Conversion terms
Confirm that the deposit counts towards the purchase price rather than sitting alongside it as an additional fee, and that the headline commercial terms in the reservation agreement carry through to the sale-and-purchase agreement.
Governing language
Where the agreement exists in both Thai and English, establish which version prevails in the event of a discrepancy. This is routinely overlooked and occasionally decisive.
Risk Points Specific to Koh Samui
Several features of the local market make the reservation stage more consequential here than it might be elsewhere.
Resale villa transactions frequently involve land and structures with separate histories, so due diligence can take longer than a standard reservation period assumes. Access arrangements are a recurring issue on hillside plots, where a right of way may be informal rather than registered, and establishing the position takes time.
Off-plan purchases introduce a different set of questions, because the reservation is for something that does not yet exist. Here the reservation agreement should connect to the construction timetable and the payment schedule, and the consequences of developer delay deserve attention before signing rather than after.
Overseas buyers face a practical constraint as well, since signing, transferring funds, and returning documents across time zones all consume part of a reservation period that was often set with a local buyer in mind. Due diligence checks typically need to fit inside that same window.
How the Reservation Agreement Becomes the SPA
The reservation agreement is designed to be superseded. Once due diligence is complete and terms are agreed, the parties sign the sale-and-purchase agreement, which contains the full commercial and legal terms and governs the transaction from that point.
Two things should carry across cleanly. The deposit should be credited against the purchase price, and the commercial terms agreed at reservation stage should appear unchanged in the sale-and-purchase agreement. Where a figure or a condition has quietly moved between the two documents, that is worth raising before signing rather than treating as a drafting detail.
The reservation agreement normally ceases to have effect once the sale-and-purchase agreement is signed, but it is sensible to confirm that the later document says so, rather than leaving two agreements running in parallel with potentially inconsistent terms.
Conclusion
A reservation agreement is a small document that allocates real risk. It decides whether a deposit is recoverable, how long a buyer has to investigate what they are buying, and what happens if that investigation turns up a problem. Reading it carefully takes a fraction of the time that recovering a forfeited deposit would, and it is the cheapest point in the transaction at which to improve your position.
The practical advice is simple. Do not treat the reservation agreement as paperwork that precedes the real contract. Treat it as the first real contract, because in terms of money at risk, it often is. If you would like a reservation agreement reviewed before you sign, get in touch.
Frequently Asked Questions
Is a reservation deposit refundable in Thailand?
Only if the agreement says so. There is no automatic right to a refund, so refundability depends entirely on the clauses in the document, which may make the deposit fully refundable, refundable only if due diligence fails, or non-refundable in all circumstances.
How long should a reservation period last?
Long enough to complete due diligence and negotiate the sale-and-purchase agreement without pressure. Where a property is likely to raise more complex questions, such as land with access or boundary issues, it is reasonable to ask for a longer period or a mechanism to extend it.
Is a reservation agreement legally binding?
Generally yes, within its limited scope. It does not transfer the property, but the obligations it does contain, particularly around the deposit and the timetable, are usually enforceable, which is why its brevity should not be mistaken for informality.
Who should hold the reservation deposit?
A neutral party is preferable to the seller holding the funds directly, because recovering money that has already been spent is a materially different problem from recovering money held in a holding account. The agreement should state clearly who holds it and how a refund would be made.
Does the reservation deposit count towards the purchase price?
It usually does, but this should be confirmed in writing rather than assumed. Check that the agreement credits the deposit against the price rather than treating it as a separate fee payable in addition to it.
