Almost every property transaction in Singapore, whether it is an HDB resale flat or a private condo, hinges on a short legal document called the Option to Purchase, or OTP. It is only a page or two long, but it sets the price, the deadlines, and the consequences if either party changes their mind. I have seen deals collapse, deposits get forfeited, and families end up in dispute purely because someone did not fully understand what they were signing. This guide walks through how the OTP works, what the fees actually mean, and where buyers and sellers most often trip up.
What an Option to Purchase Actually Is
An Option to Purchase is a legal offer from the seller to the buyer, giving the buyer the exclusive right to buy the property at an agreed price within a fixed window of time. Once the seller signs it and hands it to the buyer, the seller cannot sell to anyone else during that window. The buyer, on the other hand, is not yet obligated to buy. They have paid a small sum to hold that right, but the deal is not locked in until they formally exercise the option.
This is the part many first-time buyers misunderstand. Signing the OTP as a buyer does not mean the sale is confirmed. It means you have secured the right to confirm it later, within the option period. That distinction matters because it changes what each side can and cannot do while the clock is running, and it explains why the fees involved are structured the way they are.
Option Fee and Exercise Fee: Two Different Things
The option fee is what the buyer pays the seller to obtain the OTP in the first place. For HDB resale flats this is typically a nominal amount, often around one dollar, though in practice it can be a small negotiated sum. For private property, the option fee is usually around one percent of the purchase price, paid in cash. This fee is not refundable if the buyer decides not to proceed, because it compensates the seller for taking the property off the market during the option period.
The exercise fee is different. This is paid when the buyer decides to go ahead and formally exercises the option, usually bringing the total deposit paid up to five percent for private property. Once exercised, the OTP becomes a binding contract for sale and purchase, and both parties are now committed. This is the point of no return. Before exercise, a buyer walking away loses only the option fee. After exercise, walking away can mean losing the full exercise deposit and potentially facing further claims from the seller.
For HDB resale transactions, the process is slightly different because HLE or bank loan approval and the resale application timeline are built around the OTP dates set by HDB rules. The option period for HDB resale is typically capped by HDB guidelines, whereas private property option periods are negotiated between buyer and seller, commonly two to three weeks.
HDB Resale OTP Versus Private Property OTP
HDB resale OTPs are governed by a fairly standard framework because the sale must ultimately be registered through the HDB resale portal. Once the OTP is exercised, both parties submit the resale application, and HDB then sets a completion timeline of around eight to ten weeks, giving time for valuation, loan approval, and the various eligibility checks HDB requires, such as ethnic integration policy quotas or ownership of other property.
Private property OTPs give both sides more room to negotiate the specifics. Sellers sometimes ask for a shorter option period if there is strong interest, while buyers who need more time to secure financing may ask for a longer one. The completion period after exercise is usually eight to twelve weeks for a resale private property, and this is where in-principle approval from your bank, done before you even view units, becomes valuable. Walking into an OTP negotiation without financing lined up puts you at a real disadvantage.
One thing that catches people off guard is that once an OTP is granted, even before it is exercised, the seller genuinely cannot entertain other offers, even a higher one. If a better offer comes in during your option period, the seller has to wait for your decision or your option to lapse before considering it. This works both ways, so buyers should treat the option period as a serious commitment window, not a casual holding pattern.
Where Buyers and Sellers Commonly Go Wrong
The most frequent issue I encounter is buyers exercising the option before their loan is fully sorted out, assuming approval will simply follow. In-principle approval is not the same as final bank approval, and a change in the buyer’s financial situation, or a lower than expected valuation, can create a shortfall between what the bank will lend and what is needed. Sorting out financing structure, including how much CPF and cash will be used, before exercising the option avoids a scramble later.
On the seller’s side, a common mistake is granting an OTP without fully reading the conditions attached, particularly around vacant possession dates or inclusion of fittings and furniture. Verbal agreements made during viewing do not carry weight once the OTP is signed. If something was promised, such as leaving behind certain built-in wardrobes or air-conditioning units, it needs to be stated in the OTP itself.
Another area of confusion is what happens with co-owners. If a property is jointly owned, all owners typically need to be party to the OTP, and if one owner is overseas or unavailable, this can delay signing considerably. Families going through this together should sort out signing logistics before the option period even starts, since the clock does not pause for administrative delays.
What Happens If Timelines Are Missed
If a buyer does not exercise the option within the stipulated period, the option simply lapses, and the seller keeps the option fee while being free to sell to someone else. There is usually no further penalty beyond the loss of that initial fee, which is one reason the option fee is deliberately kept low for HDB flats and moderate for private property.
Once exercised, though, missing subsequent deadlines, such as completion dates for the sale and purchase, can trigger late completion interest or, in serious cases, forfeiture of the deposit if the buyer is unable to complete at all. This is where legal advice from your conveyancing lawyer earns its keep. Most standard OTPs have built-in extension clauses subject to interest, but these should be understood upfront rather than discovered under pressure.
Getting the Sequence Right Before You Sign
My advice to both buyers and sellers is the same: treat the OTP stage as the most important few weeks of the entire transaction, not a formality to rush through. For buyers, that means having financing pre-approved, understanding your CPF usage, and reading every clause before paying the option fee. For sellers, it means being clear on your own next steps, whether that is a purchase to move into or a rental arrangement, before you commit to a completion date that may not give you enough runway.
For families who are upgrading, timing the OTP on the sale side against the OTP on the purchase side is often the trickiest part of the whole move, and it is where a coordinated plan matters more than any individual document.
If you are approaching an OTP, whether as a buyer, a seller, or a family trying to line up a sale and purchase at the same time, it is worth having someone walk through the specific clauses and timelines with you before you sign anything. Feel free to reach out to me on WhatsApp or drop me a message, no pressure at all, just a conversation about what your situation actually needs.