An Option to Purchase (OTP) gives you a deadline to decide, not extra time to find money after committing. Before paying for one, identify the transaction: an HDB resale flat, a private resale home, or an uncompleted home sold by a licensed developer. Their deposits, forms and exercise rules differ.
This guide explains the decision before exercise. For the money calculation, use our OTP cash-budget worksheet. Once a private resale option is exercised, follow the completion checklist. Checked on 18 September 2026.
Start with the right transaction
| Purchase | What controls your next step |
|---|---|
| HDB resale flat | The HDB-prescribed OTP. The option fee is S$1 to S$1,000; the option fee plus exercise fee cannot exceed S$5,000. |
| Private resale home | Your negotiated contract. Read the actual deposit, expiry time and delivery instructions. A two-week option is a common template provision, not a universal deadline. |
| Uncompleted home from a licensed developer | The regulated developer OTP and sale agreement. The exercise clock runs from delivery of the agreement and title documents, not simply from booking. |
A BTO purchase is a separate process. Executive condominiums also require their own eligibility checks. Neither should be assumed to follow every rule for an ordinary private resale condo.
HDB resale: the full 21-day option period
Under HDB’s OTP procedure, buyers should have a valid HDB Flat Eligibility (HFE) letter before obtaining an OTP. The option lasts 21 calendar days after its date, including weekends and public holidays, and expires at 4pm. It is not a 14-day exercise period followed by seven days to submit an application.
For example, an option dated 18 September 2026 expires on 9 October 2026 at 4pm. Check the date written on your form. Exercise requires the signed acceptance, delivery to the seller or authorised recipient, and payment of the agreed exercise fee. If taking a bank loan, have a valid Letter of Offer before exercise. Do not treat an indicative borrowing estimate as that document.
The resale-application submission timing is agreed separately in the OTP. Both parties must also submit their respective portions within seven days of each other. Keep both requirements in your calendar. Do not amend the prescribed form to improvise a longer option period.
CPF Board confirms that both HDB resale option fees must be paid in cash. They form part of the purchase price. A S$1,000 option fee plus S$4,000 exercise fee is S$5,000 paid towards the price, not an extra charge. The cap does not increase for a larger flat.
If using CPF or a housing loan, follow HDB’s Request for Value procedure. Submit the request by the next working day after the option date, and wait for its outcome before exercise. Establish the value and any cash-over-valuation exposure before committing. Our HDB cash-over-valuation guide explains the funding issue. Do not let money already paid pressure you into a purchase you cannot complete.
Private resale: read the acceptance instructions literally
CEA makes an optional private residential OTP template available. It allows the parties to specify the deadline, payment and recipient. Your lawyer should explain the version actually offered, including any added clauses, before money changes hands.
Signing a page at home is not necessarily valid exercise. Check what must be delivered, where, to whom, by what time, and with which payment. Arrange the bank transfer or cashier’s order early enough to comply. Ask your lawyer to confirm receipt and valid exercise.
In the CEA template, valid exercise creates the binding sale agreement. Before exercise, failure to proceed can mean losing the option money; after exercise, breach can have consequences beyond the deposit. A later loan refusal does not automatically cancel the purchase. Any financing condition or extension needs proper legal review and agreement, not an assumption based on an agent’s message.
Developer purchases: three weeks from document delivery
URA’s current booking guide sets out a different process for licensed developers selling uncompleted private residential homes:
- The booking fee is between 5% and 10% of the price.
- The developer must deliver the sale and purchase agreement and title documents within 14 days from the option date.
- The exercise period ends three weeks after delivery of those documents. Sign and return all required agreement copies.
- The balance downpayment brings the amount paid to 20% of the price. The developer may allow payment within eight weeks from the option date; check what your documents allow.
- If the option is not exercised, the developer may retain 25% of the booking fee and refund 75%.
On a hypothetical S$1.6 million unit with a 5% booking fee, booking costs S$80,000. The remaining downpayment is S$240,000. Non-exercise can cost S$20,000 of that booking fee. These are different figures from a resale contract with a 1% option and 4% exercise payment. Projects of four or fewer units are outside this licensing regime; have their contract examined separately.
Stamp duty and CPF need their own calendar
For a private purchase instrument signed in Singapore, IRAS requires BSD and any ABSD within 14 days after the signed contract or agreement. For an overseas-signed instrument, the general deadline is 30 days after receipt in Singapore. Ask your conveyancer to identify the relevant instrument and date, including electronic execution. The deadline is not postponed until you collect keys.
For an HDB purchase, follow the payment instructions and assessment issued through your HDB or lawyer-managed transaction. Do not transplant a private resale calendar onto HDB’s administrative process.
CPF eligibility does not mean immediate cash availability. CPF permits qualifying BSD, ABSD and legal fees, but completed-property stamp-duty reimbursement is processed at legal completion. Confirm the cash needed earlier with your lawyer. For an uncompleted purchase, direct CPF payment depends on completing the CPF charge documentation and lodgement within the duty deadline.
The household decision before exercise
Review the home again with the people who will use it. Check bedroom usability, accessibility, noise at relevant times, storage and the trip you actually make to work or school. Obtain the occupation terms in writing: a tenanted purchase and a home delivered vacant solve different problems.
For an investment purchase, check the signed tenancy and expenses rather than using an advertised rental yield to justify the deposit. For an upgrader, place the existing-home sale proceeds and CPF refund dates beside the new purchase payments. Money arriving after a deadline cannot fund that deadline without a separately confirmed arrangement.
Before exercising, your file should contain the reviewed contract, written funding position, duty estimate, verified payment instructions, unresolved legal or property issues, and a workable moving or letting plan. If the numbers no longer fit, compare the loss from not exercising with the larger commitment you would otherwise make. Get advice promptly on your actual contractual position.
General buyer information, not advice on a particular contract. The photographs provide Singapore housing context; no visit, sale or inspection of the pictured homes is claimed.