Quick answer: A smooth HDB resale transaction has several fixed checkpoints. The seller must register an Intent to Sell and generally wait at least 7 days before granting an OTP. The buyer needs a valid HFE letter before obtaining the OTP. The HDB OTP lasts 21 calendar days, the total option deposit cannot exceed $5,000, and resale completion is generally about 8 weeks after HDB accepts the resale application.
Key takeaways
- Seller: register Intent to Sell before marketing reaches the OTP stage.
- Buyer: obtain a valid HFE letter before receiving an OTP.
- Option Fee: between $1 and $1,000.
- Total deposit: Option Fee plus Option Exercise Fee cannot exceed $5,000.
- Option Period: 21 calendar days, expiring at 4pm on the 21st day.
- Buyer using CPF or a housing loan may need to submit a Request for Value by the next working day after the Option Date.
- Buyer and seller submit their resale-application portions separately, within the agreed OTP timeframe and within 7 calendar days of each other.
Step 1: seller registers Intent to Sell
HDB requires a seller to register an Intent to Sell through My Flat Dashboard. HDB uses this step to confirm sale eligibility, EIP/SPR information, recent transactions and estimated sale proceeds.
HDB states that the seller may start granting an OTP only after the minimum waiting period shown in the Intent to Sell, which is at least seven days after registration. The Intent to Sell is valid for 12 months.
Step 2: buyer gets the HFE letter and financing ready
A resale buyer must have a valid HFE letter before obtaining an OTP from a seller and when submitting the resale application. The HFE letter sets out the household's eligibility to buy, CPF housing grants and HDB housing loan, where applicable.
If the buyer is using a bank loan, financing should also be advanced before the OTP is exercised. HDB's current terms require a buyer using a financial-institution loan to have a valid Letter of Offer before exercising the OTP.
Step 3: agree the price and grant the OTP
The seller and buyer negotiate the true resale price and use HDB's prescribed Option to Purchase.
| OTP item | Current HDB rule |
|---|---|
| Option Fee | $1 to $1,000. |
| Option Exercise Fee | Negotiated, but together with the Option Fee the total deposit cannot exceed $5,000. |
| Option Period | 21 calendar days, including weekends and public holidays. |
| Expiry | 4pm on the 21st calendar day. |
Once the seller grants the OTP, the seller cannot grant another OTP to someone else during that option period.
Step 4: Request for Value, where required
If the buyer is using CPF savings and/or a housing loan and HDB's rules require it, the buyer submits a Request for Value. HDB's resale terms state that it must be submitted by the next working day after the Option Date.
HDB then decides whether an actual valuation inspection is needed. The value becomes the basis for CPF usage and/or the housing-loan reference.
Step 5: buyer exercises the OTP
The buyer signs the acceptance portion and pays the agreed Option Exercise Fee before the OTP expires. If the buyer does not exercise the OTP, the option lapses and the seller keeps the Option Fee.
This is the point at which the buyer should be fully comfortable with financing, CPF use, COV risk, property condition and the legal commitment.
Step 6: both sides submit the resale application
The OTP contains an agreed timeframe for the buyer and seller to submit their respective resale applications. HDB also requires both portions to be submitted within seven calendar days of each other.
The application is only complete after HDB receives both parties' portions and the necessary supporting documents. EIP and SPR quota eligibility is assessed against the prevailing position at submission.
Step 7: HDB acceptance and completion
After HDB accepts the resale application and processes the transaction, resale completion is generally scheduled about 8 weeks after acceptance. The actual appointment date is confirmed through HDB.
During this period, buyers and sellers deal with legal documents, CPF and loan arrangements, payments, inspection requirements and any approved extension-of-stay arrangement.
NexDoor's view: most timeline problems start before the OTP
The legal milestones are clear. The mess usually comes from poor sequencing: a seller has nowhere to move, a buyer's loan is not ready, CPF proceeds are overestimated, or the parties agree on a date that does not work with the next transaction.
Before the OTP, map the transaction backwards from the intended move date. If you are selling and buying at the same time, treat both transactions as one cash-flow and housing plan.
A planning timeline for a straightforward resale
The following is an illustrative sequence, not a guaranteed completion calendar:
| Stage | What should already be ready |
|---|---|
| Before OTP | Seller's Intent to Sell waiting period completed; buyer's valid HFE letter and financing plan ready. |
| OTP granted | Agreed price, Option Fee and the 21-day option period begin. |
| Next working day where required | Buyer submits Request for Value if CPF/loan usage requires it. |
| Before OTP expiry | Buyer confirms financing, valuation/COV implications and exercises if proceeding. |
| Resale application | Buyer and seller submit their portions within the agreed timeframe and within seven calendar days of each other. |
| After HDB acceptance | Legal, CPF and loan completion work continues toward the appointment, generally around eight weeks later. |
Selling and buying at the same time is a different level of planning
A homeowner upgrading from one property to another has at least two timelines, not one. Before granting or exercising either OTP, map:
- when sale proceeds and CPF refunds become available;
- whether the next-home downpayment is needed before those proceeds arrive;
- where the household lives if completion dates do not align;
- whether an extension of stay is available and acceptable;
- loan approval and cash buffers on both transactions; and
- what happens if either buyer or seller requests a timing change.
A transaction can comply perfectly with HDB rules and still create a poor moving experience if these cash-flow and occupancy issues were not planned.
Documents and decisions buyers should not leave until the last day
The 21-day OTP period feels long at the start and short at the end. Use it to finish due diligence, not to begin it. Financing, CPF usage, property condition, intended renovations, COV tolerance and legal questions should be substantially understood before exercise. The OTP is a legal commitment, not a reservation while the buyer continues deciding whether the flat is affordable.
FAQ
How long does the whole HDB resale process take?
There is no single fixed start-to-finish period because negotiation and OTP timing vary. Once HDB accepts the resale application, completion is generally about eight weeks later.
Can seller and buyer change the HDB OTP form?
No. HDB requires the prescribed OTP and states that it must not be amended.
Can I get an OTP before my HFE letter?
Resale buyers need a valid HFE letter before obtaining an OTP.
Coordinating a sale and purchase?
NexDoor can map the dates, proceeds, financing and contingency plan before you commit to an OTP on either side.
Accuracy note: Checked against HDB's Intent to Sell, HFE, Option to Purchase, Request for Value, resale-application and completion guidance available on 26 August 2026.
Official references
Material rules and dates in this article were checked against the following primary sources on 26 August 2026: