Quick answer: There is no public HDB formula that tells a seller exactly what a flat is “worth” before a transaction. The best starting point is recent comparable resale transactions, adjusted for the specific flat's attributes and current buyer demand. HDB's formal Request for Value happens only after a seller has granted an Option to Purchase (OTP), and it is submitted by the buyer when CPF savings or a housing loan are involved.
Key takeaways
- Start with recent nearby transactions for the same flat type and a similar remaining lease.
- An asking price, an agreed resale price and HDB's value are three different things.
- HDB's Request for Value is not a free pre-sale valuation service for sellers.
- The buyer must generally submit the Request for Value by the next working day after the OTP date when it is required.
- HDB decides whether a physical valuation is necessary; the resulting value is used for CPF and/or housing-loan purposes.
Start with evidence, not the highest listing
HDB itself directs sellers to recent transacted resale prices when setting a selling price. When you register an Intent to Sell, HDB also provides information including recent transactions nearby and an estimated-net-proceeds tool.
That is a better starting point than taking the highest asking price on a portal. Asking prices show what sellers hope to achieve. Completed transactions show what buyers actually agreed to pay.
What we look at when estimating a realistic sale range
The following are market-appraisal factors, not an official HDB valuation formula:
| Factor | Why it can matter to buyers |
|---|---|
| Recent comparable transactions | They establish the strongest evidence of what similar buyers have recently paid. |
| Remaining lease | Lease length can affect buyer perception, CPF usage and financing. |
| Flat type and floor area | A 4-room flat should not be benchmarked casually against a 5-room flat or a materially different layout. |
| Storey and outlook | Higher floors, openness, noise exposure and privacy can change buyer willingness to pay. |
| Condition and renovation | Renovation may improve saleability, but buyers rarely reimburse every dollar spent by the seller. |
| Block and micro-location | MRT distance, schools, shops, road noise and the exact block can create meaningful differences within the same estate. |
| Buyer pool | EIP/SPR quota, affordability and the number of competing listings can affect how many buyers can act. |
Asking price vs agreed price vs HDB value
Asking price is the seller's marketing position. Agreed resale price is the price negotiated between buyer and seller and stated in the OTP. HDB's value is the value used for the buyer's CPF usage and/or housing-loan reference where a Request for Value is required.
Those numbers can differ. If the agreed resale price exceeds HDB's value, the difference is commonly described as cash over valuation (COV), and that gap cannot simply be funded as though it were part of HDB's value.
How the Request for Value actually works
Under HDB's current resale terms, only a buyer who has been granted an OTP can submit a Request for Value. Where it is required, the buyer must submit it by the next working day after the Option Date. HDB then decides whether a valuation is needed and, if so, appoints a valuer from its panel.
The value made available through this process is generally valid for three months for that transaction. HDB also makes clear that accepting a Request for Value is not the same as approving the resale transaction.
NexDoor's view: price to create competition, not to win a listing portal
The strongest selling strategy is not automatically the highest launch price. An unrealistic asking price can reduce enquiries, cause a listing to go stale and make later reductions look like weakness. An unnecessarily low price can leave money on the table.
We prefer to define three numbers before launch:
- Evidence range: what comparable completed transactions support.
- Marketing position: where to launch based on competition and unit strengths.
- Decision floor: the lowest price that still supports your next-home plan after loan, CPF refund and costs.
The third number matters because selling “well” is meaningless if the sale proceeds do not support the next move.
How to build a comparable set instead of cherry-picking one transaction
One recent sale can be unusually high or low. A better appraisal starts with a small group of transactions and asks how comparable each one really is.
- Start with the same flat type in the same block or immediate cluster where possible.
- Check transaction dates so that older sales are not treated as though market conditions are unchanged.
- Compare remaining lease and floor level.
- Note meaningful differences in size, layout, corner position, outlook, noise and renovation condition.
- Look at competing active listings to understand what today's buyer will see alongside your flat.
The goal is not to invent an exact “premium” for every feature. It is to create a defensible range and understand why your flat might reasonably sit toward the top, middle or bottom of that range.
A useful seller exercise: separate market value from your required price
These are often two different numbers. Suppose recent evidence supports a certain market range, but your next-home plan only works if you achieve materially more. That does not automatically mean the market will fund the gap. It may mean the next-home budget needs to change.
Before listing, calculate:
- estimated outstanding loan at completion;
- estimated CPF refund and accrued interest;
- selling costs and moving costs;
- minimum cash buffer you want to preserve; and
- the amount genuinely required for the next purchase.
This turns pricing from “What is the highest number I can ask?” into “What range does the evidence support, and does that range make my next move viable?”
When to adjust the marketing position
A lack of offers does not automatically mean the property is overpriced: presentation, viewing access and marketing reach can also matter. But if qualified buyers repeatedly give similar pricing feedback and comparable flats are transacting below the asking level, the evidence should be taken seriously. A good selling strategy adapts before a listing becomes stale.
FAQ
Can HDB tell me my flat value before I sell?
The formal Request for Value is a buyer-side step after an OTP has been granted. Sellers can use HDB's recent transaction information and market evidence to estimate a sale range before that.
Does renovation always increase HDB value?
No fixed uplift is guaranteed. Renovation can improve buyer appeal, but the market decides how much, if anything, buyers will pay for it.
Should I price based on the last transaction in my block?
Use it as evidence, not as the only answer. Compare lease, floor, size, condition, outlook and timing.
Want a data-backed estimate?
Use HomeValue by NexDoor for a starting estimate, then speak to us if you want to translate the data into a practical selling range and next-home plan.
Accuracy note: Process details checked against HDB's Intent to Sell, Option to Purchase and Request for Value guidance available on 26 August 2026. Market-value observations are NexDoor's professional assessment, not an HDB valuation formula.
Official references
Material rules and dates in this article were checked against the following primary sources on 26 August 2026: