SBF stands for Sale of Balance Flats, the HDB exercise that resells flats nobody booked in past launches, plus surplus SERS replacement units and flats people handed back. In February 2026 HDB put 4,320 SBF units on the market, and roughly one in five was already built. That is the draw: instead of waiting three to four years for a BTO to finish, you might collect keys in months. The catch is that an SBF launch is leftovers, so the towns, blocks and layouts that survived earlier ballots are the ones other buyers passed over. This guide covers the 2026 numbers, who qualifies, the grants worth up to $120,000, your real ballot odds, and when SBF beats both BTO and resale.
Build-To-Order is HDB building a fresh project from scratch once enough people commit. SBF is the opposite end of the same pipe. Every BTO launch leaves a tail of unbooked units, buyers cancel after balloting, some flats get repurchased by HDB, and SERS exercises generate spare replacement flats. HDB pools all of that and offers it as one batch a couple of times a year. That batch is the Sale of Balance Flats.
Because the stock is recycled, the completion status is all over the map. Some SBF units sit in projects still under construction, so you wait like a normal BTO buyer. Others are finished blocks with people already living next door, which means keys within months and a flat you can physically walk through before you commit. Both show up in the same exercise, which is why reading each project's status line matters more in SBF than anywhere else.
One layer that trips people up after October 2024: HDB now sorts new flats into Standard, Plus and Prime, each with different subsidies and resale restrictions. SBF units from BTO projects launched before that date were sold under the old rules and skip the Plus/Prime clawback. Units returned from newer Plus or Prime projects keep their 10-year minimum occupation period and subsidy clawback. Always check which regime a unit falls under before you fall in love with it. Our MOP entry breaks down what that lock-in means in practice.
HDB launched 9,012 flats across its February 2026 BTO and SBF exercises combined. Of those, 4,320 were SBF units, spread across multiple towns and flat sizes. Around 20% were already completed, which is the slice worth chasing if speed is your priority. For scale, the February 2025 SBF exercise carried 5,590 units, so 2026's batch is smaller and likely to be fought over harder.
| Metric | Figure |
|---|---|
| Total flats launched (BTO + SBF) | 9,012 |
| SBF units offered | 4,320 |
| SBF units already completed | ~20% (around 860) |
| February 2025 SBF batch (for comparison) | 5,590 |
| Typical SBF exercises per year | About two |
Eligibility tracks BTO almost exactly. You need to be a Singapore Citizen, form a valid household nucleus or apply as a single, sit under the income ceiling, and not hold an interest in other property within the disposal window. As a couple buying together you each need to be at least 21; as a single under the Single Singapore Citizen scheme you need to be 35. The BTO eligibility rules carry across, so if a launch shut you out, SBF will too.
Income ceilings for new flats run to $14,000 a month for families buying a 4-room or larger, $21,000 for multi-generation households, and $7,000 for some 3-room projects and 99-year 2-room Flexi units. The number that gates the grant is lower: the Enhanced CPF Housing Grant tapers off at $9,000 average household income.
The HFE letter is the single document that confirms what you can buy, which grants you qualify for, and how much HDB will lend you. Apply for it on the HDB Flat Portal before the exercise opens, because processing can take a month or more at peak, and you cannot submit an SBF application without one. Run your sums through our BTO affordability calculator while you wait so you know your real budget, not your wishful one.
SBF buyers tap the same grant stack as BTO buyers. First-timer families can receive an Enhanced CPF Housing Grant of up to $120,000, with the amount tapering as income rises toward the $9,000 ceiling. First-timer singles get up to $60,000. Layer the standard CPF Housing Grant and the Proximity Housing Grant on top where you qualify, and a first-timer family can stack as much as $230,000 in total housing grants depending on flat type and circumstances.
Grants land in your CPF Ordinary Account and cut what you finance, not your cash at booking. They do not reduce the headline price you see on the listing, so read prices as before-grant figures and work the net cost yourself.
| Grant | First-timer family (max) | First-timer single (max) |
|---|---|---|
| Enhanced CPF Housing Grant (EHG) | $120,000 | $60,000 |
| CPF Housing Grant | Up to $80,000 | Half of family amount |
| Proximity Housing Grant | Up to $30,000 | Up to $15,000 |
| Indicative combined ceiling | Around $230,000 | Around half |
The booking fee is the first real money. It follows flat size: $500 for a 2-room Flexi, $1,000 for a 3-room, and $2,000 for a 4-room or larger. That fee is not extra, it counts toward your downpayment later. First-timer couples normally get stamp duty remission on the purchase, so budget the option fee plus legal and survey fees rather than the full Buyer's Stamp Duty.
On the loan, the HDB concessionary loan now caps loan-to-value at 75%, down from 80% since 20 August 2024. That means a 25% downpayment, but you can pay all of it from your CPF Ordinary Account, so your cash outlay at this stage can be zero if your OA is healthy. The HDB loan rate sits at 2.60%, pegged 0.1% above the CPF OA rate. A bank loan also goes to 75% LTV but demands at least 5% of price in hard cash. Weigh the two in our HDB loan vs bank loan comparison before you decide.
SBF still runs on a computer ballot, not first come first served, so applying early on opening day buys you nothing. Where SBF differs from BTO is the math beneath the ballot. The unit pool is small and the demand is concentrated, because everyone can see the exact towns and blocks on offer. Popular mature estates get swamped while completed units in less central towns clear faster.
Your queue position decides whether you get to pick at all. Even a strong ballot number is worthless if the few units you want are gone by the time your turn arrives. First-timers keep their priority allocation, and family and parenthood priority schemes apply as in BTO, so check whether you qualify for an extra ballot chance before you write off your odds. If a unit you want is in a different scheme tier like Plus or Prime, the restrictions, not just the price, should shape your choice.
If SBF leftovers do not clear, the truly unwanted units roll into Open Booking. That is the no-ballot, first-come-first-served queue where you grab a number online and book on the spot. Open Booking is the fastest route to keys, but you are choosing from the units that survived both a BTO launch and an SBF exercise, so manage expectations on location and floor.
The decision is really a trade between waiting time, choice and price. BTO gives you the widest pick and the lowest price but the longest wait. Resale gives you instant choice and any location but no fresh-flat subsidy and a market price. SBF sits in the middle, faster than BTO with a real shot at a completed unit, but with whatever scraps the ballot left behind.
| Factor | SBF | BTO | Resale |
|---|---|---|---|
| Waiting time | Months to a few years; some completed | About 3 to 4 years | Move-in ready |
| Choice of unit | Narrow, leftovers only | Widest, whole new project | Anything on the market |
| Price level | Subsidised, before grants | Lowest, before grants | Open market |
| Grants | Up to $120k EHG (family) | Up to $120k EHG (family) | Resale grants, no EHG on price |
| Can inspect before buying | Yes, if completed | No | Yes |
Run the resale alternative through our BTO vs resale comparison if a completed SBF unit is your goal, since a finished SBF flat and a resale flat solve the same problem: keys now. The difference is the grant treatment and the price you pay to get there.
Treat the HFE letter as the gate, not a formality. Without it you cannot apply, and the nine-month validity means timing it against the next launch keeps it fresh when you need it.
SBF means Sale of Balance Flats. It is an HDB exercise that resells unbooked flats from earlier BTO launches, surplus SERS replacement flats and units repurchased by HDB, usually held about twice a year alongside a BTO launch.
Often yes. Around 20% of the February 2026 SBF units were already completed, so you could collect keys in months rather than the three to four years a typical BTO takes to build. The rest of the SBF pool is still under construction and waits like a normal BTO.
SBF buyers use the same stack as BTO buyers. First-timer families can receive an Enhanced CPF Housing Grant of up to $120,000 and singles up to $60,000, with the CPF Housing Grant and Proximity Housing Grant on top, reaching around $230,000 combined for some families.
Not necessarily. SBF runs on the same computer ballot, but the unit pool is small and demand concentrates on visible popular blocks. A good queue number means little if the few units you want are taken before your turn, so completed units in less central towns clear most easily.
SBF is balloted, with a window to apply and a queue number assigned by computer. Open Booking offers the units left unsold after SBF on a first-come-first-served basis, where you grab a queue number online and book on the spot without a ballot.
This is general financial information for Singapore, not personal financial advice. Figures change — verify current rates against the official sources above before acting. See our full disclaimer.