BTO (Build-To-Order) is HDB's main launch programme with new flats and 3-5 year wait. SBF (Sale of Balance Flats) is unsold BTO + repossessed flats — shorter wait (1-2 years) but limited choice. OBF (Open Booking of Flats) is rolling availability of remaining SBF stock with no balloting and immediate keys. Eligibility, pricing, and grants differ across all three.
BTO vs SBF vs OBF: at a glance
| Feature | BTO | SBF | OBF |
|---|---|---|---|
| Application window | Quarterly launches (Feb, May, Aug, Nov) | Quarterly with BTO | Rolling, anytime |
| Balloting | Yes — based on priority schemes | Yes — same priority groups | No — first-come-first-serve |
| Wait time | 3–5 years | 1–2 years (already built or near-completion) | Immediate keys |
| Selection | Wide (new project) | Limited (mixed leftovers) | Very limited (residual stock) |
| Pricing tier | Subsidised (lowest) | Same as BTO pricing | Same as BTO pricing |
| Grants | Full EHG + Family Grant eligible | Same grant eligibility | Same grant eligibility |
All three programmes use the same HDB Flat Eligibility (HFE) letter framework. Source: HDB eligibility.
Who should pick which
- BTO is best for: Couples with 3-5 year time horizons, looking for the widest project / unit-type selection.
- SBF is best for: Couples needing housing within 1-2 years, willing to accept limited choice for shorter wait.
- OBF is best for: Buyers needing immediate housing, willing to accept residual unit choice (often less desirable layouts or floors).
Worked example: 4-room BTO vs SBF in 2026
| Item | BTO (Tengah, Feb 2026) | SBF (mixed estates, Feb 2026) |
|---|---|---|
| Price | S$380,000 | S$380,000–S$450,000 |
| Expected key collection | 2029–2030 | 2027 |
| Ballot odds (non-mature) | ~5–8× oversubscribed | ~2–4× oversubscribed |
| Floor / orientation choice | Wide (early balloters) | Limited (whatever returned) |
For the broader Singapore HDB framework see the complete buying guide.
Frequently asked questions
Can I apply for both BTO and SBF in the same launch?
Yes. Each application is separate; couples often apply for both as a "two-shot" strategy.
Is OBF cheaper than BTO?
No. Pricing is set at original BTO launch and remains. OBF buyers pay the same price as the original BTO buyers in the same project.
What's the income ceiling for SBF?
Same as BTO — S$14,000 for families, S$7,000 for singles under the SC Single Scheme.