Answer
HDB Balance Units Clearance (BUC)
Leftover BTO flats, no balloting, shorter wait. Here's how BUC works and whether it's worth considering.
Answer: Balance Units Clearance (BUC) is HDB's sale of leftover BTO flats — units forfeited by buyers or not selected during the original ballot. BUC flats are sold at fixed prices on a first-come, first-served basis (no balloting). Prices are set at the original BTO launch price, which may be lower than current BTO prices since prices have risen over time. Waiting time is much shorter (some are near completion or already built). The trade-off: you get limited choice of unit, floor, and facing — you pick from whatever is left.
How BUC Works
1. HDB lists available units
HDB publishes the list of available BUC units on its website, including the estate, block, flat type, floor, unit number, and price. Units come from various BTO launches that had unsold or forfeited units.
2. Check your eligibility
Same eligibility criteria as BTO: Singapore Citizen, income ceiling ($14,000 couples / $7,000 singles), no private property, and applicable schemes (Family, Singles, etc.). You need a valid HFE letter.
3. Apply during the sale window
During the BUC sales exercise, apply online through the HDB portal. Unlike BTO, there is no ballot. Units are allocated on a first-come, first-served basis based on the order of confirmed applications.
4. Select your unit
If your application is successful, you select from the remaining available units in your chosen project. Early applicants get first pick. By the time later applicants select, the better units may be taken.
5. Shorter wait to keys
Since BUC flats are from earlier BTO launches, many are under construction or near completion. Some are even completed — you could get keys in months instead of the typical 3–5 year BTO wait.
BUC vs BTO vs Resale HDB
| Factor | BUC | BTO | Resale |
|---|---|---|---|
| Selection | First-come, first-served | Ballot (luck-based) | Open market |
| Price | Original BTO price (fixed) | Subsidised (current) | Market rate (highest) |
| Wait time | 0–3 years | 3–5 years | ~3 months |
| Unit choice | Limited (leftovers) | Moderate (ballot queue) | Wide (any listing) |
| Location choice | Limited (what's available) | Choose from launch estates | Any town |
| Grants | Yes (same as BTO) | Yes | Yes (different amounts) |
| Income ceiling | $14K / $7K | $14K / $7K | No ceiling |
BUC Pricing — How Much Can You Save?
BUC flats are priced at their original BTO launch price. Since BTO prices have generally increased year-on-year, a BUC flat from a 2022–2023 launch could be priced 10–20% below what a comparable BTO in the same area would cost today.
| Flat Type | Typical BUC Price | Current BTO Price | Potential Saving |
|---|---|---|---|
| 2-Room Flexi (non-mature) | $100,000–$160,000 | $120,000–$210,000 | $10,000–$50,000 |
| 3-Room (non-mature) | $180,000–$280,000 | $220,000–$350,000 | $20,000–$70,000 |
| 4-Room (non-mature) | $260,000–$400,000 | $320,000–$530,000 | $30,000–$100,000 |
| 5-Room (non-mature) | $340,000–$500,000 | $420,000–$650,000 | $40,000–$120,000 |
Savings are illustrative, based on BTO price increases over 2–3 years. Actual savings depend on the original launch date and estate. Mature estate BUC flats may have smaller discounts relative to current prices.
Who Should Consider BUC?
- →Unsuccessful BTO applicants — tired of losing the ballot? BUC has no ballot
- →Couples who need a flat soon — some BUC flats are near completion or already built
- →Budget-conscious buyers — original BTO prices may be lower than today's launch prices
- →Flexible on location and unit — if you don't mind limited choice, BUC offers real value
- →Singles 35+ — 2-room Flexi BUC flats are available for singles
Tips for Securing a BUC Flat
- →Get your HFE letter ready before the BUC sales exercise opens — you need it to apply
- →Apply early — it's first-come, first-served, so timing matters
- →Research the project beforehand — know the layout, facing, and surroundings before the exercise starts
- →Be flexible — have 2–3 acceptable units in mind in case your first choice is taken
- →Check the HDB portal regularly — BUC exercises are announced a few weeks in advance
Considering a BUC flat?
Check how much you can afford and what grants you qualify for before the next BUC exercise.
FAQ
What is HDB Balance Units Clearance (BUC)?
BUC is when HDB sells leftover BTO flats that were not taken up during the original BTO launch. These are units where buyers forfeited their bookings, or units that were not selected during the ballot. BUC flats are sold at fixed prices on a first-come, first-served basis during periodic sales exercises.
How is BUC different from a regular BTO launch?
BTO requires balloting and waiting. BUC flats are sold first-come, first-served at a fixed price — no ballot needed. BUC flats are also closer to completion (or already completed), so waiting time is much shorter. However, you get limited choice of unit and facing.
Are BUC flats cheaper than regular BTO?
BUC flats are priced at the original BTO launch price, which may be lower than current BTO prices if the original launch was years ago. However, they are not discounted below the original BTO price. The savings come from the fact that BTO prices have generally risen over time.
Can singles apply for BUC flats?
Yes, singles aged 35 and above can apply for 2-room Flexi BUC flats in non-mature estates under the Single Singapore Citizen (SSC) scheme. The same eligibility criteria as BTO apply: income ceiling of $7,000, Singapore Citizen, and no private property ownership.
What's the catch with BUC flats?
Limited choice — you pick from whatever is left, which often means less desirable units (lower floors, certain facings, near rubbish chutes or substations). The estate and block are fixed. Some BUC flats are in less popular estates. But if you value speed and certainty over choice, BUC is excellent.
How often does HDB release BUC flats?
HDB typically conducts BUC sales exercises a few times a year, often alongside or between BTO launches. The available units are listed on the HDB website. Check the HDB portal regularly as popular units go quickly on a first-come, first-served basis.
Related
- BTO Ballot Chances — 2x for first-timers
- HDB Flat Type Comparison — 2-room to 3Gen
- BTO Income Ceiling 2026 — $14K couples, $7K singles
- HFE Letter — eligibility + loan + grants
- BTO Waiting Time by Estate — 3.5–5 years
Last updated Feb 2026. BUC availability and pricing change with each sales exercise. Check HDB's website for the latest listings. This is general information, not financial advice.