Blk 421 Serangoon Ctrl is an HDB block in Serangoon (completed in 1988, 13 storeys, 96 units). As of Jul 2026, its median resale price over the last 24 months is $841,500, about 8% above the Serangoon median, from 2 sales. 93 resale transactions have been recorded here since 1990.
Explore this block on the interactive map →| Town | Serangoon |
|---|---|
| Completed | 1988 |
| Lease from | 1989 |
| Storeys | 13 |
| Dwelling units | 96 |
| Unit mix (sold) | 4-room ×72 · 5-room ×24 |
| Recorded resales | 93 since 1990 |
| Flat type | Median price | Median $/m² | Sales |
|---|---|---|---|
| 4-Room | $865,000 | $8,238/m² | 1 |
| 5-Room | $818,000 | $6,760/m² | 1 |
Median monthly rent at this block: $3,850/mo (6 rental contracts, last 12 months).
Estimated gross rental yield: ~5.5% (Serangoon average: ~5.1%) — annual median rent over median resale price, before taxes, fees and vacancy.
On price per square metre, this block is cheaper than 32% of Serangoon blocks with recent sales.
For a typical 4-room flat here, our price model estimates $693,157–$775,395 (central estimate $734,276). Recent sales — median $779,351 — sit above that range. The model explains 94% of resale prices with a typical error of ±6%. Indicative only — not an official valuation.
| Year | Median (nominal) | Median (today's $) | Sales |
|---|---|---|---|
| 1993 | $208,000 | $359,941 | 1 |
| 1994 | $212,000 | $355,854 | 5 |
| 1995 | $335,000 | $552,780 | 4 |
| 1996 | $400,000 | $651,050 | 3 |
| 1997 | $341,000 | $544,016 | 5 |
| 1998 | $290,000 | $463,914 | 10 |
| 1999 | $301,500 | $482,196 | 12 |
| 2000 | $318,000 | $501,817 | 2 |
| 2001 | $275,125 | $429,802 | 4 |
| 2002 | $342,000 | $536,376 | 3 |
| 2003 | $281,000 | $438,566 | 1 |
| 2004 | $270,000 | $414,468 | 1 |
| 2005 | $242,000 | $369,737 | 1 |
| 2006 | $280,000 | $423,702 | 3 |
| 2007 | $327,500 | $485,339 | 2 |
| 2008 | $435,000 | $604,534 | 2 |
| 2009 | $420,000 | $580,275 | 4 |
| 2010 | $458,000 | $615,369 | 2 |
| 2011 | $562,500 | $718,064 | 2 |
| 2012 | $595,000 | $726,281 | 2 |
| 2013 | $649,000 | $773,902 | 2 |
| 2014 | $575,000 | $678,643 | 3 |
| 2015 | $627,500 | $744,499 | 2 |
| 2016 | $608,000 | $725,200 | 1 |
| 2017 | $700,000 | $830,146 | 1 |
| 2018 | $628,000 | $741,508 | 1 |
| 2019 | $635,000 | $745,542 | 2 |
| 2020 | $590,000 | $693,904 | 2 |
| 2021 | $659,000 | $757,511 | 2 |
| 2022 | $680,000 | $736,495 | 3 |
| 2023 | $770,000 | $795,521 | 3 |
| 2025 | $818,000 | $818,000 | 1 |
| 2026 | $865,000 | $865,000 | 1 |
| Record sale | $875,000 (5-Room, 2023-07) |
|---|---|
| First recorded sale | $208,000 (1993-11) |
| Busiest year | 1999 · 12 sales |
| 10-year change (real) | +19% (+1.8%/yr, 2016→2026) |
| Total transacted | $39.6M across 93 sales |
| Month | Flat type | Storey | Area (m²) | Price |
|---|---|---|---|---|
| 2026-04 | 4-Room | 10 TO 12 | 105 | $865,000 |
| 2025-03 | 5-Room | 04 TO 06 | 121 | $818,000 |
| 2023-10 | 4-Room | 07 TO 09 | 103 | $770,000 |
| 2023-07 | 5-Room | 04 TO 06 | 121 | $875,000 |
| 2023-04 | 4-Room | 10 TO 12 | 113 | $730,000 |
| 2022-09 | 4-Room | 07 TO 09 | 94 | $627,000 |
| 2022-09 | 4-Room | 04 TO 06 | 105 | $680,000 |
| 2022-02 | 4-Room | 13 TO 15 | 111 | $748,000 |
| 2021-09 | 4-Room | 07 TO 09 | 103 | $678,000 |
| 2021-07 | 4-Room | 10 TO 12 | 105 | $640,000 |
| 2020-07 | 4-Room | 04 TO 06 | 111 | $660,000 |
| 2020-06 | 4-Room | 10 TO 12 | 103 | $520,000 |
| 2019-06 | 4-Room | 07 TO 09 | 105 | $635,000 |
| 2019-01 | 4-Room | 10 TO 12 | 105 | $635,000 |
| 2018-11 | 4-Room | 04 TO 06 | 103 | $628,000 |
| 2017-11 | 4-Room | 10 TO 12 | 113 | $700,000 |
| 2016-04 | 4-Room | 07 TO 09 | 103 | $608,000 |
| 2015-09 | 5-Room | 07 TO 09 | 121 | $730,000 |
| 2015-01 | 4-Room | 04 TO 06 | 111 | $525,000 |
| 2014-10 | 5-Room | 10 TO 12 | 121 | $738,000 |
| Block | Median (24 mo) | Median $/m² |
|---|---|---|
| 1. Blk 424 | $1,180,000 | $8,054/m² |
| 2. Blk 418 | $1,099,000 | $7,527/m² |
| 3. Blk 422 | $977,500 | $8,381/m² |
| 4. Blk 414 | $965,000 | $8,540/m² |
| 5. Blk 205 | $925,000 | $7,930/m² |
| 6. Blk 412 | $915,000 | $7,562/m² |
| 7. Blk 411 | $905,000 | $8,413/m² |
| 8. Blk 410 | $868,000 | $9,333/m² |
| 9. Blk 420 | $860,000 | $8,099/m² |
| 10. Blk 427 | $850,444 | $7,873/m² |
| 11. Blk 421 | $841,500 | $7,499/m² |
| 12. Blk 419 | $820,000 | $7,523/m² |
| 13. Blk 409 | $809,000 | $8,153/m² |
| 14. Blk 208 | $735,000 | $7,689/m² |
| 15. Blk 202 | $720,000 | $8,571/m² |
Showing the top 15 of 22 blocks.
The median resale price over the last 24 months is $841,500 (2 sales, as of Jul 2026). See the by-type table above for 3-room vs 4-room medians.
For a typical 4-room flat here, our price model estimates $693,157–$775,395 (central estimate $734,276). Recent sales — median $779,351 — sit above that range.
The median monthly rent is $3,850/mo over the last 12 months (6 contracts).
The block was completed in 1988 and its 99-year lease runs from 1989.