Blk 421 Choa Chu Kang Ave 4 is an HDB block in Choa Chu Kang (completed in 1990, 12 storeys, 88 units). As of Jul 2026, its median resale price over the last 24 months is $559,944, from 2 sales. 101 resale transactions have been recorded here since 1990.
Explore this block on the interactive map →| Town | Choa Chu Kang |
|---|---|
| Completed | 1990 |
| Lease from | 1992 |
| Storeys | 12 |
| Dwelling units | 88 |
| Unit mix (sold) | 4-room ×66 · 5-room ×22 |
| Recorded resales | 101 since 1990 |
| Flat type | Median price | Median $/m² | Sales |
|---|---|---|---|
| 4-Room | $559,944 | $5,384/m² | 2 |
Median monthly rent at this block: $3,200/mo (3 rental contracts, last 12 months).
Estimated gross rental yield: ~6.9% (Choa Chu Kang average: ~6.4%) — annual median rent over median resale price, before taxes, fees and vacancy.
On price per square metre, this block is cheaper than 51% of Choa Chu Kang blocks with recent sales.
For a typical 4-room flat here, our price model estimates $480,981–$538,047 (central estimate $509,514). Recent sales — median $528,322 — sit within 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 |
|---|---|---|---|
| 1996 | $338,000 | $550,137 | 9 |
| 1997 | $330,000 | $526,467 | 8 |
| 1998 | $264,800 | $423,602 | 13 |
| 1999 | $264,000 | $422,222 | 5 |
| 2000 | $318,250 | $502,211 | 4 |
| 2001 | $234,000 | $365,557 | 7 |
| 2002 | $217,000 | $340,332 | 3 |
| 2003 | $214,750 | $335,168 | 2 |
| 2005 | $227,500 | $347,583 | 2 |
| 2006 | $246,000 | $372,252 | 2 |
| 2007 | $264,500 | $391,976 | 6 |
| 2008 | $323,000 | $448,884 | 5 |
| 2009 | $362,500 | $500,833 | 2 |
| 2010 | $360,000 | $483,696 | 3 |
| 2011 | $435,800 | $556,324 | 1 |
| 2012 | $422,000 | $515,110 | 2 |
| 2013 | $436,000 | $519,910 | 2 |
| 2014 | $465,000 | $548,816 | 2 |
| 2015 | $468,750 | $556,149 | 4 |
| 2016 | $337,500 | $402,558 | 2 |
| 2018 | $400,000 | $472,298 | 3 |
| 2019 | $360,000 | $422,670 | 3 |
| 2020 | $300,000 | $352,832 | 1 |
| 2021 | $435,000 | $500,026 | 1 |
| 2023 | $510,000 | $526,903 | 3 |
| 2024 | $528,500 | $533,272 | 4 |
| 2025 | $574,888 | $574,888 | 1 |
| 2026 | $545,000 | $545,000 | 1 |
| Record sale | $630,000 (5-Room, 2023-04) |
|---|---|
| First recorded sale | $405,000 (1996-06) |
| Busiest year | 1998 · 13 sales |
| 10-year change (real) | +35% (+3.1%/yr, 2016→2026) |
| Total transacted | $34.6M across 101 sales |
| Month | Flat type | Storey | Area (m²) | Price |
|---|---|---|---|---|
| 2026-07 | 4-Room | 04 TO 06 | 104 | $545,000 |
| 2025-05 | 4-Room | 07 TO 09 | 104 | $574,888 |
| 2024-07 | 4-Room | 01 TO 03 | 104 | $525,000 |
| 2024-03 | 4-Room | 10 TO 12 | 104 | $532,000 |
| 2024-03 | 5-Room | 10 TO 12 | 132 | $620,000 |
| 2024-01 | 4-Room | 07 TO 09 | 104 | $504,888 |
| 2023-12 | 4-Room | 10 TO 12 | 104 | $510,000 |
| 2023-04 | 4-Room | 10 TO 12 | 104 | $496,000 |
| 2023-04 | 5-Room | 04 TO 06 | 132 | $630,000 |
| 2021-08 | 4-Room | 10 TO 12 | 104 | $435,000 |
| 2020-09 | 4-Room | 01 TO 03 | 104 | $300,000 |
| 2019-10 | 4-Room | 01 TO 03 | 104 | $315,000 |
| 2019-08 | 4-Room | 10 TO 12 | 104 | $360,000 |
| 2019-06 | 4-Room | 07 TO 09 | 104 | $364,000 |
| 2018-11 | 5-Room | 04 TO 06 | 132 | $400,000 |
| 2018-09 | 4-Room | 10 TO 12 | 104 | $325,000 |
| 2018-06 | 5-Room | 07 TO 09 | 132 | $405,000 |
| 2016-10 | 4-Room | 10 TO 12 | 104 | $345,000 |
| 2016-07 | 4-Room | 10 TO 12 | 104 | $330,000 |
| 2015-11 | 5-Room | 10 TO 12 | 132 | $480,000 |
| Block | Median (24 mo) | Median $/m² |
|---|---|---|
| 1. Blk 420 | $865,000 | $5,845/m² |
| 2. Blk 419 | $861,500 | $5,821/m² |
| 3. Blk 448 | $815,000 | $5,791/m² |
| 4. Blk 437 | $815,000 | $5,660/m² |
| 5. Blk 454 | $750,000 | $5,282/m² |
| 6. Blk 461 | $741,000 | $5,218/m² |
| 7. Blk 436 | $735,000 | $4,966/m² |
| 8. Blk 305 | $715,000 | $5,543/m² |
| 9. Blk 438 | $698,000 | $5,248/m² |
| 10. Blk 458 | $682,500 | $5,123/m² |
| 11. Blk 417 | $666,944 | $5,312/m² |
| 12. Blk 429 | $663,944 | $5,197/m² |
| 13. Blk 457 | $648,000 | $5,268/m² |
| 14. Blk 431 | $644,000 | $5,537/m² |
| 15. Blk 441 | $635,000 | $5,241/m² |
Showing the top 15 of 52 blocks.
The median resale price over the last 24 months is $559,944 (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 $480,981–$538,047 (central estimate $509,514). Recent sales — median $528,322 — sit within that range.
The median monthly rent is $3,200/mo over the last 12 months (3 contracts).
The block was completed in 1990 and its 99-year lease runs from 1992.