Block 421 Serangoon Ctrl
421 Serangoon Ctrl, Singapore 550421
Block 421 Serangoon Ctrl is an HDB block in Serangoon, completed in 1988, with 96 dwelling units. 4-Room flats have recently resold around S$680k (105 sqm), from 93 resales on record. The lease has approximately 62 years remaining.
What are the key facts about Block 421 Serangoon Ctrl?
Block 421 Serangoon Ctrl is an HDB block in Serangoon, completed in 1988, with 96 dwelling units.
- Town
- Serangoon
- Planning area
- Serangoon
- Completed
- 1988
- Storeys
- 13
- Total units
- 96
- Market segment
- OCR
- Median resale
- S$680k
- Last transacted
- Apr 2026
- Remaining lease
- ≈ 62 years
What are resale prices at Block 421 Serangoon Ctrl?
4-Room flats have recently resold around S$680k (S$612 psf), from 93 resales on record (HDB caveat data).
| Flat type | Resales | Median price | Size | PSF |
|---|---|---|---|---|
| 4-Room | 68 | S$660,000recent | 105 sqm | S$600 psf |
| 5-Room | 25 | S$525,000recent | 121 sqm | S$403 psf |
“Recent” medians use the latest transactions; for older blocks the all-time median spans 30+ years and understates today’s price. Source: HDB resale caveats, through Apr 2026.
What has recently sold at Block 421 Serangoon Ctrl?
Block 421 Serangoon Ctrl has 93 recorded resales; the most recent transacted at S$865,000 in Apr 2026 (HDB caveat data).
| Date | Flat type | Storey | Size | Price |
|---|---|---|---|---|
| Apr 2026 | 4-Room | 10 TO 12 | 105 sqm | S$865,000 |
| Mar 2025 | 5-Room | 04 TO 06 | 121 sqm | S$818,000 |
| Oct 2023 | 4-Room | 07 TO 09 | 103 sqm | S$770,000 |
| Jul 2023 | 5-Room | 04 TO 06 | 121 sqm | S$875,000 |
| Apr 2023 | 4-Room | 10 TO 12 | 113 sqm | S$730,000 |
| Sept 2022 | 4-Room | 04 TO 06 | 105 sqm | S$680,000 |
| Sept 2022 | 4-Room | 07 TO 09 | 94 sqm | S$627,000 |
| Feb 2022 | 4-Room | 13 TO 15 | 111 sqm | S$748,000 |
| Sept 2021 | 4-Room | 07 TO 09 | 103 sqm | S$678,000 |
| Jul 2021 | 4-Room | 10 TO 12 | 105 sqm | S$640,000 |
| Jul 2020 | 4-Room | 04 TO 06 | 111 sqm | S$660,000 |
| Jun 2020 | 4-Room | 10 TO 12 | 103 sqm | S$520,000 |
What flat types are in Block 421 Serangoon Ctrl?
Block 421 Serangoon Ctrl has 96 units, mostly 4-Room flats.
Unit stock by flat type, from the HDB property information dataset.
How far is Block 421 Serangoon Ctrl from MRT and schools?
The nearest MRT/LRT to Block 421 Serangoon Ctrl is Serangoon MRT, about 338 m away (~5 min walk). 5 schools are within 1 km, including 1 primary school.
Getting around
- Serangoon MRT338 m · ~5 min
- Bartley MRT895 m · ~14 min
Schools nearby
Flats within 1 km of a primary school qualify for Primary 1 (P1) registration priority.
- St. Gabriel's Secondary SchoolSecondary schoolwithin 1 km279 m
- Zhonghua Secondary SchoolSecondary schoolwithin 1 km646 m
- Yangzheng Primary SchoolPrimary schoolwithin 1 km · P1 priority737 m
- Maris Stella High SchoolMixed-level schoolwithin 1 km879 m
- Nanyang Junior CollegeJunior collegewithin 1 km983 m
- Paya Lebar Methodist Girls' School (Primary)Primary school1.1 km
- Paya Lebar Methodist Girls' School (Secondary)Secondary school1.1 km
- Bartley Secondary SchoolSecondary school1.3 km
Shops, food & parks
Straight-line distances from the block. Source: PropKaki amenities data.
What does it cost to buy a flat at Block 421 Serangoon Ctrl?
Buying a flat at Block 421 Serangoon Ctrl (~S$680k) needs about S$5,421/mo in income and S$2,553/mo in repayments, after S$15,000 stamp duty and a S$170k downpayment.
Illustrative, for a buyer at the recent median resale price (S$680k) — 25% downpayment (bank-loan basis), 25-year loan at 3.5% p.a. Rates as of May 2026. Run it for your own profile →
Buyer's Stamp Duty
S$15,000
BSD, tiered
Downpayment (25%)
S$170k
cash + CPF
Monthly instalment
S$2,553/mo
25y @ 3.5%
Income required
S$5,421/mo
MSR/TDSR @ stress rate
First-time HDB buyers pay no Additional Buyer’s Stamp Duty (ABSD) and may qualify for CPF Housing Grants of up to S$80,000+, which lower the cash required — these are not included above. An HDB concessionary loan also allows a smaller downpayment.
Frequently asked questions about Block 421 Serangoon Ctrl
What is the resale price at Block 421 Serangoon Ctrl?⌄
4-Room flats at Block 421 Serangoon Ctrl have recently resold around S$680k (105 sqm), based on HDB resale caveats. Resale prices vary by flat type, floor and remaining lease.
How much are flats at Block 421 Serangoon Ctrl by flat type?⌄
4-Room ≈ S$660k; 5-Room ≈ S$525k. Figures are median resale prices from HDB caveats.
How many years are left on the lease at Block 421 Serangoon Ctrl?⌄
Block 421 Serangoon Ctrl has approximately 62 years left on its 99-year lease (completed 1988). This figure is taken from the most recent transacted flat.
How many units are in Block 421 Serangoon Ctrl?⌄
Block 421 Serangoon Ctrl has 96 dwelling units across up to 13 storeys, mostly 4 room flats.
What is the nearest MRT to Block 421 Serangoon Ctrl?⌄
The nearest MRT/LRT station to Block 421 Serangoon Ctrl is Serangoon MRT, about 338 m away (~5 min walk).
Which primary schools are within 1 km of Block 421 Serangoon Ctrl?⌄
Yangzheng Primary School is within 1 km of Block 421 Serangoon Ctrl — flats within 1 km of a primary school qualify for Primary 1 (P1) registration priority.
Is Block 421 Serangoon Ctrl a good place to buy an HDB resale flat?⌄
Block 421 Serangoon Ctrl sits in Serangoon, in the Serangoon planning area. Whether it suits you depends on your budget, the flat type, the remaining lease (≈62 years) and proximity to MRT and schools — all of which are summarised on this page from HDB resale data.
