Blk 421 Choa Chu Kang Ave 4

8 filed resale transactions · Choa Chu Kang · 64 years 11 months of lease left

Median, per square foot
472 psf
Observed range
$436 — $514 psf
S$539k median price

Lease to 2091 · 8 filed transactions

S$539k
Median price
8
Filed transactions
17%
Spread, low to high

HDB Resale Flat Prices (data.gov.sg) · 2023-09 to 2026-09 · accessed 2026-09-10

Which of these are you

I’m considering buying this
I own this

Median price by month7 months with a sale

Dec '23 · S$510kAug '26 · S$555k

The transactions behind those figures8 of 8

Nothing modelled — these are the filed sales.

104 sqm · storey 10–124 ROOM · Model A · 2026-08
S$555,000$496 psf
104 sqm · storey 04–064 ROOM · Model A · 2026-07
S$545,000$487 psf
104 sqm · storey 07–094 ROOM · Model A · 2025-05
S$574,888$514 psf
104 sqm · storey 01–034 ROOM · Model A · 2024-07
S$525,000$469 psf
104 sqm · storey 10–124 ROOM · Model A · 2024-03
S$532,000$475 psf
132 sqm · storey 10–125 ROOM · Model A · 2024-03
S$620,000$436 psf
104 sqm · storey 07–094 ROOM · Model A · 2024-01
S$504,888$451 psf
104 sqm · storey 10–124 ROOM · Model A · 2023-12
S$510,000$456 psf
Why a range, not one number. Valuation tools routinely disagree by S$15,000–S$80,000 on the same home, because none can see your floor, facing, renovation or lease. The spread above is the real one — the cheapest and dearest psf actually filed here over the period. Where your unit sits inside it depends on the things the data cannot see.
Contains information from HDB Resale Flat Prices (data.gov.sg) accessed on 2026-09-10 from data.gov.sg, made available under the Singapore Open Data Licence v1.0Contains information from URA Data Service — PMI_Resi_Transaction accessed on 2026-09-10, made available under the Singapore Open Data Licence v1.0

Where it sits in Choa Chu Kang505 blocks

S$472 psf puts this block in band 2 of 6 for Choa Chu Kang — 154 of 505 blocks with a filed median went for less.

Skip the map
S$388S$868median psf, six equal-sized groups in this town
Blk 421 Choa Chu Kang Ave 4 among 505 blocks in the same town. Outline: URA Master Plan planning area. Positions: OneMap. No distance or route is shown — only where things are. Shading is each block’s own median psf from its filed resales, in six equal-sized groups of this town.

What the floor is worth

This block—

Not enough filed sales at both ends of this block to compare it with itself. It needs 3 or more high and 3 or more low. The figure beside this one is the town, not here.

CHOA CHU KANG, typical block+13.2%

Middle of 18 blocks in CHOA CHU KANG that clear the bar — half fall between +3.1% and +15.2%. 3 came out negative — high floors sold for less in 3 of them.

Every band in CHOA CHU KANG, for reference. This pools all buildings in the town, so it carries the estates as well as the storeys — a town whose tall blocks are its newest ones will show a steeper climb than height alone buys. The two figures above are the ones that hold a building constant.

StoreysMedian psfFiled sales
01 TO 03S$469337
04 TO 06S$483417
07 TO 09S$499362
10 TO 12S$504307
13 TO 15S$519198
16 TO 18S$55776
19 TO 21S$60023

HDB Resale Flat Prices (data.gov.sg) · accessed 2026-09-10T21:08:48.055Z. Storey bands are the source's own — no floor number is inferred from them. A premium is a median of filed transactions, not a valuation of any home.

What's around

Straight-line distance from the building — the walk is longer, and how much longer depends on what is in the way.

Nearest station
South View
510m
Primary schools within 1km
3
nearest 463m
Primary schools · straight-line distance
  • Chua Chu Kang Primary School463m
  • Concord Primary School540m
  • South View Primary School615m
3 more between 1km and 2km
  • Teck Whye Primary School1.4km
  • De La Salle School1.5km
  • Kranji Primary School1.5km
A band is priority, not a place — and this is an indication, not MOE's answer. MOE measures home to school in a straight line, which is what is measured here. But it measures to the school's land boundary and this measures to the school's single registered coordinate, so a large campus reads as further away than MOE would find it. It also measures from the address on your child's registration, not from the block. A school near the line can fall either side of it once MOE measures it, and an oversubscribed school still ballots within a band. For the official category for a specific address, use OneMap's SchoolQuery.
Stations
  • South View510m
  • Choa Chu Kang519m
  • Choa Chu Kang556m
Also nearby
  • ParkChoa Chu Kang PK914m
  • Other schoolsBukit Panjang Govt. High School270m

Coordinates from OneMap, © Singapore Land Authority. Distances are straight-line.
Station exit locations — LTA (data.gov.sg), under the Singapore Open Data Licence. Accessed 2026-08-23.
School addresses — MOE School Directory and Information (data.gov.sg), under the Singapore Open Data Licence. Accessed 2026-08-23.
Park locations — NParks (data.gov.sg), under the Singapore Open Data Licence. Accessed 2026-08-23.

What has sold nearby300m

41blocks within 300m
$456–$503the middle half, per sq ft
$481median of those sales

From 242 filed sales — the 20 most recent at each block, which is all this index keeps.

BlockAwayFiledStoreySizePSF
Blk 418 Choa Chu Kang Ave 494m2026-0904–06106 sqm$469
Blk 437 Choa Chu Kang Ave 4259m2026-0910–12148 sqm$554
Blk 353 Choa Chu Kang Ctrl297m2026-0901–03108 sqm$452
Blk 427 Choa Chu Kang Ave 4148m2026-0810–12104 sqm$478
Blk 406 Choa Chu Kang Ave 3167m2026-0801–03104 sqm$482
Blk 414 Choa Chu Kang Ave 4172m2026-0801–03104 sqm$473
Blk 423 Choa Chu Kang Ave 456m2026-0710–12104 sqm$527
Blk 422 Choa Chu Kang Ave 458m2026-0701–03104 sqm$491
Blk 419 Choa Chu Kang Ave 492m2026-0707–09148 sqm$557
Blk 411 Choa Chu Kang Ave 398m2026-0701–03112 sqm$465
Blk 425 Choa Chu Kang Ave 4154m2026-0710–12104 sqm$503
Blk 414 Choa Chu Kang Ave 4172m2026-0701–03104 sqm$454
Blk 420 Choa Chu Kang Ave 478m2026-0604–06143 sqm$536
Blk 429 Choa Chu Kang Ave 4127m2026-0604–06133 sqm$458

The 14 most recent are listed, out of 242 in the index at this radius. The floor band is what URA and HDB publish; neither feed carries a unit number.

The afternoon sun, and what is approved in it247°–293°

NESW

Seen from here, the sun sets at 247° (WSW) in December and 293° (WNW) in June — a swing of 47° across the year. A window on one of those bearings takes the low sun for part of the year and none of it for the rest.

Today the sun drops below 15° at 06:04 pm and sets at 07:00 pm, arriving from 273° (W). Above that angle it is over the roof rather than through the window; near the equator the midday sun is almost overhead, which is why this is only ever about the last hour.

Nothing published says which way a unit points — not URA, not HDB. You are the one standing in it, or holding the plan. If the floor plan carries a north arrow, the plan reader will read it off and say so when it cannot.

Nothing with planning permission sits on those bearings within 400m. That is a fact about this radius and these bearings, not a guarantee of a view — an application not yet decided does not appear here, and neither does anything further out.

This does not tell you whether anything is blocked. A shadow needs the height and footprint of every building between you and the sun, and no public dataset here carries them — so none is drawn. What is above is the bearing the sun arrives on, which is astronomy, and what has been permitted along it, which is a filed decision with a reference number. Joining the two is yours. Bearings and distances are straight-line. A decision is permission to build, not a building: some are never started, and heights come from URA’s own wording, which states one about four times in five.
Hear when something is filed here

HDB publishes resale registrations by month, with a lag — so this tells you what the register now shows for Blk 421 Choa Chu Kang Ave 4, not what happened yesterday. Nothing goes out in a month when nothing was filed.

One click stops it, and stopping deletes the record rather than flagging it. Your address is never sold, never passed on, and never used for anything else. No phone number is asked for and none is stored.

Where the money actually goes

Drag the sale price. Everything moves.

Cash
Loan
CPF principal
CPF interest
Fees
Sale price · S$539,000
Outstanding loan
CPF principal used
Years held
Agent fee %
Sale priceS$539,000
Outstanding loan−S$180,000
CPF principal refundBack into your CPF, not lost−S$150,000
CPF accrued interestCPF OA rate, compounded over 12 years−S$52,416
Agent fee (2% + GST) and legal−S$14,550
Cash in handS$142,034
S$202,416 returns to your CPF, not your pocket — still yours, and it can fund the next purchase. The accrued interest alone is S$52,416, and it grows every year you hold. HDB concessionary loan interest is 2.6% p.a.; CPF Ordinary Account accrues at 2.5%.

Look up somewhere else

Any HDB block or private project in Singapore.