By Gary Lim · ERA Senior Division Director · CEA R009877B · Published 23 September 2026

HDB flat size, in one table

Ask what an HDB flat size is and you will be given a range. 4-room: 90 to 110 square metres. 5-room: 110 to 130. Those ranges are so wide they are useless — the difference between the bottom and the top of the 4-room range is an entire bedroom.

So I stopped asking and started measuring. Below are the actual floor areas of 2,549 HDB flats that changed hands in July and August 2026, across ten towns: Ang Mo Kio, Toa Payoh, Bedok, Queenstown, Bukit Merah, Punggol, Sengkang, Pasir Ris, Woodlands and Jurong West. Not brochure figures. Registered transactions.

Why every other page gives you a range

Because the label is old and the building standards are not. “4-room” has meant somewhere between 76 and 117 square metres in the flats that sold in just two months of 2026. That is a 54% spread inside one category.

The ranges are not wrong, they are just unhelpful. What matters is which 4-room you are being shown, and the single best predictor of that is when the block was built. That is where the interesting finding is.

The big one: HDB flat size grew, then shrank

You have heard the complaint that HDB flats keep shrinking. I have said versions of it myself at kitchen tables. It is half right, and the half that is wrong matters.

Here is the median floor area of every flat in my sample, grouped by the decade its lease started — which for HDB flats is effectively the decade it was handed over.

Read the 4-room column top to bottom. 90.5 → 103.0 → 103.0 → 91.0 → 93.0 → 93.0.

The 4-room lost a bedroom

Take the peak and today, and the comparison is stark.

Ten square metres is 108 square feet. That is a small bedroom, or a proper yard, or the difference between a dining table that seats six and one that seats four. It is not a rounding error, and anyone who has walked from a 1988 Bedok 4-room into a 2021 Punggol 4-room on the same afternoon has felt it without being able to put a number on it.

Now you can. It is ten square metres.

The executive flat lost more

The Executive is where the compression is sharpest: 147 square metres in the 1990s down to 130 in the 2000s, a loss of 17 square metres or 183 square feet. And HDB stopped building them altogether, so there is no 2010s or 2020s row to put beside it.

That has a consequence people underrate. The supply of large HDB flats is fixed and ageing. Every executive flat and maisonette in Singapore is now at least in its twenties, most are considerably older, and none will ever be replaced. If your requirement is genuinely 150 square metres of public housing, you are shopping in a closed pool with a shortening lease — which is exactly the tension I worked through in my piece on executive maisonette prices.

The only type that got bigger

One type moved the other way. The 2-room went from 43 square metres in the 1960s to 47 today — small in absolute terms, but a 9% gain, and the only positive number in the table.

That is the 2-room Flexi doing its job. The old 2-room was emergency housing. The modern one is designed as a retirement product and a singles product, and it shows in the floor plan. It is a genuine, if quiet, policy success.

What the missing 10 square metres is worth

Across these ten towns the median 4-room traded at about $633 per square foot in July and August 2026. So the ten square metres that an 1980s or 1990s 4-room has and a modern one does not is worth:

Before anyone emails me: this is not a claim that an old flat is worth $68,160 more than a new one. It obviously is not — the older flat has thirty or forty fewer years of lease, and lease is worth far more than floor area. The point is narrower and it is about how you read a listing.

HDB flat size by town: a 19% difference under one label

Now the part that is immediately useful if you are searching this week. The same “4-room” label means very different things in different towns, because towns were built in different decades to different standards.

Pasir Ris 105 square metres. Queenstown 88. Same label, 17 square metres apart — a 19.3% difference, or 183 square feet, for a flat that is described identically on every portal in the country.

That is the single most actionable line on this page. If space is your priority and you are flexible on location, the east and the north-west are handing it to you: Pasir Ris, Jurong West and Woodlands all median 100 square metres or above on the 4-room, and all three are among the cheaper towns per square foot. Queenstown gives you the smallest 4-rooms in the sample at the highest price per square foot ($1,099). You are paying the most, per foot, for the fewest feet. That is a rational trade if you want the location. It is a terrible one if you thought you were buying space.

Punggol’s 199 sales and the zero

One cell in that table deserves its own paragraph, because it is the cleanest illustration of how tightly modern building standards bind.

Punggol registered 199 four-room resales in July and August 2026. Not one of them was 100 square metres or larger. Not a single flat out of 199. The entire town’s 4-room stock sits at 93 square metres or below, because the entire town was built after the standard settled.

Pasir Ris, built a generation earlier, has 78.2% of its 4-room sales at 100 square metres or more.

So “new town” is a reliable proxy for “smaller flat”, and the proxy is nearly absolute at the extremes. If you are a young family choosing between a resale flat in Punggol and one in Pasir Ris and space is the priority, that is the finding: Pasir Ris is not slightly bigger, it is categorically bigger.

Does a bigger HDB flat size mean a lower price per square foot?

This is the belief that drives half the size-hunting in the market, so I tested it on this data too.

I took only 4-room flats with leases starting between 1980 and 1999 — holding the vintage roughly constant, so I am comparing big old flats against small old flats rather than old flats against new ones. Then I split them by size.

The middle band is the cheapest per square foot and the largest band is dearer than it. The correlation between floor area and price per square foot across all 324 of those flats is −0.140 — technically negative, practically nothing. A correlation that weak explains about 2% of the variation in psf.

So no: within a vintage, bigger HDB flats are not meaningfully cheaper per square foot. This matches what I found separately when I compared 4-rooms against 5-rooms in the same block, where the supposed size discount also disappeared the moment the comparison was made fairly. Two different tests, same answer. The size discount is a mix effect, not a real one.

Where a real size discount does show up is at the genuinely unusual end — the enormous flats, where the buyer pool collapses. That is the pattern in the jumbo flats, which are two units knocked together and sell at a visible discount per square foot precisely because almost nobody needs 1,700 square feet of public housing.

The biggest and smallest flats sold

The extremes in two months of ten-town data are worth seeing, because they define the actual range of Singapore public housing.

Two things worth noticing. First, the largest flats in the country are in Woodlands, not in any prime town — 1994-vintage executive apartments at 2,067 square feet, selling for $1.07m to $1.25m. That is 2,000 square feet of freehold-feeling space for the price of a small condo, on a lease that still has most of its life.

Second, and this is the one that stops people: that 31 sqm one-room flat sold for $279,000, which works out to $835 per square foot. The smallest flat in the sample trades at a higher price per square foot than the median 4-room in eight of my ten towns. Small is expensive per foot. It always has been.

Checking my numbers against 2018

I do not like publishing a number nobody can check, so here is an independent cross-reference. EdgeProp ran an island-wide study of large HDB flats in August 2018 and found an average 4-room of about 1,027 sq ft, with the largest 4-rooms in Pasir Ris at about 1,139 sq ft.

My 2026 numbers, computed from a completely different dataset by a different method: median 4-room 1,001 sq ft across ten towns, with Pasir Ris the largest at 105 sqm, or 1,130 sq ft.

Eight years apart, different samples, and Pasir Ris comes out on top both times within nine square feet. That is about as good a corroboration as this kind of work gets, and the credit for spotting the Pasir Ris effect first belongs to EdgeProp, not to me. What their piece does not have is the era breakdown or the current medians — it is eight years stale and quoted in square feet only. That is the gap this page fills.

How this squares with HDB’s own figures

HDB publishes nominal floor areas for current BTO types, generally given as 3-room 60–68 sqm, 4-room 85–95 sqm and 5-room 107–113 sqm.

My measured medians for post-2000 stock — 4-room 93 sqm, 5-room 113 sqm, 3-room 67–68 sqm — sit inside those bands, near the top of each. That is a good sign: the brochure and the registry agree for modern flats.

But look what it means for the older stock. The 1980s and 1990s 4-room at 103 square metres sits entirely above HDB’s current nominal band. A flat that large is not a big modern 4-room. It is a different product that HDB no longer builds, and it is only available second-hand.

What to do with this if you’re buying

Four practical moves, in the order I would use them.

1. Ask for the square metres before the asking price. Every listing carries it and almost nobody reads it. A 103 sqm 4-room and a 93 sqm 4-room are 108 square feet apart, and at the going rate that is roughly $68,000 of value sitting in a field most buyers skip over.

2. Use the era as your filter. If you want a big flat, lease commencement in the 1980s or 1990s is the shortcut. If you want a long lease, you are accepting the modern footprint. You do not get both, and pretending otherwise wastes months of viewings.

3. Let the town do the work. Pasir Ris, Jurong West and Woodlands are where the large 4-rooms actually are. If you have been searching Queenstown for a spacious 4-room, the stock is not there — its median is 88 sqm, the smallest in my sample.

4. Price per square foot, not per flat. Once you know your flat is around a thousand square feet, psf becomes easy mental arithmetic and the comparisons get honest fast. If you want a professional read on where a specific unit sits, that is what my HDB valuation guide walks through, and you can run your own affordability and stamp duty numbers at listings.sg/tools before you start viewing.

Who should chase HDB flat size, and who shouldn’t

FAQ

How big is a 4-room HDB flat in square feet?

The median 4-room that sold in July and August 2026 was 93 square metres, which is 1,001 square feet. The full range in that sample ran from 76 to 117 square metres, so individual flats vary by more than half.

What is the size of a 5-room HDB flat?

Median 114 square metres, or 1,227 square feet, across 640 sales. The smallest was 99 sqm and the largest 149 sqm. Flats built in the 1990s median 123 sqm against 113 sqm for those built since 2010.

Are HDB flats getting smaller?

Compared with the 1980s and 1990s, yes. The 4-room fell from a median 103 sqm to 93 sqm, a loss of 10 sqm or 9.7%. Compared with the 1970s, no – the 1970s 4-room median was 90.5 sqm, slightly smaller than today. Flats grew, plateaued, then came back down.

Which town has the biggest HDB flats?

Of the ten towns measured, Pasir Ris, with a median 4-room of 105 sqm and 78.2% of its 4-room sales at 100 sqm or larger. Jurong West and Woodlands both median 100 sqm. Queenstown is the smallest at 88 sqm.

How big is a 3-room HDB flat?

Median 67 square metres, or 721 square feet, across 527 sales. Queenstown’s 3-rooms are the smallest at a median 63 sqm, reflecting its older stock.

What is the biggest HDB flat you can buy?

In this two-month sample the largest sale was 192 square metres, or 2,067 square feet: an executive apartment at Blk 807 Woodlands St 81 with a lease from 1994, which sold for $1,250,000. Executive flats are no longer built, so the supply of very large HDB flats is fixed and ageing.

Do bigger HDB flats cost less per square foot?

Not meaningfully. Among 4-room flats with leases starting between 1980 and 1999, the correlation between floor area and price per square foot is minus 0.140, which explains about 2% of the variation. The apparent size discount in national figures comes from the mix of towns and vintages, not from size itself.

Where do these HDB flat size figures come from?

From 2,549 HDB resale registrations in July and August 2026 across Ang Mo Kio, Toa Payoh, Bedok, Queenstown, Bukit Merah, Punggol, Sengkang, Pasir Ris, Woodlands and Jurong West, taken from HDB’s resale registry published on data.gov.sg. Every floor area here is a registered transaction, not a brochure figure.