How much of your condo can you actually live in? The year it was approved decides.

Two condos can list the same square footage and the same price per square foot, and one of them is a much better home than the other. The difference is usually not the developer's taste. It's the year the project was approved, and which URA rules were in force when the architect drew it. Over roughly fifteen years, the Urban Redevelopment Authority rewrote what counts as floor area in a Singapore condo, and each change fed straight into the layouts, unit sizes and prices on sale today.

This is the long version: every circular that matters, in order, with the reason URA gave for it, what it did to the floor plan, and what it means when you compare two units. Keep one fact in your pocket as you read, the rule that drew a unit is the rule in force when the development's plans were approved, not when it was sold or when you're buying it. A 2008-approved project that only launched in 2011 was drawn under the old rules.

Sources: URA development-control circulars (cited by number in each section below) and the joint URA/SLA/BCA/SCDF floor-area harmonisation circular. As at June 2026.

Why floor area is the whole game

A condo developer buys land with a fixed budget of Gross Floor Area (GFA), the plot ratio times the site area sets a hard ceiling on how much floor the project can have. Every square metre of GFA is paid for in the land price. So the developer's standing incentive is to find space they can sell to you that doesn't count against their GFA budget: space that is free to them but billed to you at full price per square foot.

For years, URA's own rules created those free spaces: bay windows, planter boxes, generous balconies, air-con ledges, private enclosed spaces, even airspace voids. Developers built as many of them as the rules allowed, because each one inflated the strata area, what you legally buy and pay PSF for, without consuming the GFA they paid the government for. The history below is URA closing these gaps one at a time, leaving condos with cleaner layouts and listed sizes that track the space you can actually use.

Strata area vs GFA, the two numbers, and why they used to disagree

To read any of this, you need to keep two numbers apart.

• GFA (Gross Floor Area) is URA's planning measure. It is what the developer's plot-ratio budget is spent on, and it is what determines how much building is allowed on a site.
• Strata area is SLA's ownership measure. It is the number on your floor plan, in your Sale and Purchase Agreement, and on your title, and it is the number you pay PSF for.

For most of Singapore's condo history these two were calculated on different bases. Before June 2023, URA measured GFA to the full thickness of the external walls and excluded voids; SLA measured strata area only to the middle of the wall and could include voids (URA circular DC22-09, Appendix 1, https://www.ura.gov.sg/Corporate/Guidelines/Circulars/dc22-09). Two different numbers described the same unit. More importantly, certain spaces could sit inside your strata area, so you paid for them, while sitting outside

The timeline

~2001, The balcony era begins

A URA scheme introduced in 2001, the Balcony Incentive Scheme (BIS), gave developers bonus GFA, extra buildable floor above the plot-ratio ceiling, for balconies, and over time for private enclosed spaces (PES) and roof terraces, up to about 10% of the site's GFA. The intent was to encourage breezy, outdoor-connected homes and high-rise greenery. The effect was that balconies became a developer's favourite square footage: floor they got granted cheaply and sold at full PSF. It is why condos from the 2000s and 2010s so often carry large, sometimes oversized, balconies.

The scheme went through four distinct phases over the next two decades: the 2001 launch (PES and roof terraces fully GFA-exempt at the time); revised balcony guidelines in 2007; the bringing of PES and roof terraces into the bonus pool in 2013; and the tightening in 2019 that cut the cap and added per-unit limits. Each phase is covered below.

The scheme dates to 2001, URA's later circular DC18-07 records that the Balcony Incentive Scheme was "introduced in 2001" (https://www.ura.gov.sg/Corporate/Guidelines/Circulars/dc18-07), and the ~10% bonus is set out in URA's Bonus GFA guidelines. The 2001 scheme predates a published circular number. A revised set of balcony guidelines followed in 2007 (URA circular reference URA/PB/2007/01-DCD), which later versions built on.

1 January 2009, The bay-window and planter-box cleanup (the big one)

This is the change that most cleanly splits "old" condos from "newer" ones. Before 2009, bay windows, the raised ledges projecting from bedroom and living-room walls, and in-unit planter boxes, the sunken troughs outside windows and balconies, were excluded from GFA entirely. They cost the developer nothing in land, but were sold to you inside the strata area at full price.

Why bay windows were exempt in the first place. URA originally treated a bay window as a raised window ledge sitting above the floor slab, an architectural feature, not usable living space (URA circular DC08-17, background, https://www.ura.gov.sg/Corporate/Guidelines/Circulars/dc08-17). On that logic it sat outside the floor-area count. The problem was that, year by year, the allowed ledge height was relaxed, eventually to as little as 0.5 m above the floor. At that point the "ledge" was functionally indistinguishable from ordinary floor: you could sit on it, place furniture against it, or turn it into a study nook. The distinction that had justified the exemption had quietly disappeared (DC08-17).

URA's three stated reasons for removing it. URA gave notice in a July 2008 circular, DC08-17

29 July 2009, One bonus budget, capped

Right after the cleanup, URA's DC09-03, the "Framework for Managing Bonus GFA Incentives," published 29 April 2009 with the cap taking effect 29 July 2009, put every bonus-GFA scheme, balconies, green features and the rest, under a single ceiling: total bonus GFA could not exceed 10% of the site's allowable Master Plan gross plot ratio. That stopped developers from stacking multiple incentives to push a project beyond the cleanup's intent. It is plumbing rather than a layout change, but it is why "bonus area" in any condo since has a hard limit.

One feature of this framework matters at the other end of a building's life: bonus GFA does not carry forward on redevelopment. When a site is eventually torn down and rebuilt, its development potential reverts to the base Master Plan plot ratio, the bonus is a one-generation entitlement for the specific building, not a permanent uplift to the land's value (DC09-03).

Source: URA circular DC09-03, "Framework for Managing Bonus GFA Incentives" (https://www.ura.gov.sg/Corporate/Guidelines/Circulars/dc09-03).

12 January 2013, Private enclosed spaces get reined in

Private Enclosed Spaces (PES), typically the ground-floor patios attached to first-storey units, and the equivalent Private Roof Terraces (PRT) at the top of a building, were among the most exploited free area of all. Before January 2013 a PES or PRT counted as neither normal GFA nor bonus GFA: invisible to URA's budget, yet sold to buyers as strata area. URA's DC13-01 ended that, folding PES and PRT into the same 10% bonus-GFA pool that balconies use. Developers could no longer hand out unlimited free outdoor space, and ground-floor PES units stopped being the quiet margin machine they had been.

The change was not retroactive. PES and PRT approved before 12 January 2013 are grandfathered, they are not counted towards the development's GFA, and URA's current guidance still says so explicitly (https://www.ura.gov.sg/Corporate/Guidelines/Development-Control/Residential/Flats-Condominiums/Balconies-PES-PRT). So a ground-floor patio on a 2010 project and one on a 2015 project may look identical and yet have completely different histories on the developer's GFA ledger.

Source: URA circular DC13-01, effective 12 January 2013 (https://www.ura.gov.sg/Corporate/Guidelines/Circulars/dc13-01); grandfathering and current PES/PRT rules per the URA Flats-and-Condominiums guidelines page.

2013–2014, Balconies tied to build quality

Two URA circulars, DC13-10 (effective 1 November 2013) and DC14-27 (effective 9 December 2014), made the balcony bonus conditional. Issued jointly with BCA, DC13-10 set up a two-tier system: a developer could claim up to 3% additional GFA for balconies if the project met a baseline buildable-design score, and up to the full 10% only if it also adopted more productive construction methods such as drywall and prefabricated bathroom units. Developers applied to BCA first, then URA, and lodged a security deposit that was forfeit if the productivity conditions were not met by completion. DC14-27 then adjusted the second-tier conditions of that scheme.

This is less about your layout and more about why so many condos from the mid-2010s onward are built from precast modules. The carrot of bonus balcony area was used to modernise how Singapore builds.

Sources: URA circulars DC13-10 (effective 1 November 2013, https://www.ura.gov.sg/Corporate/Guidelines/Circulars/dc13-10) and DC14-27 (effective 9 December 2014, https://www.ura.gov.sg/Corporate/Guidelines/Circulars/dc14-27) on balcony bonus and buildability.

17 January 2019, The shoebox curb (the 85 sqm rule)

The shoebox boom of 2011–2012, tiny sub-500 sqft units packed into outside-Central-Area sites, prompted URA to cap how many units a developer could squeeze from a site. The control is a divisor: maximum units = GFA divided by a set figure.

• URA's DC11-14 (issued 23 November 2011) and a 2012 expansion, DC12-13, set that figure at 70 sqm for non-landed developments outside the Central Area.
• URA's DC18-06, effective 17 January 2019, raised it to 85 sqm outside the Central Area, and to a stricter 100 sqm in nine established estates: Marine Parade, Joo Chiat–Mountbatten, Telok Kurau–Jalan Eunos, Balestier, Stevens Road–Chancery, Pasir Panjang, Kovan–How Sun, Shelford and Loyang.

*This is a cap on unit count, not a minimum on unit size. This is the single most misunderstood rule on this page, so it is worth being precise. Dividing a fixed GFA by a larger number simply permits

17 January 2019, Balcony bonus cut to 7%, and capped per unit

The same week, URA's DC18-07, its "Revision to the Balcony Incentive Scheme", made the most consequential balcony changes since 2001. It cut the bonus-GFA cap for balconies, PES and PRT combined from 10% to 7% of the development's residential GFA. URA's reason was that some projects had "excessively large balconies in relation to the size of the indoor spaces of a unit," and that buyers who didn't want a balcony struggled to find a unit without one (https://www.ura.gov.sg/Corporate/Guidelines/Circulars/dc18-07).

The same circular added several rules that shape every post-2019 balcony you will see:

• A per-unit balcony cap. Total balcony area in any single unit may not exceed 15% of that unit's net internal area (excluding voids, balconies, AC ledges and other external areas), and each balcony must be at least 1.5 m wide. This is what ended the era of cavernous balconies eating a fifth or more of a unit.
• A no-balcony option. Developers must offer at least some units with no balcony, PES or PRT, protecting buyers who would rather have the indoor space.
• An openness test for the bonus. To earn the bonus at all, a balcony must keep a continuous perimeter opening of at least 40%; parapet walls up to 1.3 m between adjoining units' balconies still count as "open." A balcony screened or enclosed past that threshold loses its open-balcony status and counts as ordinary indoor GFA against the base plot ratio, not the bonus budget.
• Disclosure at the showflat. Any approved balcony screen design must be shown at actual scale in the sales gallery and disclosed to buyers up front, so a buyer knows exactly what enclosure is and isn't permitted.

5 July 2019, A technical tidy-up (DC19-11)

Six months after the big 2019 changes, URA issued DC19-11, refining how GFA is calculated for sky terraces, pedestrian linkages, balconies and mechanical-and-electrical spaces, with immediate effect. The refinements were procedural, aimed at clearer, more objective measurement for the architects and engineers who submit plans, not at changing what a buyer experiences. It included a "credit" mechanism: floor space previously approved as GFA but no longer counted under the refined rules could offset additional floor space in amendment submissions. Buyer-facing impact is negligible; it is listed here for completeness, because plans submitted from 5 July 2019 follow this slightly tighter regime.

Source: URA circular DC19-11 (effective 5 July 2019, https://www.ura.gov.sg/Corporate/Guidelines/Circulars/dc19-11).

2020, One handbook to replace the pile of circulars (DC20-07)

For decades, the rules above lived scattered across dozens of circulars, each amending the last. In 2020, URA's DC20-07 published a consolidated GFA Handbook, a single, public online reference that lists every architectural element alphabetically (bay windows, balconies, ledges, planter boxes, PES, PRT, voids, RC slabs within voids, floors under pitched roofs, and more) and states, with diagrams, whether each counts as GFA and under what conditions. The handbook does not change any rule; it makes the cumulative history navigable, and it is updated in place, its pages now carry "last updated" dates in late July 2023, reflecting the harmonisation changes below. For anyone trying to verify the rule that was in force when a particular project was approved, the handbook is the authoritative starting point (https://www.ura.gov.sg/Corporate/Guidelines/Circulars/dc20-07).

Source: URA circular DC20-07, "New Handbook on Gross Floor Area (GFA) and New Landed Housing E-Advisor" (2020).

18 January 2023, The Central-Area unit-size floor

The 85 and 100 sqm average rules never applied to the Central Area, where small units kept proliferating. URA's DC22-10, issued in October 2022 (effective 18 January 2023), addressed that: in the 11 Central-Area planning zones, Outram, Museum, Newton, River Valley, Singapore River, Marina South, Marina East, Straits View, Rochor, Orchard and Downtown Core, at least 20% of a development's units must have a net internal area of 70 sqm or larger. Studios are still allowed; the rule sets a floor on the share of bigger units, not a ceiling on small ones. At least one in five units in a new city-centre project must be family-sized. Outside the Central Area, DC22-10 carried forward the existing 85/100 sqm divisor and the 20%/20% mix rule unchanged, it consolidated the framework and extended it downtown rather than replacing it.

Source: URA circular DC22-10, issued 18 October 2022, effective 18 January 2023 (https://www.ura.gov.sg/Corporate/Guidelines/Circulars/dc22-10).

1 June 2023, Floor-area harmonisation (the "shrinking strata area")

The most recent and most misread change. For decades, four agencies measured floor area on different bases for the same building, a genuine mess that forced architects to compute multiple sets of areas and left homeowners confused. Before June 2023 there were at least four definitions in play:

1. URA GFA, measured to the full thickness of external walls, voids excluded.
2. SLA strata area, measured to the middle of the wall, voids optionally included.
3. BCA/SCDF Statistical GFA (SGFA), measured to the middle of the wall.
4. SCDF Accessible Floor Area (AFA), measured to exclude wall thickness entirely.

DC22-09, a landmark circular co-signed by URA, SLA, BCA and SCDF, aligned them. It made four headline changes (DC22-09, para 5, https://www.ura.gov.sg/Corporate/Guidelines/Circulars/dc22-09):

• (a) Everyone measures to the middle of the external wall. URA dropped its full-wall-thickness convention; a 50 mm offset is allowed where wall thickness changes, matching long-standing SLA practice.
• (b) All strata area counts as GFA. Whatever SLA says is yours is now also spent from the plot-ratio budget, closing the gap that let some strata space sit outside GFA. This is what brings exclusive AC ledges into GFA: if an AC ledge is part of your strata unit, it now counts; if the developer keeps it as common property, it stays exempt up to 2.0 m width (treated like a standard RC ledge). It also closes the "strata car park" loophole, uncovered areas assigned to a strata lot, like a private car park space, now count too.

How to read a floor plan, by era

A practical cheat-sheet from the timeline. First find the year, look for the planning-permission date or launch year on the sales brochure, or check the project's transaction history. Then apply the era:

• Built before 2009: expect bay windows (rectangular ledges protruding from bedroom/living walls, often labelled "BW" or "Bay Window") and planter boxes (hatched troughs by windows and balconies, often "Planter" or "PL"). Both are inside the listed area you pay PSF for, but neither is furnishable living space. Mentally subtract them to get the real efficiency.
• 2009–2018: cleaner walls, but often large balconies (the up-to-10% bonus era) and AC ledges still inside the strata area you pay for. A chunk of "your" square footage may be outdoor or ledge. From 2013, ground-floor PES and roof-level PRT also sit in the bonus pool, fine to enjoy, but check whether a big patio or terrace is driving up the quoted size.
• 2019 onward: larger average units (the 85 sqm rule), smaller balconies (7% bonus, and capped at 15% of net internal area per unit, minimum 1.5 m wide), and fewer studio-only projects.
• From mid-2023: AC ledges and voids no longer pad the listed size, so a smaller number here can mean more usable home than a bigger pre-2023 one.

The most useful single move, in any era: ask the agent or developer to break the quoted strata area into (a) net internal area, the enclosed, air-conditioned living space, and (b) everything else, balcony, PES, PRT, AC ledge, bay window, planter. The PSF that matters for daily life is the one on (a).

A worked example: a 2007 unit vs a post-2023 unit

Take two three-bedders that both list at, say, 1,100 sqft, both quoted at the same PSF. (The figures here are illustrative, to show how the rules interact, not URA numbers.)

The 2007 unit was drawn under the old rules. Its 1,100 sqft includes a bay window in each of the three bedrooms and the living room, plus a couple of planter boxes off the balcony, none of which counts against the developer's GFA budget, all of which you pay PSF for. It also has a generous balcony from the up-to-10% bonus era and an AC ledge folded into the strata area. Add the bay windows, planters, ledge and oversized balcony together and a meaningful slice of that 1,100 sqft, in the most padded older units, approaching a quarter, is ledge, trough, outdoor or unusable space. The liveable floor behind the headline number is smaller than it looks.

The post-2023 unit was drawn after harmonisation. Its 1,100 sqft is measured to the middle of the walls, excludes any void, and, if the developer kept the AC ledge as common property, excludes that too. Its balcony is capped at 15% of net internal area. Almost all of the 1,100 sqft is genuinely usable interior plus a modest, controlled balcony. If anything, a post-2023 unit that lists smaller