Key Takeaways
- GFA harmonisation took effect on 1 June 2023 and standardised floor area definitions across URA, SLA, BCA, and SCDF.
- Post-harmonisation condos exclude void spaces and common-property air-con ledges, so listed sizes are smaller but reflect actual usable space.
- New launch PSF appears higher under the new rules, but the total quantum price is often comparable because buyers no longer pay for non-functional space.
- Older resale condos launched before June 2023 keep their original measurements, which can mean larger floor plans but lower space efficiency.
- Buyers in 2026 should compare effective PSF and quantum rather than headline PSF when weighing pre- and post-harmonisation units.
Expert takeaway: GFA harmonisation did not make new condos more expensive overnight. It changed what counts as saleable space, so post-2023 units look smaller and pricier on a per-square-foot basis even when the total cost and usable space are broadly comparable to older projects.
If you have toured a new launch in 2026 and felt that a three-bedder seemed strangely compact next to a similar resale unit, you are not imagining it. A quiet 2023 rule change called GFA harmonisation has reshaped how Singapore measures, prices, and markets homes. For buyers comparing a glossy new launch against an older resale condo, understanding this shift is now essential to judging real value rather than headline numbers.
What GFA Harmonisation Actually Changed
Gross Floor Area, or GFA, is the metric behind every condo brochure and valuation. Before mid-2023, Singapore's agencies each measured it differently. URA used GFA to gauge building intensity, the Singapore Land Authority used strata area to demarcate ownership, BCA used statistical gross floor area, and SCDF used accessible floor area for fire safety. URA's harmonisation circular unified these definitions.
The inconsistencies were real. URA previously measured GFA to include the full thickness of external walls but excluded voids, whereas strata area was measured only to the middle of the wall and could include voids. The harmonised rules took effect for development applications submitted on or after 1 June 2023.
Three changes matter most to buyers:
- All floor areas are now measured to the middle of the wall, creating one consistent standard across agencies.
- All strata (saleable) areas are included in GFA, so developers can no longer pad GFA with bonus features without it counting.
- Voids are excluded from strata area, meaning developers can no longer charge buyers for empty vertical air space in high-ceiling units.
In practice, that means the air-con ledges, planter boxes, and double-volume voids that once inflated a unit's listed size are now treated as common property or excluded entirely. The first private residential project launched under this framework was Lentor Mansion, and the rules have since become the standard for all subsequent launches.
How GFA Harmonisation Affects New Launch Prices and PSF
Here is the part that confuses buyers most. Because non-functional space is stripped out, the sellable floor area in new condos is smaller, which pushes up the per-square-foot value. But the total quantum price can stay broadly similar, because you are no longer paying for space you cannot use.
A widely cited industry comparison illustrates this well. A three-bedroom unit at the pre-harmonisation Tembusu Grand was listed at 1,173 sqft, while the comparable layout at post-harmonisation Emerald of Katong measured 969 sqft. Despite the higher PSF, the Emerald of Katong unit was priced lower on quantum, showing that a higher PSF does not automatically mean a worse deal.
| Feature | Pre-Harmonisation (before 1 June 2023) | Post-Harmonisation (from 1 June 2023) |
|---|---|---|
| Air-con ledges | Often counted in saleable strata area | Typically common property, excluded from GFA |
| Strata voids (high ceilings) | Could be included in listed size | Excluded from strata area; not saleable |
| Listed size | Larger, includes non-functional space | Smaller, reflects usable floor plate |
| Headline PSF | Appears lower | Appears higher |
| What you pay for | Floor plus padding | Floor you can walk on |
Industry observers note that air-con ledges historically accounted for roughly 4% to 5% of a unit's saleable area, and developer efficiency ratios that once hovered near 99% to 100% were expected to settle around 95% after the new rules. The upshot for buyers: a 900 sqft post-2023 unit is effectively more usable than a 900 sqft pre-2023 unit that bundled in ledges and voids.
Why This Matters for Resale Buyers and Sellers
The most overlooked consequence sits in the resale market. Older condos launched before June 2023 keep their original measurements, so they often show larger listed floor areas. On a portal, that can make them look cheaper per square foot than a new launch nearby.
That comparison is misleading if you do not adjust for usable space. An older unit's lower PSF may reflect inefficient design rather than genuine value. At the same time, some older homes with generous terraces, high ceilings, or volume that could not be replicated under harmonised rules may hold a distinct appeal for buyers who prize openness over compact efficiency.
For anyone weighing an upgrade, this distinction ties directly into how you read pricing across the market. If you are moving from a flat, our guides on upgrading from HDB to condo without paying ABSD and the step-by-step guide to buying a new launch condo walk through the practical decisions. Buyers should also revisit how TDSR and LTV limits shape borrowing capacity, since quantum, not PSF, drives your loan and stamp duty.
Opportunities and Risks Buyers Should Weigh in 2026
GFA harmonisation brings clear benefits, but it is not a one-way win for every buyer.
Opportunities:
- Transparent pricing. Listed sizes for post-2023 projects more closely match the space you can actually use, giving a cleaner baseline for comparison.
- Smarter layouts. With void space excluded and ledges treated as common property, developers are designing more efficient, functional interiors rather than padding square footage.
- Value hunting in resale. Older units with genuine volume and well-used space can become relatively attractive, especially when buyers learn to read effective PSF.
Risks:
- PSF sticker shock. Headline PSF on new launches looks higher, and buyers who anchor on that figure alone may wrongly assume new launches are overpriced.
- Apples-to-oranges errors. Comparing a pre-2023 resale unit to a post-2023 launch without adjusting for non-usable space can lead to poor decisions, on either side.
- Smaller listed sizes. Some buyers may feel they are getting less, even when usable space is comparable, which can affect resale perception and negotiation.
For investors in particular, the lesson is to evaluate quantum, layout, and rental functionality rather than fixating on PSF. Our pieces on developer and agent tactics at launches and common mistakes buyers make during previews cover how PSF framing is used in sales pitches. Understanding stamp duty on the quantum rounds out the true cost picture.
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Does GFA harmonisation apply to older resale condos?
No. The harmonised definitions apply to development applications submitted to URA on or after 1 June 2023. Existing properties retain their original strata definitions, which is why older resale units may show larger listed floor areas than comparable new launches.
Are new launch condos genuinely more expensive because of GFA harmonisation?
Not necessarily. The headline PSF is higher because non-functional space such as voids and common-property air-con ledges is excluded, so the listed size is smaller. The total quantum price is often comparable to older projects once you account for the space you no longer pay for.
Are balconies still counted as saleable space?
Yes. Balconies remain part of GFA and saleable strata area under the harmonised rules, though the measurement is now standardised to the middle of the parapet wall. URA's existing balcony size limits remain in place to protect spatial quality.
How should I compare a pre-2023 resale unit with a 2026 new launch?
Look beyond headline PSF. Calculate effective PSF based on actual usable space, compare total quantum prices, and study the floor plan for layout efficiency. An older unit that looks cheaper per square foot may include planter boxes, oversized ledges, or voids that inflate its listed size.
Does GFA harmonisation also apply to Executive Condos?
Yes. Current EC launches follow the harmonised rules, which means listed sizes reflect usable space. This benefits mass-market buyers managing tighter budgets, since every dollar goes toward functional area. You can review eligibility details on the HDB EC eligibility page.
GFA harmonisation is, at heart, a transparency reform. It rewards buyers who read floor plans carefully and compare effective PSF and quantum rather than reacting to headline figures. But the transitional market of 2026, with pre- and post-harmonisation projects sitting side by side, is exactly where costly misjudgements happen. If you are weighing a new launch against a resale unit, or trying to work out whether a higher PSF is justified for your budget and goals, the team at PropertyNet.SG can help you cut through the numbers with an independent, data-grounded view. Reach out for a personalised consultation before you commit to your next home.