What Is GFA Harmonisation? What It Really Means for Condo Buyers

You will see the word “harmonised” on almost every new launch brochure since 2023. Almost none of them explain what it means — which is a shame, because it changes how you should read a price per square foot.

Here is a question worth sitting with. If two condominiums both quote 1,000 sqft and both quote $2,500 psf, are you getting the same thing?

Until recently, not necessarily. One of those 1,000 sqft could have included an air-conditioner ledge you can never stand on, and empty vertical air above a high ceiling. The other might not have. Same headline numbers, materially different homes.

That is the problem the Government’s floor area harmonisation was designed to fix. This article explains what actually changed, why it matters to your wallet, and — importantly — what the change does not mean, because there is a fair amount of loose marketing language around it.

What Changed, and When

In September 2022, the Urban Redevelopment Authority issued a circular harmonising floor area definitions across four agencies: URA, the Singapore Land Authority, the Building and Construction Authority and the Singapore Civil Defence Force.

Before this, those four agencies measured floor area differently, for their own purposes. That created confusion, duplicated work for architects, and — as a side effect — a gap that could be used commercially.

The new definition took effect on 1 June 2023. It applies to development applications submitted from that date, and to Government Land Sales sites launched from 1 September 2022. Projects that already had planning permission under the old rules were not affected.

Three changes matter to a buyer.

1. All strata area now counts as GFA

Gross Floor Area is what the Master Plan plot ratio controls — effectively, how much a developer is allowed to build on a site. Strata area is what you buy and what appears on your title.

Under the old rules these two did not fully overlap. Certain areas formed part of the strata area you paid for, but did not count towards the GFA the developer was allowed. Under the harmonised definition, all strata areas are computed as GFA, including previously uncovered areas.

2. Air-conditioner ledges

This is the change most people have heard about. Under the old rules, an AC ledge belonging to a unit could be sold as part of your strata area while being excluded from GFA, provided it stayed within a width limit.

The commercial logic was uncomfortable. A ledge cost very little to build, counted towards the square footage you paid for, and did not consume any of the developer’s precious plot ratio. Larger ledges were the rational response.

Under the harmonised definition, an AC ledge that forms part of a strata unit is computed as GFA. Developers who instead keep the ledges as common property can still exclude them — but then they are not part of your saleable area either. Either way, the incentive to oversize them is gone.

3. Void spaces

The other quiet one. In units with double-height ceilings, the empty vertical space above your head could be included in the strata area under some agencies’ measurements — square footage you paid for but could not furnish, walk on or use.

The harmonised rules exclude voids from the strata area computation.

Why This Changes How You Read a Price Per Square Foot

Here is the practical consequence, and it is the part almost nobody spells out.

A harmonised square foot and an unharmonised square foot are not the same unit of measurement.

In a harmonised project, the area quoted to you is closer to the area you can actually live in. In an older project, the same quoted number may include a ledge and some vertical air.

	Older project	Harmonised project
Quoted area	1,000 sqft	1,000 sqft
Includes AC ledge?	Possibly	Only if part of strata area
Includes void space?	Possibly	No
Usable area	Potentially less	Closer to the full figure

Illustrative comparison. The extent of any difference depends on the individual project and layout.

So when you compare a new harmonised launch against an older development at a similar psf, you are not comparing like with like. The harmonised project is quoting you a tighter, more honest number. On a true usable-space basis, its effective psf is better than the headline suggests.

This cuts the other way too. If a harmonised project’s psf looks higher than an older comparable, some of that gap is not a premium at all — it is the same home measured more strictly.

The comparison bites hardest when you are weighing a new launch against resale stock. Almost all resale inventory was built under the old definitions. A resale unit quoting a lower psf may be quoting it against an area that includes space you cannot use.

What Harmonisation Does Not Mean

Marketing language around this has run ahead of the facts in a few places, so it is worth being precise.

Harmonisation is not a feature of any particular project. It is a regulatory change that applies to every development whose application was made from 1 June 2023 onwards. A project being harmonised does not make it special — it makes it recent. Any new launch you are looking at today is likely to be harmonised.

It does not mean every square foot is perfectly usable. Balconies, private enclosed spaces and roof terraces still count towards strata area, as they have since earlier rule changes in 2009 and 2013. A harmonised unit can still carry a large balcony. Harmonisation tightened the definition; it did not eliminate outdoor space from the calculation.

It does not, by itself, make a project good value. Location, layout, tenure, developer and price still decide that. Harmonisation just means the ruler is more honest.

It is not a reason to avoid older properties. A well-located resale unit in a mature development may still be the better buy. The point is simply to compare the two on the same basis rather than on headline psf alone.

Why It Matters More at Higher Price Points

The arithmetic gets sharper as the price per square foot rises.

At prime central prices, a few per cent of unusable area is a meaningful sum of money. On a $3 million purchase, 5 per cent of the quoted area represents around $150,000 attributed to space that may not be usable. In a suburban project at half the psf, the same percentage costs materially less in absolute terms.

That is the honest reason to care about this most in the Core Central Region and the higher end of the Rest of Central Region: not that harmonisation applies differently, but that its financial effect scales with price.

How to Use This Practically

You do not need to become an expert in floor area definitions. You need three habits.

Check the vintage. Ask when the project’s planning application was made. Before June 2023 and after June 2023 are different measurement regimes.

Ask for the breakdown. A good salesperson can tell you how much of a unit’s quoted area is internal space, balcony, and anything else. If nobody can answer that, treat the number with more caution.

Compare usable to usable. When you shortlist two units, work out the furnishable area of each before you compare psf. It is a five-minute exercise that can reveal a difference worth six figures.

The Bottom Line

Floor area harmonisation was an administrative fix that turned into a consumer protection. By requiring all strata area to count as GFA, excluding voids, and removing the incentive for oversized air-conditioner ledges, it made the square footage you are quoted a closer match to the square footage you can use.

For a buyer, the useful takeaway is not to look for the word “harmonised” on a brochure. It is to remember that psf figures either side of 1 June 2023 are measured on different bases, and to ask what the usable area actually is before comparing anything.

The ruler changed. Make sure you are measuring both properties with the same one.

Sources: Urban Redevelopment Authority, Circular URA/PB/2022/09-DCG, “Harmonisation of Floor Area Definitions by URA, SLA, BCA and SCDF”, September 2022, effective 1 June 2023. Estimated impact on saleable area reflects industry commentary at the time of the change, not an official figure.

This article is provided for general information only and does not constitute financial, investment or legal advice. Floor area treatment varies by project and by the date of the planning application. Buyers should verify the strata area, usable area and applicable floor area basis of any specific unit with the developer and their own professional advisers before committing.