Think Twice About Rebuilding That Old Landed Property Into a Super-Big House to Max Out GFA

For many landed homeowners in Singapore, the instinct when rebuilding an ageing property is to push the gross floor area (GFA) to its permissible limit. As Leslie Yee writes in his column “The Level Ground,” building super-big is often the guiding mantra. Yet the arithmetic of going large does not always add up.

As at Q1 2026, Singapore’s private housing stock comprised 73,662 landed homes, broken down into 10,766 detached houses, 22,462 semi-detached houses and 40,434 terrace houses. The remainder of the private housing universe stood at 350,503 condominiums and apartments, excluding executive condominiums. These landed homes sit at the apex of the residential market, offering the rare promise of full customisation on freehold or 999-year land.

Yee illustrates the cost dynamics with a concrete example. Consider an old terrace house on a 1,700-square-foot plot purchased for S$3.4 million. If the owner demolishes and rebuilds to the maximum permissible floor area of about 4,600 square feet, the construction bill comes to roughly S$2.5 million. That brings the total outlay to S$5.9 million, which works out to about S$1,283 per square foot (psf) of floor area.

Now consider a more restrained approach: demolishing and rebuilding a smaller home of 3,000 square feet on the same plot. With construction costs of about S$1.6 million, the total comes to S$5 million, or roughly S$1,667 psf of floor area. That is about 30 per cent higher on a per-square-foot basis.

On the surface, the bigger build looks more capital-efficient. But Yee cautions that the calculation changes once you factor in recurrent costs, practical utility and the risk of construction cost escalation. Building costs could climb further given the ongoing energy crisis sparked by conflict in the Middle East, making the larger project a bigger gamble.

A larger home does not just cost more to build; it costs more to keep. Owner-occupied residential property tax rates in Singapore are progressive, ranging from 0 per cent to 32 per cent. The first S$12,000 of annual value (AV) is taxed at 0 per cent, but once AV exceeds S$140,000, the marginal rate hits 32 per cent. A sprawling rebuild with a higher AV will face steeper annual tax bills for as long as the owner holds the property, eroding the apparent capital savings from building big.

There is also the question of who will actually use all that space. The average household size in landed properties fell to 4.13 persons in 2025, down from 4.3 persons in 2015. With families getting smaller, a maximum-GFA build may leave owners with rooms that serve little purpose beyond pushing up maintenance and utility bills.

Yee draws on his own experience to make the point. When he rebuilt his family home, the floor area came in at under half of what the plot would have permitted. The result, he says, was a home sized to the family’s actual needs rather than to the plot’s theoretical capacity.

Yee’s central message is that building super-big is not automatically the smartest move. A right-sized home can deliver lower construction risk, lighter property tax, reduced maintenance and a layout that matches how the family actually lives. As he puts it: “Nonetheless, small can be beautiful.”

For prospective landed buyers weighing a rebuild, the column is a reminder to look beyond the raw GFA entitlement and consider the total cost of ownership over the life of the property.