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wrote:

Costs of excavation (especialling tunneling for roads $$$).
Somewhere to put the spoil.

If its done as a one off house, yes it costs, though jcbs make that not
excessive any more. But if it were done en masse, one would only need
to excavate a foot or so, build the layer of housing then put the soil
on top of them. The ground level would become higher. More concrete
would be required to support a foot of earth on the roof, but not as
much more as sinking just one house would need. Also with no exterior
walls on dense housing there would be no need for brickwork, poured and
block walls would be the standard, saving on brickwork.

NT