Build Costs 2 x Freestanding vs 2xDuplex

Just wondering for the experienced developers here,

been looking at some quotes for building and most builders seem to say 2 free standing costs the same or even less then 2 semis (all things being equal)

just investigating a block where duplex and freestanding is possible. but trying to get my head around if the costs are the same/more for a duplex, why would anyone do so unless it was a space issue.

cheers
 
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