Jelorian,
I would say that when building a house the major cost is ussually the land, so a basement is not a major investment.
However, in CA a builder has to meet WAY stricter guidlines if there is a basement. (As far as load bearing, and resiliency...etc)
These requirements DO make it too expensive. So most people who want the extra storage space just put in a bigger garage, or attic, or something.
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