well, i'd forget about a basement. i've got a basement bid sitting on
my desk for a 2100 square foot house-- excavating is 30 grand, concrete
work is 40 grand. granted, it's a complicated footprint.
but a 50 by 100 foot basement is no small matter. that is 2000 yards
of fill that would have to be hauled out of there. something like 150
loads in a tandem dumptruck. if you could get one in there every half
hour, that would be 75 hours of steady hauling fill out of there. if
you just say he has two trucks at 100 bucks an hour per, and an
excavator at 150 an hour, that's 34 grand just for that part of it.
then there is road building, getting 6" of granular fill back into the
monster, utilities, back filling, drain tile, etc. as far as the
concrete work goes, the materials alone for such a thing would have to
run 30 grand, if you use icf's. labor would be very high because
something so big would have to be done in stages.
so you'll want to call a mason anyway. ask him what a 50x100 foot slab
is going to cost, and if that doesn't knock your socks off, go from