Costs for ordinary cellars were reported for most sections as varying
from 50 cents to $1 per square foot of floor space. The cost per square
foot is, of course, less for a large than for a small cellar, other
things being equal. Easy excavation and low-cost materials also make
for low unit cost. Costs of nearly $2 per square foot were reported in
some sections where the ground-water level is high and cellar walls and
floor must be carefully waterproofed. In sections where cellars are not
ordinarily used the cost of the foundation was reported as part of the
cost of the house superstructure.