froze, it depends where you are and if it's necessary. Since labor is about 25-50% of construction costs, builders will try to cut down out that.
Out here in the California, most houses don't have basements because the climate doesn't require it. And most newer houses here are just built on slab. It's totally different from the Midwest where you have to worry about the frost line.
But I agree--digging into the earth is nice to maintain a more consistent temperature.
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