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Average Home Building Costs Per Sq Ft: Shell Option. The average home building cost per sq ft for a home is far more uniform than the finished cost per square foot. A shell does not include the foundation, landscaping, fixtures, cabinetry finishes or appliances. Sometimes it does not even include drywall. It usually doesnât include the plumbing or electrical wiring either, though sometimes rough plumbing and wiring are included. The average home building cost per sq ft for a shell is about $25 per square foot with a range of about $22 to $30 per square foot.
Cost of Building a House per Square Foot: Location and Cost per Square Foot. In the South Eastern United States the average home costs about $80 per square foot, while in California the average cost is $130 per square foot. This does not include the lot, which is also much more expensive in California. Prices in the North East are between $100 and $130 per square foot. The prices seem to rise as you travel up the eastern seaboard, with the exception of Florida which is a little higher than the rest of the South.