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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.
The Nov 2011direct cost of building a new home anywhere in the United States is $80.00 to $110 per square foot. This does not include land, land development, or the General Contractor's profit and overhead.avier Chaco, , Boca Raton, FL. It depends on what kind of construction you are doing, based on the National Builders Reference, to build an addition in or around Seattle, should run anywhere from $ 200 to $ 500.00 per square foot, the 500 for high end finishes.