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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 answer depends on the region you will build in and the quality and type of materials used. On average, the cost per square foot to build an average home is $125 per â¦ square foot.  There are some builders, who build what is called formula homes. Based on current material costs and actual inspections, building costs range from $200 sq. ft to as high as $300 based on the quality and finish of the home. Coastal hom â¦ es typically are higher due to increased engineering costs (coastal area).