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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 actual per square foot cost formula simply involves dividing the total cost of the home construction project by the total square feet of the project. For example, if a 400 square foot home addition costs $50,000 to build, the per square foot cost for the home addition would be $125.f on the other hand the same square foot home addition costs $75,000 to construct, because for example the inclusion of high end materials or a bathroom, the cost per square foot would be $187.50. In addition, the amount of square feet to use in the per square foot cost calculation can also be a variable.