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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.here are many factors that must be considered in order to calculate cost per square foot on a home construction project. In addition, the per square foot cost is sometimes shown in two different ways, one with the cost of the building lot included and one without.