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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.
Californiaâs average cost per square foot is about $130 per square foot, while in most South Eastern states the average cost per square foot of as low as $75 per square foot. Hawaii and New York home prices are similar to Californiaâs and many of the Northern home prices are also close to those prices.here are many reasons for the vast difference in the average home building cost per sq ft. One is the overall inflation rate and pay scale in each state. States in the South and Midwest have many qualified carpenters, and the overall pay scale and cost of living are comparatively low.