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In the majority of states the average cost is below $85 per square foot. In the northeastern states and California the average price of construction can be between $100 and $120 dollars per square foot.In reality there are many factors that impact the average custom home costs.Letâs walk through a few.n the northeastern states and California the average price of construction can be between $100 and $120 dollars per square foot. In reality there are many factors that impact the average custom home costs.
Average New Home Construction Cost Per Square Foot. Average new home construction cost per square foot varies by state, and ranges from $75 to $130 per square foot. Homes in the Southeastern and Midwestern states cost much less than homes in California, Hawaii and the Northeastern states.