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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.
What is the average construction cost per square foot for building a house in Chicago southwest suburbs? The average construction cost per square foot for building a house  in Chicago southwest suburbs is 2,520 square feet, which assumes a  two-story structure. This places the â¦construction at $117 per  square foot.