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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.
This figure can, and does, change with the size of the home, location of the home and whether the housing market is soft or not. Carl Heldmann estimates the cost of building a new home in the United States to range from $80 to $110 per square foot.