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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.
How much does it cost to build an addition? Cost to build a home addition vary from $130 per square foot on the cheapest end to $650 / sq. ft. or even more for custom top notch work.