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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.
Summary: How much does it cost to build a house? Professional builders know the current cost to build a new home is $89 to $160 per sq ft, or more, depending on the homeâs size, design, quality, and location.