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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.
Quick Answer. As of 2014, the average construction cost to build a new home in Washington runs between $80 and $200 per square foot. To determine the actual construction cost for a new home in Washington, there are many variables, including the type, style and quality of supplies and location. Continue Reading.