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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.
Sales Price. The average price of the new single-family home in the 2015 construction cost survey is $468,318, and it is the highest average since the survey was started in 1995. The average sales price has been rising over the past few years, from $310,619 in 2011 and $399,532 in 2013.