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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.
Average construction costs would be $300 per square-foot, making a 3000 square-foot home cost about $900,000 and a 5000 square-foot home cost $1,500,000. The architect fees could be up to $300,000.