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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.
Building permits are needed for more than just to build a new home. The national average cost of a building permit is $1,156, with most homeowners spending between $451 and $1,862. This data is based on actual project costs according to HomeAdvisor members. Depending on the area, they may be required for additions, renovations and even electrical or plumbing projects.