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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.
The average cost per square foot to build a home in Indiana is  about $132 per square foot. This means a 2500 square foot home  would cost around $330,000 to build. The answer depends on the region you will build in and the quality and type of materials used. On average, the cost per square foot to build an average home is $125 per â¦ square foot.