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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.
Cost of Building a House per Square Foot: Location and Cost per Square Foot. In the South Eastern United States the average home costs about $80 per square foot, while in California the average cost is $130 per square foot. This does not include the lot, which is also much more expensive in California. Prices in the North East are between $100 and $130 per square foot. The prices seem to rise as you travel up the eastern seaboard, with the exception of Florida which is a little higher than the rest of the South.