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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 construction cost is much higher than the 2011 cost, which was $184,125, and NAHB notes it is the highest itâs been since 1998. The 2013 construction cost per square foot ($95) also jumped in comparison to 2011, where it was $80 per square foot. sold for $399,532. 2  average share of the homeâs sales price which goes to construction cost was 62% (up from 59% in 2011). 3  second largest share of the sales price, which was the finished lot costs, was 19% (lower than the 2011 share of 22%).