There are just too many variables to answer such a question yet CheatSheet tries with seven pages, each with more advertising to be viewed.
According to Realtor.com, around 1 million homeowners were expected to build their own houses in 2016. The average size of a new home built in 2015 was 2,467 square feet, U.S. Census numbers report, though the cost per square foot varied depending on the source. Realtor.com found the average to be around $103 per square foot, while a separate study from HomeAdvisor reported the average cost at $150 per square foot. Overall, that range equals an average new home cost between $290,000 and $305,000.
I suspect that because those numbers are an average that the price and size will vary substantially from one part of the country to another. Seven pages of advertising and you still won’t know what it costs to build a house where you live.