In 2013, had my garage built by a local steel building erector. I prepped the ground, they put in the 4 foot footings, poured the 6 inch floor. Put up the whole building with 2 windows, 2- 8 ft. Garage doors, fully insulated with 4 in. foam. . No wood in it. 24 x 30, for 13,000. To make it 5 foot longer would have upped the price almost 5K. The company is still going great, expanding, Hardsteel. $18.05 sq. Ft. and I thought it was kind of high. Of course this is in rural Nebraska, did not need a building permit. And it is too small of course.