90 per square foot is an accurate estimate for a house that is not totally custom. In omaha, NE where the house is going to be built, a 2 story, 3000 sq ft house with a full basement, square footage not counting the basement, is between 250k and 300k. I just called around to some contractors and their best guess without seeing the house plans, calculated by linear feet of wall and square footage of garage slab and basement slab is around 35-40k for a walkout.