how much cost to build house
1 It's possible to custom-build an 800-square-foot dome house for $1 million or a 12,000-square-foot rural ranch house for $400,000. 2  However, the $400,000 custom-built house is the exception rather than the rule. However, building a modest custom home in a low-cost area might drop costs as low as $100 a square foot, or $350,000 for 3,500 square feet.