Home and Roof Framing Cost Average total cost: $46,400. Cost range: $14.75 to $27.00/sq. ft. Average cost: $18.80/sq. ft. Share of total home cost: 18.0%. Everyone's dream home is unique—and so are the costs! With that said, the average sales price of an existing single-family house in 2017 was about $291,000. If we compare that price to the cost to build a house ($428,000), it costs around $137,000 more to build a new house rather than to buy an existing one. Yikes!Build Your Own House - Cost Estimating Summary: How much does it cost to build a house? Professional builders know the current cost to build a new home is $89 to $160 per sq ft, or more, depending on the home's size, design, quality, and location.Open since 1983, Worldwide Steel Buildings has been helping homeowners plan, design, and build custom homes made out of steel and metal. With sizes ranging from 576 square feet to more than 6,000 square feet, Worldwide Steel Buildings can help you create just about any home that you can dream up.