Costs to build a duplex The cost of a duplex is less than that of a single-family home. The average price tag to build a new duplex is between $285,000 and $537,000 nationally, according to Fixr .

How much does it cost to build a house in the U.S.? The average cost to build a brand-new single-family home in 2025 is $323,026, according to data from HomeAdvisor.That price, however, can range ...

If you’ve searched the market and determined there’s no existing home that meets your needs, you may start to wonder: How much does it cost to build a house? It’s a reasonable question ...