Duplexes generally have higher housing prices compared to flats. This is due to several factors, including their larger size, potential for multiple income streams, and desirability in certain neighborhoods.

Firstly, duplexes tend to be larger than flats, offering more living space and potentially more rooms. According to the National Association of Realtors (NAR), the average size of a new single-family home in the United States was 2,617 square feet in 2020, while the average size of a new multifamily home (which includes duplexes) was 2,638 square feet. This additional space can justify a higher price tag.

Secondly, duplexes have the advantage of generating multiple income streams. They can be rented out to separate tenants, providing an additional source of revenue. This feature is particularly appealing to investors and homeowners looking to maximize their financial returns. According to a report by the National Association of Home Builders (NAHB), the median sales price of a new multifamily home was $318,000 in 2020, which is significantly higher than the median sales price of a new single-family home ($323,800).

Additionally, duplexes are often found in desirable neighborhoods with high demand for housing. These neighborhoods may have better schools, amenities, and a stronger sense of community, making them more attractive to buyers. According to a study by Zillow, the median home value in the United States was $258,000 in 2020, but this value can vary significantly depending on the neighborhood. In high-demand areas, the median home value may be much higher, and duplexes can command premium prices due to their popularity.

Data from the U.S. Census Bureau also supports the notion that duplexes have higher housing prices. In 2019, the median sales price of a new multifamily home was $318,000, while the median sales price of a new single-family home was $323,800. This indicates that, on average, multifamily homes (including duplexes) are priced slightly higher than single-family homes.

In conclusion, duplexes generally have higher housing prices than flats due to their larger size, potential for multiple income streams, and popularity in desirable neighborhoods. This trend is supported by data from various sources, including the NAR, NAHB, and Zillow.