When was semidetached houses built?

Semidetached houses began to be built in the late 19th century, particularly in the UK, as a response to urbanization and the demand for affordable housing. This architectural style gained popularity in the early 20th century, especially in suburban areas, as it allowed for more efficient land use while providing a sense of individuality for homeowners. The design typically features two homes that share a common wall, combining the benefits of single-family living with reduced construction costs.