Housing units refer to units of residential construction, including houses, condominiums, townhouses, apartments and mobile homes. They are usually identified as self-contained living spaces such as a single-family detached dwelling, duplex, apartment or other living unit that may be occupied by one family, two or more families, or otherwise unrelated occupants. Housing units are a key component of urban planning, as the layout of a city and its population is largely determined by its housing policy.

Every housing unit must meet certain safety and health code requirements, and in some jurisdictions, these regulations may apply to both existing and new construction. Building codes also often specify certain energy efficiency, water conservation, and fire safety standards. In some countries, local government groups also develop and issue these standards.

Housing units can also be an important source of employment. Developers and workers associated with the construction of the units can provide construction jobs, while subsequent sales can create more economic activity. During times of economic recessions, housing units can drop significantly in value, leading to decreased investment in the sector.

Moreover, housing units can be a source of social stability. Simple, affordable housing can help provide a measure of security for families. Secure and affordable housing can also enhance other well-being variables such as educational achievement, physical health, and even employment potential for those living in the units. In addition, well-designed housing units can help provide an attractive and healthy environment, which can boost the communities in which they are located.

Overall, housing units make up an important part of urban life. By providing a secure and comfortable place to live and the potential for economic and social stability, housing units are an integral part of a functioning society.