Programs that provide affordable, community-based housing for individuals and families who have experienced long-term or chronic homelessness and have been diagnosed as having a physical or developmental disability, a severe mental illness, substance use disorder problems or HIV/AIDS; or are members of another designated group within the homeless population. Structures may include apartments, single-family houses, duplexes, group homes or single-room occupancy housing. Permanent supportive housing programs generally provide residents with the rights of tenancy under state or local landlord/tenant laws and are linked to services designed to meet residents' needs. Supportive services vary depending on the resident population. Most programs offer some type of case management and housing support, but may also offer more intensive mental health, substance use disorder, vocational, employment or other services which help promote independent living. Supportive services may be offered on-site or off-site, or be provided by a mobile service team and may be available to people with current housing who are at risk of becoming homeless.

Families, usually consisting of two parents and their children but also including single parent families, extended families and nontraditional family groups, who have no fixed, regular and adequate residence, who are residing temporarily with relatives or friends or who live on the street, in emergency or transitional shelters, in a hotel or motel paid for with a shelter voucher, in seriously substandard housing or in an abandoned building, place of business, car or other vehicle, or other public or private place that is not ordinarily used as a regular sleeping accommodation for people.