Chronic homelessness is a highly complex social problem of national importance. The problem has elicited a variety of societal and public policy responses over the years, concomitant with fluctuations in the economy and changes in the demographics of and attitudes toward poor and disenfranchised citizens. In recent decades, federal agencies, nonprofit organizations, and the philanthropic community have worked hard to develop and implement programs to solve the challenges of homelessness, and progress has been made. However, much more remains to be done. Importantly, the results of various efforts, and especially the efforts to reduce homelessness among veterans in recent years, have shown that the problem of homelessness can be successfully addressed. Although a number of programs have been developed to meet the needs of persons experiencing homelessness, this report focuses on one particular type of intervention: permanent supportive housing (PSH). Permanent Supportive Housing focuses on the impact of PSH on health care outcomes and its cost-effectiveness. The report also addresses policy and program barriers that affect the ability to bring the PSH and other housing models to scale to address housing and health care needs.

Accessible and affordable housing can enable community living, maximize independence, and promote health for vulnerable populations. However, the United States faces a shortage of affordable and accessible housing for low-income older adults and individuals living with disabilities. This shortage is expected to grow over the coming years given the population shifts leading to greater numbers of older adults and of individuals living with disabilities. Housing is a social determinant of health and has direct effects on health outcomes, but this relationship has not been thoroughly investigated. In December 2016, the National Academies of Sciences, Engineering, and Medicine convened a public workshop to better understand the importance of affordable and accessible housing for older adults and people with disabilities, the barriers to providing this housing, the design principles for making housing accessible for these individuals, and the features of programs and policies that successfully provide affordable and accessible housing that supports community living for older adults and people with disabilities. This publication summarizes the presentations and discussions from the workshop.