Housing Policy and Public Health: What Stable Housing Does for Wellbeing

Housing is widely recognized as a social determinant of health, a condition of daily life that shapes health outcomes independent of the quality of healthcare received. Research has documented robust associations between housing instability and a broad range of adverse health outcomes, from chronic disease to mental illness to shortened life expectancy. Yet housing policy in the United States has not consistently reflected this understanding, and the consequences are visible in the health outcomes of communities that lack affordable, stable housing. The most extreme form of housing instability is homelessness, which is associated with dramatically elevated rates of mortality, infectious disease, chronic illness, mental health conditions, and substance use disorders. People experiencing homelessness have life expectancy estimates 20 to 30 years lower than housed populations. They present to emergency rooms and hospitals at high rates, often for conditions that would be preventable or manageable with stable housing and primary care. The cost to health systems of unhoused individuals is substantial and consistently exceeds the cost of housing subsidies that could address their situation. Housing First, an approach that provides stable housing to chronically homeless individuals without preconditions related to sobriety or treatment participation, has accumulated a strong evidence base. Multiple randomized trials have shown that Housing First produces superior housing retention, improved quality of life, and reduced emergency service utilization compared to treatment-first approaches. The evidence challenges the intuition that housing must be earned through sobriety or treatment compliance. It suggests instead that housing is the precondition for addressing the other challenges that people experiencing chronic homelessness face. Below the threshold of homelessness, housing instability in its many forms, eviction, frequent moves, overcrowding, couch-surfing, and spending unaffordable shares of income on rent, produces significant health consequences. Eviction research, particularly the work of sociologist Matthew Desmond, has documented that eviction is not simply a consequence of poverty but a cause of deeper poverty and its associated health harms. Eviction disrupts children's schooling, destroys social networks, damages employment, and is associated with elevated rates of depression, anxiety, and adverse childhood experiences. Housing quality affects health through direct mechanisms. Lead paint in older housing is a well-documented source of childhood lead exposure, which causes irreversible neurological damage and is strongly associated with lower cognitive achievement and higher rates of behavioral problems. Mold, poor ventilation, and inadequate heating and cooling contribute to respiratory illness, asthma exacerbation, and heat-related illness. Structural hazards cause injuries. Crowding facilitates infectious disease transmission. These are direct, physical pathways from housing conditions to health outcomes. The affordability crisis in housing has intensified in the past decade. A household is conventionally considered housing-cost-burdened when it spends more than 30 percent of income on housing, and severely cost-burdened when spending more than 50 percent. The share of American households that are cost-burdened or severely cost-burdened has grown substantially, driven by rising rents, stagnant wages, and insufficient housing supply. Cost-burdened households face tradeoffs between housing and other necessities, including food, healthcare, and transportation, with predictable health consequences. The policy landscape for housing and health includes several overlapping domains. Zoning and land use policy shapes housing supply: exclusionary zoning that restricts density in high-opportunity areas limits the supply of affordable units and concentrates low-income families in lower-opportunity neighborhoods with worse schools, more environmental hazards, and fewer health resources. Federal housing assistance, including Section 8 vouchers, public housing, and the Low Income Housing Tax Credit, provides housing support to a portion of eligible households, but funding falls far short of need. Most eligible households are on waiting lists rather than receiving assistance. Tenant protection policies, including just-cause eviction requirements, right-to-counsel in eviction proceedings, and eviction diversion programs, have grown in interest as eviction research has documented its health consequences. Evidence on the health effects of specific tenant protections is growing: studies have linked stronger eviction protections to lower rates of homelessness, emergency room utilization, and certain health conditions in comparison jurisdictions. The intersection of housing policy and mental health deserves particular attention. Stable housing is a prerequisite for mental health treatment engagement and recovery. People who are housing-insecure cannot reliably attend appointments, manage medications, or maintain the basic conditions of self-care that mental health recovery requires. Conversely, serious mental illness is a risk factor for housing instability and homelessness. Integrated housing-mental health policy that addresses both is more effective than siloed approaches. The evidence that housing stability improves health is as strong as the evidence for many widely adopted medical interventions. The policy challenge is allocating resources to housing at a level commensurate with its health impact, in systems designed to fund healthcare rather than the social conditions that determine whether healthcare is needed.