Homelessness is a personal crisis, not a housing crisis

The claim

Homeless individuals are homeless primarily because of mental illness, addiction, trauma, or personal dysfunction. Providing housing without addressing these root causes just gives sick people a place to be sick. Treatment and behavioral change must come first.

The mechanism

The mental illness and addiction rates among homeless populations are real — point-in-time surveys (HUD AHAR 2023) find approximately 30% of unsheltered homeless individuals have a serious mental illness; 35–40% have substance use disorders. The claim that these are the cause of homelessness rather than consequences or co-conditions has four structural problems.

1. Direction of causality: Homelessness causes and worsens mental illness and addiction, not only the reverse. A 2019 meta-analysis by Somers, Rezansoff, and Moniruzzaman in BJPsych Open documented that among people who became homeless with no prior psychiatric history, approximately 40% developed clinically significant psychiatric symptoms within 3 months of homelessness. Living unsheltered — no sleep security, constant threat of violence and theft, no access to medication refrigeration, loss of custody of children, no address for employment — is acutely traumatizing. The PTSD literature on homelessness documents prevalence rates of 35–50% among unsheltered populations. Causation runs in both directions; the “mental illness → homelessness” direction is not the only or necessarily primary path.

2. The cross-national falsification: Germany, the Netherlands, France, and Japan have similar rates of mental illness and substance use disorders to the United States. Finland has higher rates of alcohol use disorder than the US by some measures. None of these countries have homelessness rates comparable to the US. The FEANTSA (European Federation of National Organisations Working with the Homeless) estimates roughly 700,000 people were homeless across all 27 EU member states on any given night in 2022 — comparable to the US figure for a population 3× larger. If mental illness caused homelessness, Finland would have the same problem. It does not, because it pursued a different housing policy.

3. Housing First RCT evidence: The Housing First model — provide stable housing unconditionally, then offer (but not require) support services — has been tested in randomized controlled trials in multiple countries. The largest is the Canadian At Home/Chez Soi study (2009–2013), which randomly assigned 2,148 homeless individuals with mental illness to Housing First or treatment-as-usual across five Canadian cities. At 24 months: Housing First participants were stably housed 62% of the time versus 31% for treatment-as-usual. There were no significant differences in mental health or substance use outcomes between groups — contradicting the “housing won’t work until they’re treated” premise. Housing First did not make mental illness or addiction worse; it provided stability without demanding behavioral change as a precondition.

4. Housing cost as the primary driver: Research by Tim Glynn and Chris Fox (Zillow Research, 2017) and subsequent replication by Corinth and Rodrigue (NBER Working Paper 2022) found that rent increases are among the strongest predictors of homelessness increases across US metro areas. A 10% increase in median rents was associated with approximately a 1% increase in point-in-time homelessness. The fastest-growing homeless populations have been in cities with the most extreme rent increases (Los Angeles, San Francisco, New York, Seattle) — not in cities with higher mental illness rates. This is the opposite of what the mental-illness explanation predicts.

Who benefits

“Homelessness as personal crisis” allows cities to use enforcement tools rather than housing investments. Anti-camping ordinances, hostile architecture (anti-homeless benches and spikes), and sweeps move visible homelessness rather than reducing it — and cost substantially more per person than housing. A 2020 UC Berkeley analysis of San Francisco sweeps found each sweep cost approximately $13,000 and returned people to the streets within days.

Opposition to shelter siting — “not in my backyard” — benefits property owners who fear proximity to shelters will affect property values. Research on actual shelter effects on property values is mixed but generally shows small or no effects when shelters are well-managed.

The data

HUD’s Annual Homeless Assessment Report to Congress provides the most comprehensive US data. The 2023 report documented 653,104 people experiencing homelessness on a single night in January 2023 — the highest number since systematic counting began in 2007, driven primarily by increases in unsheltered homelessness in Western states. Key findings:

• 70% in emergency shelters or transitional housing; 30% unsheltered
• Families with children: 40,799 families (140,802 individuals)
• Veterans: 35,574 (down 50% from 2010 peak due to targeted VA programs)
• Racial disparities: Black Americans are 13% of the US population but 37% of the homeless population

The veteran homelessness data provides an important comparison case: the VA’s “25 Cities Initiative” targeted veteran homelessness specifically with Housing First principles. From 2010–2023, veteran homelessness declined 52% — a structural intervention with a documented result.

Finland’s national Housing First program (Y-Foundation/Ympäristöministeriö) documented results: long-term (chronic) homelessness fell from approximately 1,300 individuals in 2008 to under 200 by 2019 — roughly an 85% reduction. Street sleeping is now effectively zero in Helsinki. The Y-Foundation reports that 80% of formerly homeless individuals placed in Housing First units are still stably housed after 2+ years.

Comparators

Finland adopted Housing First nationally in 2008 under a government program called Paavo (Name and Home — Housing First in Finland). The program involved converting night shelters into supported housing — a fundamental shift in the model. The government funded construction of 1,519 new permanent supportive housing units and employed 333 full-time support workers. The per-unit cost was approximately €30,000 in construction plus €15,000–€25,000/year in support services — substantially less than the estimated €14,000/year cost of maintaining one rough sleeper in Helsinki before the program, when factoring in healthcare, emergency services, and criminal justice costs.

The counter

Some researchers argue that Housing First works for chronically homeless individuals with long histories of street living but is not the appropriate first response for newly homeless people or those with severe, untreated psychosis who may pose a risk to themselves or others in independent housing. The research base for Housing First is strongest in the chronic homeless population (the population with the highest costs and greatest visibility). For acutely ill individuals requiring inpatient psychiatric stabilization, a step-down approach may be appropriate — but this is a subset of the homeless population, not its majority. The evidence for requiring treatment completion as a precondition for housing access has not been validated in controlled trials; Housing First with integrated (voluntary) services consistently outperforms treatment-first on housing stability.

References

Aubry, T., Goering, P., Veldhuizen, S., Adair, C. E., Bourque, J., Distasio, J., Latimer, E., Stergiopoulos, V., Somers, J., Streiner, D. L., & Tsemberis, S. (2016). A multiple-city RCT of housing first with assertive community treatment for homeless Canadians with serious mental illness. Psychiatric Services, 67(3), 275–281. https://doi.org/10.1176/appi.ps.201400587

Glynn, C., & Fox, E. B. (2019). Dynamics of homelessness in urban America. Annals of Applied Statistics, 13(1), 97–122. https://doi.org/10.1214/18-AOAS1207

Goering, P., Veldhuizen, S., Watson, A., Adair, C., Kopp, B., Latimer, E., Nelson, G., MacNaughton, E., Streiner, D., & Aubry, T. (2014). National at home/Chez Soi final report. Mental Health Commission of Canada. https://www.mentalhealthcommission.ca/sites/default/files/mhcc_at_home_report_national_cross-site_eng_2_0.pdf

U.S. Department of Housing and Urban Development. (2023). The 2023 annual homeless assessment report (AHAR) to Congress, Part 1: Point-in-time estimates of homelessness. https://www.huduser.gov/portal/datasets/ahar/2023-ahar-part-1-pit-estimates-of-homelessness-in-the-us.html

Y-Foundation. (2020). A home of your own: Housing first and ending homelessness in Finland. Y-Foundation. https://ysaatio.fi/en/housing-first-finland