Housing First Around the World: International Evidence and Adoption

Housing First is the principle that permanent housing should be provided to people experiencing homelessness as quickly as possible, without requiring sobriety, treatment compliance, or "housing readiness" as preconditions^[1]. Once housed, individuals receive voluntary wraparound services — mental health treatment, substance use support, employment assistance, case management — tailored to their needs and preferences. The approach reverses the traditional "treatment first" or "staircase" model, which requires people to progress through shelters and transitional programs before earning access to permanent housing.

The evidence supporting Housing First began accumulating with Sam Tsemberis's Pathways to Housing program in New York City, which demonstrated 85–90 percent housing retention rates for chronically homeless individuals with severe mental illness and substance use disorders in the 1990s and early 2000s^[1]. Since then, the evidence base has expanded through randomized controlled trials and national-scale implementations across multiple countries, health care systems, and cultural contexts. The consistency of the findings is exceptional in social policy: Housing First produces superior housing retention, comparable or better health outcomes, and often lower total system costs than the models it replaced^[2].

This article traces Housing First's international spread: from its origins in the US, through major national implementations and research trials in Canada, Finland, France, Denmark, and elsewhere, to its current status as the default recommended approach in European and North American homelessness policy. For the US evidence base and principles, see Housing First principles and evidence.

Origins: Pathways to Housing

Housing First was developed by Sam Tsemberis, a clinical psychologist who founded Pathways to Housing in New York City in 1992^[1]. The program offered immediate access to independent, scattered-site apartments to chronically homeless individuals with severe mental illness — the population that traditional shelters and transitional programs served least effectively. Housing was not contingent on participation in treatment. Services were available but voluntary. Tenants held standard leases and paid 30 percent of their income toward rent, with the program covering the remainder.

The early results defied the conventional wisdom of the treatment-first field. Pathways participants achieved 85–90 percent housing retention at twelve months, compared to 40–60 percent in traditional programs^[1]. Substance use outcomes were comparable between Housing First and treatment-first programs, but Housing First participants spent significantly more time in stable housing. The program also demonstrated cost offsets: by reducing emergency department visits, hospitalizations, and jail stays, Housing First offset a substantial portion of its housing cost^[1].

Two randomized controlled trials published in the early 2000s established Housing First as an evidence-based practice. Tsemberis, Gulcur, and Nakae (2004) found that Housing First participants achieved an 80 percent housing retention rate over 24 months compared to 30 percent for the treatment-as-usual control group^[1]. Padgett, Gulcur, and Tsemberis (2006) found that Housing First reduced substance use problems as effectively as treatment-first programs while providing dramatically better housing outcomes^[3].

Canada: At Home / Chez Soi

The largest and most rigorous test of Housing First outside the United States was the At Home / Chez Soi study, conducted across five Canadian cities (Vancouver, Winnipeg, Toronto, Montréal, and Moncton) between 2009 and 2013^[4]. The $110 million study, funded by the Mental Health Commission of Canada, was a multi-site randomized controlled trial that enrolled 2,148 participants experiencing homelessness and mental illness, randomly assigning them to Housing First (with intensive case management or assertive community treatment) or treatment as usual^[4].

The results were unambiguous. Over 24 months, Housing First participants spent 73 percent of their time in stable housing compared to 32 percent for the treatment-as-usual group^[4]. Among the "high needs" group (those with the most severe mental illness and functional impairment), Housing First participants spent 68 percent of their time stably housed compared to 29 percent in the control group^[4]. Quality of life, community functioning, and mental health outcomes all improved more in the Housing First group. The study also found that for every $10 spent on Housing First for high-needs participants, $9.60 was offset by reduced use of other services — shelters, hospitals, emergency departments, and jails^[5].

At Home / Chez Soi was transformative for Canadian policy. Following the study's results, the federal government reoriented its homelessness strategy around Housing First, requiring communities receiving federal funding through the Homelessness Partnering Strategy (now Reaching Home) to invest a majority of funds in Housing First approaches^[6].

Finland: National Strategy

Finland's adoption of Housing First as a national strategy represents the most comprehensive government-led implementation of the approach anywhere in the world. Between 2008 and 2023, Finland reduced its homeless population from approximately 7,960 to approximately 3,429 — a 57 percent reduction achieved while most European countries experienced stable or rising homelessness^[7].

The Finnish approach differed from the US and Canadian models in important ways. Rather than providing scattered-site apartments with mobile support teams (the Pathways model), Finland primarily used congregate supported housing: converting existing shelters and hostels into permanent housing units with on-site support services^[7]. The Y-Foundation, a nonprofit housing organization, led the development of new Housing First apartments, building or renovating approximately 3,500 units between 2008 and 2019^[8].

Finland's success rested on several factors beyond the Housing First model itself. First, the strategy was national: the central government financed the housing supply and coordinated with municipalities, eliminating the fragmented local competition for resources that characterizes the US system. Second, Finland had a strong social housing sector (approximately 13 percent of all housing) and a comprehensive welfare state that provided the income support, health care, and social services Housing First residents needed^[7]. Third, the strategy had sustained political commitment across government transitions.

The Finnish experience demonstrates that Housing First can work as a national policy — not just a program. But it also highlights the importance of context: Finland's success was enabled by a social housing supply, universal health care, and social protection infrastructure that the United States lacks. Transplanting Finland's results to the US without transplanting its housing and welfare systems would be unrealistic^[9].

European Trials and Adoption

Housing First has been tested and adopted across Europe through a combination of national policy decisions and the Housing First Europe Hub, a network that promotes evidence-based implementation across the continent^[10].

France. The Un Chez Soi d'Abord ("A Home First") program launched as a randomized controlled trial in 2011 across four French cities (Lille, Marseille, Toulouse, and Paris), enrolling 703 participants with severe mental illness^[11]. At 24 months, Housing First participants spent 70 percent of their time in stable housing compared to 24 percent in the treatment-as-usual group. Following the trial, the French government expanded the program nationally, establishing it as permanent policy in 2018 with the goal of 10,000 Housing First places by 2027^[11].

Denmark. Denmark adopted Housing First as a national strategy in 2014, following pilot programs in Copenhagen and several other municipalities^[10]. Danish evaluations found housing retention rates of approximately 85 percent at 12 months, consistent with the international evidence. Denmark's approach, like Finland's, benefited from a strong social housing sector and comprehensive social protection system.

Portugal. The Casas Primeiro program, based in Lisbon, demonstrated that Housing First could work in a Southern European context with different housing markets, welfare systems, and cultural expectations^[10]. The program achieved housing retention rates of approximately 83 percent at two years for chronically homeless individuals with mental illness.

Ireland, Belgium, and the Netherlands. Multiple Housing First programs operate across these countries, generally demonstrating housing retention rates of 80–90 percent and producing evidence consistent with the US, Canadian, and Nordic results^[10].

Australia: The Journey to Social Inclusion

Australia has tested Housing First through several significant studies. Sacred Heart Mission's Journey to Social Inclusion (J2SI) trial in Melbourne was a three-phase longitudinal study that found Housing First participants achieved significantly better housing stability and reduced use of crisis services compared to standard care^[12]. The Michael's Place study in Sydney and the Common Ground model in multiple cities have added to the Australian evidence base. The 2021 Census counted approximately 122,000 people experiencing homelessness in Australia (using the broader ABS definition), and Housing First adoption has accelerated through state-level homelessness strategies in New South Wales, Victoria, and Queensland^[12].

What the International Evidence Proves

Across countries, contexts, health care systems, and cultural settings, the international evidence converges on consistent findings.

Housing retention. Housing First programs consistently achieve 80–90 percent housing retention at 12–24 months, compared to 30–60 percent in treatment-first programs^[1][4][11]. This finding holds across the US, Canada, Finland, France, Denmark, Portugal, and Australia.

Health outcomes. Housing First produces comparable or better mental health, substance use, and quality of life outcomes than treatment-first approaches^[2]. Housing stability itself is therapeutic: people in stable housing are better able to engage with treatment, maintain medication regimens, and establish the routines that support recovery.

Cost offsets. In every jurisdiction where cost data has been analyzed, Housing First produces significant offsets through reduced use of emergency departments, hospitals, jails, shelters, and crisis services^[5]. Canada's At Home / Chez Soi found nearly complete cost offsets for high-needs participants. US studies have found that permanent supportive housing for chronically homeless individuals saves public systems $30,000 to $50,000 per person per year^[13].

Scalability. Finland's national implementation proves that Housing First can work at country scale, not just as individual programs. Canada's federal reorientation proves it can reshape a national funding system. The US veteran campaign proves it can work within the American context when sufficient resources and integration are provided.

Systemic Connections & Related Articles

The international Housing First evidence presented here extends the US-specific evidence documented in Housing First principles and evidence. Finland's national Housing First strategy is the most successful example of the national-scale approaches compared in homelessness across wealthy nations, while the right to housing examines the legal frameworks that support housing-led approaches. Houston's implementation of Housing First — which produced a 63 percent reduction in homelessness — is documented in The Way Home and Houston's policy approach. The cost-effectiveness of housing solutions presents the economic case that Housing First research has consistently demonstrated. For the social protection systems that enable Housing First to succeed in countries like Finland and Denmark, see social protection systems on systemsofpoverty.info.