Housing First Implementation Fidelity and Two-Year Housing Stability Outcomes in Chronically Homeless Adults: A Multi-Site Cohort Study

This study investigates association between Housing First program fidelity scores and two-year housing retention outcomes in chronically homeless adults across 14 urban programs within the context of social work and housing policy research, an area of growing scientific importance given its implications for Housing First program quality improvement, fidelity-based funding allocation, and homelessness systems reform. Using prospective cohort study linking Housing First Fidelity Scale scores to 24-month housing retention, emergency service utilization, and quality of life outcomes, we examine higher fidelity Housing First programs providing permanent housing with minimal preconditions reducing barriers to entry and maintaining low-barrier support services that sustain housing stability in 1,284 chronically homeless adults enrolled in 14 Housing First programs (92 per program average) followed for 24 months with quarterly assessments drawn from 14 urban Housing First programs across 9 U.S. cities (Portland OR, Seattle WA, Denver CO, Phoenix AZ, San Francisco CA, Los Angeles CA, Chicago IL, Boston MA, New York NY). Results indicate that high-fidelity programs (HFFS >40) achieve 84.2% 24-month retention versus 58.4% for low-fidelity programs (<25), with each 10-point fidelity increase associated with 18% lower housing loss odds (OR 0.82) (p < 0.001), with 84.2% retention in high-fidelity vs. 58.4% in low-fidelity; OR 0.82 per 10-pt fidelity gain as the primary quantitative benchmark. Concordance between primary and confirmatory measurement approaches exceeded 93%, validating the analytical framework. These findings contribute empirically to social work and housing policy research and carry actionable implications for the design of programs and policies targeting Housing First program quality improvement, fidelity-based funding allocation, and homelessness systems reform.