AbstractMental health programs are increasingly combining evidence‐based practices to provide comprehensive services. Individuals with complex services needs, such as those dually diagnosed with mental illness and substance use disorders, are at high risk for numerous negative outcomes and may benefit from such comprehensive programs. This report describes the process and outcomes of a program that formally integrated assertive community treatment, supported housing, and integrated dual disorders treatment for a sample of clients with dual diagnoses. Over a 2‐year period, this pilot program targeted 14 clients with 12 clients successfully transitioned out of a state hospital into the community. Results showed large reductions in hospitalization, homelessness, and incarceration, and increases in employment and later stages of treatment for substance abuse. This study demonstrates the potential of such an integrated program and points to areas for further research in housing services. © 2009 Wiley Periodicals, Inc.