This document discusses harm reduction approaches in housing programs for individuals experiencing homelessness and substance use disorders. It outlines key principles of harm reduction, including meeting clients where they are at without requiring abstinence, focusing on small positive steps, and avoiding punitive responses to relapses. The stages of change model is reviewed as it applies to engaging clients who are not yet ready to change substance use. Specific harm reduction strategies for housing programs include allowing substance use while providing other services and supports to reduce risks, accepting relapses as part of recovery, and having open conversations about mental health and substance use issues. The goal is to provide compassionate services to as many individuals as possible to improve health and housing stability.