The START Housing Act of 2023 reauthorizes and expands a federal pilot program that helps people recovering from substance use disorders obtain stable housing. The bill extends the program from its current expiration date through 2029 and removes the previous two-year housing limit, allowing participants to stay housed longer. Funding prioritization will focus on states with the greatest need, measured by unemployment rates, low labor force participation, drug overdose deaths, and unsheltered homelessness. The legislation requires states to use funds to supplement existing housing and recovery services rather than replace them, and mandates coordination with local housing agencies to ensure participants can transition to other housing after leaving the program. States may also receive technical assistance and training on best practices from the federal government to implement the program effectively.