Methods	Design: Cost analysis based on a before‐and‐ after study without control group
Participants	Population: Adults who met the federal definition of individuals who are chronically homeless with significant disabling physical or psychiatric conditions who were referred either from King County Public Health's REACH homeless outreach team (Seattle, WA, USA) or from medical respite with incurred inpatient paid claims of at least US$10,000 in the previous year
Interventions	Intervention:
	Received a Housing First programme (Begin at Home)
	Comparator:
	Individuals who did not receive the Begin at Home intervention
Outcomes	Cost or cost‐effectiveness: The difference in service use associated cost reductions between the Housing First participants and comparison group of $36,579 outweighed the programme operating costs of $18,600 per person per year
Notes