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Lawmakers debate bill to require cities to permit triplexes and fourplexes
Summary
Sen. Jeremy Trebas' SB 266 would require many Montana cities to allow triplex and fourplex housing where single-family homes are permitted; supporters said it expands options and supply, while municipal planners warned of financing, infrastructure, and local-planning conflicts.
Senate Bill 266 — sponsored by Sen. Jeremy Trebas — returned to the House Local Government Committee as a proposed expansion of last session's duplex law. Trebas said the bill would require some municipalities (generally those with populations above 5,000) to permit triplexes and fourplexes on lots where single-family dwellings are allowed and would prevent zoning rules for those units from being more restrictive than for single-family homes. A delayed effective date of Oct. 1, 2026, was included to let cities align the…
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