Summary of Star Ordinance 428-2025 (ADU 800 sqft / 50% primary cap; owner-occupancy removed).
Code evolves continuously. Verify at the official source before any development decision.
Applicable code
Code references active as of publication. Verify current standards at the official source before any development decision.
One accessory dwelling unit permitted per single-family lot in residential zones.
Investor implication: Single ADU per lot limits density upside compared to Boise's two-ADU allowance; focus on parcels where one high-quality ADU captures full rental premium rather than multi-unit strategies.
Verify at City of Star Municipal Code →ADU maximum size: 800 square feet or 50% of the primary dwelling's gross floor area, whichever is less.
Investor implication: 50% cap on smaller primary dwellings (under 1,600 sq ft) constrains ADU size below the 800 sq ft ceiling; verify primary dwelling square footage before acquisition to model ADU rental potential accurately.
Verify at City of Star Municipal Code →Owner-occupancy requirement removed. Neither the primary dwelling nor the ADU must be owner-occupied.
Investor implication: Removal of owner-occupancy opens ADU strategy to non-resident investors; primary + ADU can both be rented, improving cash flow on single-family rental acquisitions.
Verify at City of Star Municipal Code →Detached ADUs: 5-foot minimum rear and side setbacks. Attached ADUs follow primary dwelling setback requirements.
Investor implication: 5-foot rear/side setbacks for detached ADUs are more permissive than standard accessory structure rules; verify lot dimensions to confirm buildable envelope before acquisition.
Verify at City of Star Municipal Code →Renew analysis