Summary of Star Ordinance 428-2025 (Dec 2025) · ADU 800 sqft / 50% primary cap; owner-occupancy removed; 5 ft rear/side setbacks as it applies in Star. Reference: https://library.municode.com/id/star.
Code evolves continuously. Verify at the official source (https://library.municode.com/id/star) before any development decision.
Applicable code
Code references active as of publication. Verify current standards at the official source before any development decision.
ADUs shall not exceed 800 square feet or 50% of the primary dwelling's gross floor area, whichever is less.
Investor implication: Size cap limits ADU rental income potential but enables faster permitting on smaller lots where 50% rule would otherwise restrict development.
Verify at City of Star Municipal Code →Owner-occupancy requirements for properties with ADUs have been removed.
Investor implication: Investors can now acquire properties with existing ADUs or build new ADUs without living on-site, expanding rental inventory opportunities.
Verify at City of Star Municipal Code →ADUs shall maintain a minimum 5-foot setback from rear and side property lines.
Investor implication: Reduced setbacks from prior standards enable ADU placement on smaller lots and maximize buildable area on standard residential parcels.
Verify at City of Star Municipal Code →Parking requirements for ADUs were not specified in Ordinance 428-2025. Contact Star Planning & Zoning to confirm current parking standards before site design.
Investor implication: Parking requirements directly impact site feasibility on constrained lots—verify before acquisition.
Verify at City of Star Municipal Code →One ADU is permitted per single-family residential lot.
Investor implication: Single-ADU limit caps rental income potential per parcel compared to Boise's two-ADU allowance but simplifies permitting and neighborhood compatibility.
Verify at City of Star Municipal Code →Renew analysis