ORDINANCE GUIDEEffective Feb 2026
Boise Infill Development Guide
Zoning, setbacks, and permitting for infill development in Boise. Covers ZOA25-000013 ADU rules and Idaho SB 1352 starter-home allowances effective July 1, 2026.
This guide summarizes Boise infill-development rules based on the City of Boise Zoning Code and Idaho Senate Bill 1352. Effective date: 2026-02-15 (ZOA25-000013) and 2026-07-01 (SB 1352). This is not legal advice. Standards change. Verify all information at https://codelibrary.amlegal.com/codes/boise_id/latest/boise/0-0-0-65305 and https://legislature.idaho.gov/sessioninfo/2026/legislation/s1352/ before making any development or acquisition decision.
Renew analysis
Where this pathway usually breaks. And where it actually works.
Enables high-density small-lot subdivisions on larger parcels, unlocking land value through unit count rather than lot size. Operators can pursue 12+ units/acre without traditional setback constraints on qualifying tracts.
Guarantees ADU-by-right on every residential lot statewide, removing local discretion to block ADUs. Infill builders can plan for ADU income or resale premium without zoning risk.
Two-ADU allowance doubles rental income potential on infill lots. Alley setback relief and transit parking exemption reduce site constraints, making narrow or transit-adjacent lots viable for ADU builds.