Idaho SB 1354 — ADU By-Right (Cities ≥10,000) (ID)
Tracked preemption from the Idaho overlay bundle.
Overview
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Effective
2026-07-01
Sunset
—
Authority
state
Scope
state:ID
Other Idaho preemptions
Idaho SB 1352 — Starter-Home Subdivisions (Cities ≥10,000)Idaho HB 707 — Administrative Lot Splits (Cities ≥10,000)Idaho HB 706 — Single-Stair Building Option (City Opt-In)Idaho HB 585 — Permit Inspection Shot-Clock (Statewide)Idaho Dillon's Rule — Inclusionary Zoning Mandates Ultra Vires (Mountain Central v. McCall, 2021)Idaho §67-6539 — Short-Term Rental Preemption (HB 216, 2017; HB 583, 2026)Idaho §67-6509A — Manufactured Housing Parity (extended by HB 800, 2026)Idaho Development Impact Fee Act (I.C. §67-8201 et seq.)
Primary-source summary
SB 1354 — ADU by-right (effective 2026-07-01)Trigger predicate
When this evaluates true for a parcel, the law's preempted fields take precedence over base zoning.
city.population ≥ 10000Preempted fields
5 fields on the base district schema are rewritten when the trigger fires.
| Field | Op | Value | Note |
|---|---|---|---|
base_districts[category=res_sf].allowed_uses | add | adu | One ADU per lot permitted by right in cities ≥10,000 |
base_districts[category=res_sf].max_adus_per_lot | floor_at | 1 | |
review_type | waive_discretionary | — | |
base_districts[category=res_sf].parking_ratio_adu | waive | — | Mandatory parking minimums for ADUs prohibited absent documented infrastructure constraints |
hoa_existing_adu_allowance_rescission | override | requires_unanimous_owner_consent | Existing HOAs that currently allow ADUs cannot rescind without unanimous owner consent; new HOAs may ban by covenant |
Citation
Authority source
Idaho SB 1354 (2026)
§ 2026 Idaho Session Laws — SB 1354
Research notes
Part of the March 2026 housing-reform package signed by Governor Little. Applies to cities ≥10,000 population. Cities retain narrow ability to impose parking minimums where documented infrastructure constraints exist.