Arizona HB 2297 — Accessory Dwelling Units By-Right (AZ)
Tracked preemption from the Arizona overlay bundle.
Overview
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Effective
2024-04-16
Sunset
—
Authority
state
Scope
state:AZ
Other Arizona preemptions
Primary-source summary
**`zoning/us/arizona/overlays.json` labels HB 2720 as "middle housing" and HB 2297 as "ADU".** Per A.R.S. §9-461.18 and the legislative record, **HB 2720 = ADU; HB 2721 = middle housing; HB 2297 = adaptive-reuse precursor (folded into HB 2110 in 2025)**. Swap of overlay IDs `AZ_HB2720_MIDDLE_HOUSING_2024` ↔ `AZ_HB2297_ADU_BY_RIGHT_2024` is needed (with statutory citation also updating from HB 2297 → HB 2720 on the ADU overlay). Logged for human resolution; overlays.json is NOTTrigger predicate
When this evaluates true for a parcel, the law's preempted fields take precedence over base zoning.
AND
city.population≥75000city.tribal_land_status≠tribalparcel.base_zone_category∈ {res_sf,res_mf,res_th,mu}
Preempted fields
4 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 | |
base_districts[category=res_mf].allowed_uses | add | adu | |
review_type | waive_discretionary | — | |
parking_ratio_adu | waive | — |
Citation
Authority source
Arizona HB 2297 (2024) — A.R.S. §9-461.18
§ HB 2297
Research notes
ADU by-right in residential and mixed-use zones. Applies to municipalities with population ≥75,000. Prohibits cities from requiring owner-occupancy, imposing minimum lot size beyond underlying zone, or charging impact fees exceeding proportional share. Tribal lands excluded. Federal conflict check flags MAAMF / AFB height ceiling conflicts.