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Arizona HB 2720 — Middle Housing By-Right in Single-Family Zones (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
Arizona HB 2297 — Accessory Dwelling Units By-RightArizona HB 2721 — Minimum Lot Size ReductionsArizona HB 2110 — Commercial-to-Residential Adaptive ReuseArizona Proposition 207 — Private Property Rights Protection Act
Primary-source summary
HB 2720 — ADU Preemption (2024)

Trigger predicate

When this evaluates true for a parcel, the law's preempted fields take precedence over base zoning.

AND
  • city.population ≥ 30000
  • city.tribal_land_status ≠ tribal
  • parcel.base_zone_category == res_sf

Preempted fields

6 fields on the base district schema are rewritten when the trigger fires.

FieldOpValueNote
base_districts[category=res_sf].allowed_usesaddduplex
base_districts[category=res_sf].allowed_usesaddtriplex
base_districts[category=res_sf].allowed_usesaddfourplex
base_districts[category=res_sf].max_units_per_lotfloor_at4Cities ≥70k must allow up to fourplex in majority of SF zones
base_districts[category=res_sf].max_units_per_lotfloor_at2Phased tier: cities 30k–70k must allow duplex in majority of SF zones
review_typewaive_discretionary—

Citation

Authority source
Arizona HB 2720 (2024) — amending A.R.S. Title 9, Chapter 4
§ HB 2720 §§1–3
https://www.azleg.gov/legtext/56leg/2R/bills/HB2720P.pdf

Research notes

Applies only to cities ≥30,000 population. Cities ≥70k must allow duplex/triplex/fourplex in the majority of single-family zones. Cities 30k–70k must allow duplex in the majority of single-family zones (phased tier). Tribal lands are excluded. Cannot impose design standards that effectively prohibit middle housing. Federal conflict check flags overlap with MAAMF / Luke AFB / Davis-Monthan / Phoenix Sky Harbor Part 77 height and use restrictions on base_districts[*].