Arizona 2026 Regular Session

Arizona House Bill HB4028

Introduced
2/9/26  

Caption

Accessory dwelling units; requirements

Impact

This legislation is likely to expand the availability of housing in municipalities, particularly in urban areas facing housing shortages. By enforcing that municipalities must adopt regulations permitting ADUs, the bill decentralizes housing options, making it easier for property owners to utilize existing space for additional living units. Critics may argue this could lead to overcrowding in certain areas, but proponents emphasize the need for innovative housing solutions in response to rising costs and limited land availability.

Summary

House Bill 4028 proposes amendments to Section 9-461.18 of the Arizona Revised Statutes, focusing on the regulation of accessory dwelling units (ADUs) within municipalities. The bill mandates that municipalities must allow at least one attached and one detached ADU as a permitted use on any lot where a single-family dwelling is permitted. Furthermore, it stipulates that in cases where a lot is one acre or larger, an additional detached ADU is allowed if at least one is designated as a restricted-affordable dwelling unit. This approach seeks to promote housing availability and diversification in residential zones across the state.

Contention

Controversy surrounding HB 4028 centers on the balance between local control and state mandates. Some local governments may view the requirements as an infringement on their zoning authority, raising concerns about the potential for incompatible land uses and the impact on community character. Additionally, opposition from neighborhood groups might stem from worries about increased density and the implications for infrastructure, parking, and public services. As such, the bill may ignite discussions regarding the role of state oversight in local development matters.

Companion Bills

No companion bills found.

Previously Filed As

AZ HB2928

Accessory dwelling units; requirements

AZ SB1110

Accessory dwelling units; codes; owners

AZ HB2783

Accessory dwelling units; population; regulations

AZ HB2159

Prohibited weapon; bump-fire device; accessory

AZ HB2319

Private property; design; regulations; prohibition

AZ SB1529

Municipal housing; preapproved design; annexation

AZ HB2371

Planning; home design; restrictions; prohibition

AZ HB2713

Homeowners' association dwelling actions

AZ HB2309

Vacation rentals; short-term rentals; restrictions

AZ SB1229

Planning; home design; restrictions; prohibition.

Similar Bills

CA AB1154

Junior accessory dwelling units.

CA AB2127

Accessory dwelling units: private sewage disposal systems.

CA SB9

Accessory Dwelling Units: ordinances.

CA AB956

An act to amend Section 50515.

CA SB543

Accessory dwelling units and junior accessory dwelling units.

CA AB1055

Accessory dwelling units: proof of residential occupancy requirements.

CA SB1117

Accessory dwelling units and junior accessory dwelling units.

AZ SB1183

Accessory dwelling units; fire sprinklers