By Jonathan Eberle |

Arizona homeowners will soon have greater freedom to add accessory dwelling units (ADUs) to their properties, thanks to a new law aimed at easing housing constraints and expanding property rights across the state.

House Bill 2928, signed into law last week, was spearheaded by House Majority Leader Michael Carbone. The legislation establishes statewide rules that limit local governments’ ability to restrict ADUs—also known as casitas or guest houses—on lots zoned for single-family homes.

“Arizona homeowners should be able to use their property without being buried in red tape,” said Carbone. “Whether it’s for an aging parent, a young adult, or a rental opportunity, ADUs are a practical solution—and it’s time the law recognized that.”

Under HB 2928, counties must adopt consistent standards by January 1, 2026, or default provisions outlined in the law will automatically take effect. The bill bars local governments from imposing strict design standards, excessive parking requirements, or costly infrastructure upgrades that have historically made ADUs difficult to build.

Key provisions of the law include prohibiting rules that require a preexisting relationship between homeowners and ADU occupants; limiting fees and setback requirements that raise construction costs; and allowing both attached and detached ADUs by right on single-family lots.

The legislation includes carveouts for tribal lands, military zones, high-noise areas, and utility easements. It also permits counties to require septic evaluations where appropriate.

Supporters argue the measure is a meaningful step toward addressing Arizona’s housing affordability challenges. By enabling more flexible use of existing properties, lawmakers say the bill will help ease pressure on housing supply without large-scale development.

“This law gives homeowners more freedom, cuts through bureaucracy, and ensures Arizona families can thrive,” Carbone said.

The reform aligns with broader goals outlined in the House Republican Majority Plan, which emphasizes reducing government intervention and promoting individual rights.

As Arizona continues to experience rapid population growth, lawmakers on both sides of the aisle have expressed interest in finding creative housing solutions. ADUs—long used in other states as a way to increase density without altering neighborhood character—are increasingly seen as a tool to meet that demand.

With HB 2928 now law, the focus shifts to implementation, as counties work to meet the 2026 deadline for adopting the required rules.

Jonathan Eberle is a reporter for AZ Free News. You can send him news tips using this link.