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Graham County adopts ADU (casita) ordinance to comply with state law

Graham County Board of Supervisors · January 5, 2026

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Summary

The board adopted Ordinance 2025-1 adding accessory-dwelling-unit regulations to the county zoning code to comply with House Bill 2928 and cited state statutes, allowing one attached and one detached ADU on lots under an acre and an additional unit on lots above one acre.

Graham County supervisors voted to amend the county zoning ordinance to add provisions regulating accessory dwelling units (ADUs) in compliance with House Bill 2928 (2025) and the cited Arizona Revised Statutes. County staff summarized the county's limited discretion under state law and explained allowable unit counts: on lots smaller than one acre, one attached and one detached ADU are permitted; on lots larger than one acre one additional unit is allowed.

Supervisors discussed the state's limits on local authority and noted the county can still specify certain conditions (for example, types or quality of accessory units and minor stipulations). The county attorney read the ordinance title into the record before the board moved to adopt; the motion passed by voice vote.