Prescott Valley, AZ Accessory Structures: ADU Rules (2026)

Arizona's 2024 ADU legislation (House Bill 2720, codified at A.R.S. §9-461.18) requires municipalities with populations of 75,000 or more to allow at least one attached and one detached ADU per single-family lot by-right. Prescott Valley is below that threshold and is therefore NOT preempted by the state mandate — meaning local Zoning Code controls. Under the Town of Prescott Valley Land Development Code, accessory dwelling units (sometimes called 'guest houses' or 'casitas' in earlier text) are permitted in low-density and rural residential districts subject to lot-size minimums, maximum size limits (typically expressed as a percentage of the primary dwelling's floor area), height limits matching the underlying zone, and standard residential setbacks. Owner-occupancy of either the primary unit or the ADU is commonly required, and short-term rental use (under 30 days) is subject to A.R.S. §9-500.39 (statewide STR licensing). New construction triggers Town building permits, Yavapai County health-department review for septic capacity where municipal sewer is not available, and any applicable HOA review. Confirm your parcel's zoning district and lot size with Prescott Valley Community Development before designing — the rules differ materially between SF-9, SF-12, SF-18, SF-35, and the rural residential zones.