Flagstaff, AZ Accessory Structures: ADU Rental Restrictions (2026)

Zoning Code Section 10-40.60.030 governs ADUs citywide and includes a Required Occupancy standard inside Table 10-40.60.030.A that controls how an ADU can be rented. The baseline rule lets the primary Single-Family Dwelling and any ADU on the same lot be leased separately from each other, but only as long-term rental housing, which the table defines specifically as a lease of 90 days or longer or a month-by-month tenancy; anything shorter falls outside that permission. This sits alongside the rest of the ADU standards: no more than one detached ADU and one attached or interior ADU per lot with a single-family home (with a narrow exception for a second detached ADU on a lot of at least one acre containing a Category 1 permanently affordable unit), a two-person occupancy cap per ADU, a size cap of 75 percent of the primary dwelling's gross floor area or 1,000 square feet (whichever is less), and a floor allowing up to 800 square feet regardless of the primary home's size if the other standards are met.

An ADU can never be sold separately from the primary structure, and it cannot be split onto its own lot except through a land division that brings both resulting parcels into compliance with the Zoning Code and Subdivision Ordinance. Home occupations are allowed in the ADU or the primary residence but not both at the same time.