5 county-level rules, plus city-specific rules for 1 city in Mohave County, Arizona.
Verified from official government sources
Under Mohave County Ordinance 2025-06, any property that allows a single-family home may add one attached and one detached accessory residence, with an extra detached unit on lots over one acre. This is county zoning, not the state HB 2720 municipal law.
Mohave County Ordinance 2025-06 (accessory residences)
one (1) attached and one (1) detached accessory residence for any property that allows a single-family residence
Mohave County exempts a one-story detached shed of 300 square feet or less with no utilities from a building permit, but it must still meet the five-foot accessory-structure setbacks and stay out of easements.
Mohave County Building Ordinance 2021-03 — Work Exempt from Permit (sheds)
One-story detached accessory structures used as tool and storage sheds, playhouses and similar uses, provided the floor area is not greater than 300 square feet and has no utilities to the structure.
Converting a garage into living space in Mohave County is a change of occupancy needing a building permit under the 2018 IRC. Add a kitchen and separate entrance and it becomes an accessory residence under Ordinance 2025-06.
A carport is an accessory structure in Mohave County and generally needs a building permit under the 2018 IRC, with engineered anchorage for high desert winds and compliance with the five-foot accessory-structure setbacks.
Mohave County Ordinance 2025-06 (accessory structure setbacks)
The setbacks for accessory structures has been amended to 5' from the side and rear property lines
In Mohave County, a tiny home on a permanent foundation is a dwelling built to the 2018 IRC and may qualify as an accessory residence, while a tiny home on wheels is an RV that cannot be a permanent residence on a standard residential lot.
1 cities in Mohave County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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Mohave County Ordinance Hub →