ADU rules in Mohave County, AZ — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
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 broadly allows accessory dwellings on residential land. Ordinance 2025-06 permits one attached and one detached accessory residence on any property zoned for a single-family home, plus an additional detached unit on lots larger than one acre. On lots under five acres, an accessory residence is capped at 75 percent of the primary home's size, extendable with a Special Use Permit. A primary residence must be built or at least permitted first. Arizona's statewide ADU law, HB 2720 (A.R.S. §9-461.18), applies only to municipalities of 75,000 or more people and does not reach unincorporated county land or any Mohave city, since Lake Havasu City, Bullhead City, and Kingman all fall below that threshold.
Building or occupying an accessory residence without a building permit is a code violation subject to stop-work orders and after-the-fact permitting. A unit exceeding the 75 percent size cap without a Special Use Permit is non-compliant.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Mohave County, AZ
Neither Arizona nor Mohave County regulates holiday decorations. No permit is needed for lights, inflatables, or yard displays on your own property. The only...
Mohave County, AZ
In unincorporated Mohave County you may post two garage- or yard-sale signs, each up to four square feet, but only during the sale and for no more than five ...
Mohave County, AZ
Arizona strongly protects political signs. Mohave County's sign ordinance exempts campaign signs in every zoning district, and A.R.S. §16-1019 lets you place...
Mohave County, AZ
Arizona requires every residential rental owner to register the property with the county assessor under A.R.S. §33-1902. In Mohave County you file owner and,...
Mohave County, AZ
Arizona has no just-cause eviction law. The Arizona Residential Landlord and Tenant Act, A.R.S. §33-1301 et seq., governs across Mohave County. A landlord ma...
Mohave County, AZ
Arizona bans local rent control. A.R.S. §33-1329 preempts every city, town, and county, so neither Mohave County nor Kingman, Lake Havasu City, or Bullhead C...
See how Mohave County's adu rules rules stack up against other locations.
Help us keep this page accurate. If you notice an error or outdated information, let us know.