Tiny home rules in Coconino County, AZ — covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds — determine where they are legal and how they get permitted.
In Coconino County, a tiny home on a permanent foundation is a dwelling built to the 2018 IRC and can qualify as an accessory dwelling under A.R.S. §11-810.01, while a tiny home on wheels is an RV that cannot be a permanent residence on a standard residential lot.
Classification decides how Coconino County treats a tiny home. A tiny house on a permanent foundation is a dwelling under the 2018 IRC and can serve as the primary home if the lot meets its zone, or as an accessory dwelling under A.R.S. §11-810.01, which allows one attached and one detached unit per single-family lot. The IRC's Appendix Q covers homes 400 square feet or less. Foundations must reach the county's 30-inch frost depth and the roof must carry the local snow load. A tiny home on wheels registered as a travel trailer or park-model RV does not meet building code as a permanent home and cannot be lived in full-time on a standard lot outside a licensed RV park.
Living full-time in a tiny home on wheels on a standard residential lot is a zoning violation subject to penalties. A foundation tiny home built without a permit draws a stop-work order.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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