Tiny home rules in Fairfield, CA — 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.
Unincorporated Solano County has no separate 'tiny home' ordinance. A tiny house on a permanent foundation is regulated as an ADU or dwelling under Chapter 28; movable tiny houses on wheels are treated as recreational vehicles and cannot be used as permanent residences outside permitted situations.
Solano County does not publish a standalone tiny-home ordinance for unincorporated areas. How a tiny home is treated depends on its construction. A tiny house built on a permanent foundation is regulated as a dwelling or ADU under Chapter 28 and the California Building Code, so it must meet the applicable ADU size, setback, and permit standards - for example the four-foot side and rear ADU setback, district size caps, and a minimum unit floor area of 380 square feet (with limited efficiency-unit exceptions). California ADU law (Gov. Code 66310 et seq.) governs many of these standards for counties on unincorporated land, and a permanent-foundation tiny home meeting ADU criteria gains those state protections. A movable tiny house on wheels is generally classified as a recreational vehicle or manufactured/mobile structure rather than a permanent dwelling; living in an RV on private land is restricted and is not a permitted permanent residence in most zones. Because no single section uses the phrase 'tiny home,' the safest path is to design to ADU/dwelling standards and confirm classification with the Planning Division (707-784-6765) and Building & Safety before purchasing or siting a unit.
Occupying a movable tiny house or RV as a permanent residence where not permitted, or installing a foundation tiny home without ADU/dwelling permits, can trigger code-compliance enforcement, corrections, and removal orders.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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Side-by-side rule comparisons with other cities in Solano County.
See how Fairfield's tiny homes rules stack up against other locations.
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