Tiny home rules in Riverside County, 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.
Riverside County has no separate "tiny home" code. A permanent tiny house on a foundation is treated as an ADU or Second Unit under Ordinance No. 348, Article XIXj; State ADU Law also requires the County to allow a manufactured home as an ADU. A tiny home on wheels (RV) generally cannot be used as a permanent residence.
Unincorporated Riverside County does not have a dedicated tiny-home ordinance. How a small dwelling is regulated depends on its form. A tiny house built on a permanent foundation is treated as an additional residential accommodation under Ordinance No. 348, Article XIXj - typically a detached ADU (max 1,000 sq ft, 16 feet tall, 4-foot side/rear setbacks, Sec. 19.807) or, on lots over 7,200 sq ft zoned for one-family dwellings, a Second Unit. State ADU Law (Gov. Code 66313(a)) requires the County to allow a manufactured home (per Health & Safety Code 18007) to serve as an ADU; HCD's May 2025 review directed Riverside County to add manufactured homes as an allowable ADU type and to remove older "mobilehome" language. The County's ordinance also recognizes "Ranchets" - manufactured-home units in the Eastern Coachella Valley on lots of two or more acres (Sec. 19.807). By contrast, a tiny home on wheels is legally a recreational vehicle; it is not a permitted permanent dwelling and may only be placed where RVs are allowed (such as a licensed RV park), subject to county RV-occupancy limits. Any permanent tiny home requires a building permit and must meet habitability, egress, and fire/life-safety standards; qualifying ADUs are approved ministerially.
Occupying a tiny home on wheels (an RV) as a permanent residence on a standard residential parcel, or placing an unpermitted tiny structure used for sleeping, violates county zoning and can result in code-enforcement action. A foundation-built tiny home without ADU/building permits is an unpermitted dwelling.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Riverside County, CA
On-road motor vehicle noise in unincorporated Riverside County is governed mainly by the California Vehicle Code, which the county's own Noise Element acknow...
Riverside County, CA
Under County Ordinance 413, only the Director of Transportation may paint curbs to mark parking rules in the unincorporated county. Red means no stopping, ye...
Riverside County, CA
County Ordinance 413, Section 1.9, lets the Director of Transportation establish loading and passenger loading zones marked by colored curbs. Yellow zones al...
Riverside County, CA
Movement of oversize or overweight vehicles on unincorporated Riverside County roads requires a permit from the road commissioner under County Code Chapter 1...
Riverside County, CA
Common fencing materials - wood, vinyl, masonry block, and metal - are permitted in unincorporated Riverside County, subject only to Ordinance No. 348 Sectio...
Riverside County, CA
California's SB 1383 requires diverting organic waste from landfills. In unincorporated Riverside County, where green-cart organics collection is offered, re...
See how Riverside County's tiny homes rules stack up against other locations.
Help us keep this page accurate. If you notice an error or outdated information, let us know.