California County Guides
Start here to find planning, building, assessor, GIS, environmental health, septic, and warning-flag research paths by county.
Southern California
Los Angeles County
ADUs are common, but city versus county jurisdiction matters. Tiny homes on wheels are often treated differently than permitted dwellings or ADUs.
Open guideSouthern California
Orange County
Tiny homes and ADUs are usually reviewed through zoning, building, fire, utilities, and parcel-specific constraints. Start with the jurisdiction that controls the parcel, then confirm local interpretations before design.
Open guideInland Empire
Riverside County
Desert, rural, and suburban parcels can have very different utility, septic, fire, and road-access issues even inside the same county.
Open guideInland Empire / High Desert
San Bernardino County
High desert land often requires careful review of water source, septic feasibility, access, fire response, and zoning before purchase.
Open guideSouthern California
San Diego County
Tiny homes and ADUs are usually reviewed through zoning, building, fire, utilities, and parcel-specific constraints. Start with the jurisdiction that controls the parcel, then confirm local interpretations before design.
Open guideCentral Coast
Ventura County
Tiny homes and ADUs are usually reviewed through zoning, building, fire, utilities, and parcel-specific constraints. Start with the jurisdiction that controls the parcel, then confirm local interpretations before design.
Open guideCapital Region
Sacramento County
Tiny homes and ADUs are usually reviewed through zoning, building, fire, utilities, and parcel-specific constraints. Start with the jurisdiction that controls the parcel, then confirm local interpretations before design.
Open guideCentral Valley
Fresno County
Tiny homes and ADUs are usually reviewed through zoning, building, fire, utilities, and parcel-specific constraints. Start with the jurisdiction that controls the parcel, then confirm local interpretations before design.
Open guideCentral Valley / Desert
Kern County
Tiny homes and ADUs are usually reviewed through zoning, building, fire, utilities, and parcel-specific constraints. Start with the jurisdiction that controls the parcel, then confirm local interpretations before design.
Open guideCentral Valley
San Joaquin County
Tiny homes and ADUs are usually reviewed through zoning, building, fire, utilities, and parcel-specific constraints. Start with the jurisdiction that controls the parcel, then confirm local interpretations before design.
Open guideSierra Foothills
Placer County
Tiny homes and ADUs are usually reviewed through zoning, building, fire, utilities, and parcel-specific constraints. Start with the jurisdiction that controls the parcel, then confirm local interpretations before design.
Open guideSierra Foothills
Nevada County
Tiny homes and ADUs are usually reviewed through zoning, building, fire, utilities, and parcel-specific constraints. Start with the jurisdiction that controls the parcel, then confirm local interpretations before design.
Open guideNorth Bay
Sonoma County
Tiny homes and ADUs are usually reviewed through zoning, building, fire, utilities, and parcel-specific constraints. Start with the jurisdiction that controls the parcel, then confirm local interpretations before design.
Open guideCentral Coast
Santa Cruz County
Tiny homes and ADUs are usually reviewed through zoning, building, fire, utilities, and parcel-specific constraints. Start with the jurisdiction that controls the parcel, then confirm local interpretations before design.
Open guideNorth Coast
Humboldt County
Tiny homes and ADUs are usually reviewed through zoning, building, fire, utilities, and parcel-specific constraints. Start with the jurisdiction that controls the parcel, then confirm local interpretations before design.
Open guideNorth Coast
Mendocino County
Tiny homes and ADUs are usually reviewed through zoning, building, fire, utilities, and parcel-specific constraints. Start with the jurisdiction that controls the parcel, then confirm local interpretations before design.
Open guide