5 rules for unincorporated Modoc County, California.
Verified from official government sources
In unincorporated Modoc County, accessory and junior ADUs are allowed in every zone that permits single-family or multifamily homes, under Zoning Code Section 18.100.010(E). A statewide-exemption ADU may be up to 800 sq ft, 16 ft peak roof height, with 4-foot side and rear setbacks, approved ministerially by building permit within 60 days under California's ADU law.
In unincorporated Modoc County, a shed is an accessory structure permitted alongside a one-family dwelling under Zoning Code Section 18.100.010(D)(1). No accessory building may encroach into a required yard, so a shed must meet the setbacks of its zone (for example, in the Rural Residential zone, 20 ft front/side-street and 30 ft rear/side per Section 18.30.060).
In unincorporated Modoc County, converting a garage or accessory structure into living space is handled as an ADU under Zoning Code Section 18.100.010(E). A converted ADU within an existing accessory structure needs only side and rear setbacks sufficient for fire safety, and when a garage or carport is converted or demolished to build an ADU, replacement parking is not required.
In unincorporated Modoc County, a carport is an accessory structure permitted with a one-family dwelling under Zoning Code Section 18.100.010(D) and may not encroach into the required yards of its zone (Section 18.110.050). When a carport or covered parking is converted or demolished to build an ADU, replacement parking is not required per the County's ADU rules.
In unincorporated Modoc County, an ADU cannot be a tiny home on wheels, RV, yurt or storage structure; the County's ADU guidance requires permanent units of at least 150 sq ft. A registered RV, mobilehome or travel trailer may be used as a temporary residence during construction under Zoning Code Section 18.100.040.
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