Riverside County, CA Accessory Structures: Carport Rules (2026)

In unincorporated Riverside County, a freestanding carport is regulated as a detached accessory structure under Ordinance No. 348, Section 18.18 (Ord. 348.4997). It must meet the rear-yard setback of the underlying zone and cannot be located closer to the front lot line than the principal dwelling, though the Planning Director may allow a 25-foot minimum front setback where the standard is infeasible (Sec. 18.18.C.3.c). On sloped or elevated lots, a private garage or carport may be built to the front or side lot lines where the design prevents vehicles from exiting directly onto the adjacent roadway (Sec. 18.18.C.3.m). Height may not exceed two stories or 40 feet (Sec. 18.18.C.3.e), and a bare, unpainted metal carport is prohibited on lots of one acre or smaller (Sec. 18.18.C.3.f). The structure may not contain a kitchen or be used for overnight accommodations (Sec. 18.18.C.3.i-j). Off-street parking generally must comply with Section 18.12 of the ordinance. If an existing carport is later converted into an ADU or Junior ADU, no replacement parking is required (Sec. 19.807 F), consistent with California State ADU Law. A building permit is typically required for a carport; confirm thresholds with County Building & Safety.