Per the City of Riverside Building & Safety Division and the California Building Code as adopted by Riverside, retaining walls not exceeding 4 feet measured from the bottom of the footing to the top of the wall do not require a building permit unless they support a surcharge or impound Class I, II, or IIIA flammable liquids.
Riverside adopts the California Building Code through RMC Title 16 (Buildings and Construction). Per California Building Code Section 105.2 as adopted by the City and confirmed by Riverside CEDD Building & Safety, retaining walls not over 4 feet in height measured from the bottom of the footing to the top of the wall are exempt from a building permit, unless the wall is supporting a surcharge (such as a structure, driveway, or sloping backfill imposing additional lateral load) or is impounding Class I, II, or IIIA flammable liquids. Any retaining wall over 4 feet, or any wall supporting a surcharge regardless of height, requires a building permit and engineered plans. Riverside Public Works also regulates retaining walls within the public right-of-way through Title 18 (Streets and Sidewalks) and may require an encroachment permit. Riverside is in California seismic Design Category D, so engineered walls must meet seismic lateral-load standards. Walls within FEMA flood hazard zones along the Santa Ana River corridor may trigger additional floodplain review under RMC Title 17 (Floodplain Management).
Building without a required permit is a violation of RMC Title 16 and California Building Code. CEDD Building & Safety may issue a stop-work order and require the wall to be opened up for inspection, re-engineered, or removed. Administrative citations under RMC Ch. 1.17 start at $100/$200/$500. Permit-after-the-fact fees are typically doubled. Failed engineered walls causing damage to neighboring property may also expose the owner to civil liability.
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