Retaining walls 4 feet or less in height (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 hazardous liquids. Walls over 4 feet require a permit and engineered plans.
Yuba City has adopted the California Building Code (CBC) and California Residential Code (CRC) through Title 7 of the Municipal Code. Per the City's Building Division permit guidance and CRC §R105.2, retaining walls not over 4 feet (1219 mm) in height measured from the bottom of the footing to the top of the wall are exempt from a building permit, provided they do not support a surcharge (additional load such as a driveway, structure, or sloping fill above the wall) and do not impound Class I, II, or IIIA liquids. Walls exceeding 4 feet, or any wall supporting a surcharge regardless of height, require a building permit with engineered (stamped) plans. Combined fence-plus-retaining-wall installations are measured as a single structure for fence-height purposes if the wall exceeds 2 feet at the property line.
Building without a required permit triggers Yuba City Code enforcement and California Building Code §110 enforcement remedies. Penalties include a Stop Work Order, double permit fees as an investigation fee under CBC §109.4, and infraction fines of $100/$200/$500 under §1-7.01. The owner may be required to retroactively obtain engineered plans and inspections, or to demolish the wall.
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