Carson follows California Building Code (Title 24 CCR Part 2) adopted by reference in Carson's Building Code chapter. A building permit is required for any retaining wall over 4 feet measured from the bottom of the footing to the top of the wall, or for any retaining wall supporting a surcharge (sloped backfill, driveway load, or impounded fluids). Engineered plans by a licensed civil/structural engineer are required at permit threshold.
Carson's Building Code (eCode360 Building Code chapter) adopts the California Building Code (CBC, Title 24 CCR Part 2) and California Residential Code (CRC, Title 24 Part 2.5). Under CBC §105.2 (Work Exempt from Permit) and CRC §R105.2, retaining walls that are not over 4 feet in height measured from the bottom of the footing to the top of the wall, AND that are not supporting a surcharge or impounding Class I, II or IIIA liquids, are exempt from a building permit. Anything above that threshold — taller walls, walls retaining a slope/driveway/structure, or walls in seismic/expansive soil conditions — requires plan check with engineered drawings stamped by a licensed civil or structural engineer. Carson Building & Safety Division reviews soils reports, sliding/overturning calculations, drainage behind the wall, and reinforcement schedules. Walls supporting structures or in proximity to property lines must meet setback requirements in the zoning code. Combined retaining-wall-plus-fence height is measured from the higher adjacent grade (see height-limits row).
Constructing a regulated retaining wall without a permit triggers a stop-work order, double-fee after-the-fact permit, and possible demolition if engineering review finds the wall unsafe. Failed walls causing damage to neighboring property may expose the owner to civil liability.
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