Retaining walls over 4 feet (measured from bottom of footing to top of wall) require a building permit per the California Residential Code adopted via SCC Title 16. Any retaining wall supporting a surcharge (additional structural load like a driveway, building, or pool) requires a permit regardless of height.
CRC §R404 / CBC §1807 govern retaining walls. Sacramento County Building enforces the 4-ft threshold and surcharge rule. Walls require engineered design by a licensed engineer when over 4 ft or when supporting surcharge; lot-line walls also require neighbor coordination and may need additional review if encroaching on easements. Drainage behind retaining walls must comply with County standards to avoid stormwater nuisances.
Unpermitted retaining walls are common code-enforcement targets. After-the-fact permits, engineering fees, and remedial work can be expensive. Failed walls can also trigger civil claims from neighbors.
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