Retaining walls over 3 feet in height (measured from top of footing to top of wall) require a building permit in unincorporated San Diego County. Walls supporting a surcharge (additional weight or structures above) also require permits regardless of height.
The County Building Division requires permits for retaining walls exceeding 3 feet measured from the top of the footing to the top of the wall. Even shorter walls need permits if they support a surcharge — meaning any weight, fill, structure, or slope behind the wall. Retaining walls over 4 feet in exposed height require engineering by a licensed civil or structural engineer. The County grading ordinance may also apply if significant earth-moving is involved. Drainage behind retaining walls must be properly designed to prevent hydrostatic pressure buildup. Stepped retaining walls with less than 3-foot individual heights may still require permits depending on total configuration.
Unpermitted retaining walls may result in code enforcement action, required removal or engineering retrofitting, and fines. Failed retaining walls causing damage to neighboring property create civil liability.
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Side-by-side rule comparisons with other cities in San Diego County.
See how other cities in San Diego County handle retaining walls.
See how Bonsall's retaining walls rules stack up against other locations.
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