El Dorado County, CA Fence Regulations: Retaining Walls (2026)

070 sets the County's fence and retaining wall standards. 3 allows a 50 percent setback reduction for a wall taller than 36 inches when the lot's front-half slope gradient exceeds 25 percent. Even with that reduction, the wall's exposed face cannot exceed seven feet, and any fence built on top of the wall still has to satisfy the Section's height, construction, and cross-visibility area rules. 020, reviewed through the County's discretionary permit process in Article 5. Walls that are needed purely to provide site access, or that stay at or under 36 inches exposed, skip the setback analysis altogether and may even sit within a public utility easement, though never a drainage easement.

Height is not measured in isolation: under Subsection E, if a fence or wall sits on top of, or within five feet of, a retaining wall, the retaining wall's height counts toward the fence's total height for the Section's side and rear yard limits, including any sloped ground between the two features. A building permit under Title 110 is also required once a retaining wall functions as, or supports, a fence taller than seven feet. Because engineered retaining structures on sloped Sierra foothill lots routinely approach these thresholds, most builds beyond a low garden wall end up needing a Minor Use Permit, a building permit, or both before the County will sign off.