Sanger, CA Fence Regulations: Retaining Walls (2026)

The California Building Code as adopted by Sanger requires a building permit for retaining walls exceeding 4 feet in height measured from the bottom of the footing to the top of the wall. Walls that retain a surcharge load, meaning they support additional weight from a driveway, structure, slope, or adjacent fill, may require a permit regardless of height. Engineering plans stamped by a licensed civil or structural engineer are required for permitted retaining walls, showing soil conditions, drainage, footing design, and reinforcement details. Drainage behind retaining walls is critical in the Central Valley clay soils and must include weep holes or a French drain system to prevent hydrostatic pressure buildup. Retaining walls must observe property line setbacks and may not impede drainage onto neighboring properties. A fence placed on top of a retaining wall counts toward the total height for zoning purposes, meaning a 4-foot retaining wall with a 6-foot fence on top would have a total height of 10 feet and would require both a building permit and likely a variance.