Retaining walls over 4 feet measured from the bottom of the footing require a Sunnyvale building permit with engineered plans, including drainage, soil pressure, and seismic analysis.
Sunnyvale requires a building permit for any retaining wall over 4 feet in height measured from the bottom of the footing to the top of the wall, or for any wall of any height that supports a surcharge such as a driveway, a swimming pool, or a sloped yard above. Engineered plans prepared by a California-licensed civil or structural engineer must address soil bearing, lateral earth pressure, drainage behind the wall, and seismic demand since Sunnyvale sits near multiple active faults including the Hayward and San Andreas systems. Walls within 3 feet of property lines and walls acting as pool barriers are reviewed for additional compliance. Decorative landscape walls under 4 feet with no surcharge are permit-exempt but must still comply with zoning fence height rules if they sit in a front yard. Sunnyvale hillside and creekside parcels may have additional grading permit requirements.
Contact your local code enforcement office for specific penalty information.
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