Costa Mesa requires building permits for retaining walls exceeding 4 feet in height measured from the bottom of the footing to the top of the wall. Walls over certain heights require engineered plans. Retaining walls near property lines must meet setback requirements.
Under the California Building Code as adopted by Costa Mesa, retaining walls exceeding 4 feet in height (measured from the bottom of the footing to the top of the wall) require a building permit. Walls over 4 feet also require engineered plans prepared by a licensed civil or structural engineer. Retaining walls of any height that retain a surcharge (such as supporting a driveway, structure, or slope above) also require permits and engineering regardless of height. Walls must comply with setback requirements from property lines. Drainage behind retaining walls must be properly addressed to prevent hydrostatic pressure buildup and water damage to adjacent properties. Grading permits may also be required if significant earth is moved. Development Services at (714) 754-5245 reviews retaining wall plans and issues permits. Inspections are required at footing, reinforcement, and final stages.
Building retaining walls without required permits may result in stop-work orders, fines, and mandatory removal or retrofit. Unpermitted walls may also affect property sale and insurance.
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