Amador County, CA Fence Regulations: Retaining Walls (2026)

Amador County regulates retaining and masonry walls through Title 15, which adopts the California Building Code and lists the local permit exemptions. A freestanding nonbearing masonry or concrete wall without surcharge that is 'not over four feet measured from the bottom of footings to the top of wall' is exempt from a building permit; above four feet, or where the wall supports a surcharge (such as a sloped backfill, driveway, or structure load), a building permit is required. This four-foot threshold mirrors the statewide standard in California Building Code Sec. 105.2, under which retaining walls not over four feet from the bottom of the footing to the top are permit-exempt unless they support a surcharge or impound flammable liquids. Title 19 zoning does not set a separate retaining-wall height cap, but a wall that functions as a structure must respect setbacks, building lines, and the 50-foot road-centerline setback where applicable. In hillside or geologically sensitive areas the Building Department may require engineered plans and geotechnical review even for walls near the exemption threshold. Confirm requirements with the Building Department (209-223-6422) before construction.