Retaining walls in Cupertino are regulated separately from fences and generally require a building permit. In hillside areas, retaining walls facing downhill slopes should be staggered to keep exposed heights at 5 feet or less and be screened with landscaping. A fence added atop a wall counts toward fence height.
Cupertino Municipal Code Chapter 16.28 governs fence heights; retaining walls are structural elements reviewed under the building code and zoning site-development standards. For hillside and RHS-zoned parcels, fences are governed by Section 19.40.080, and city hillside development guidance directs that maximum retaining wall heights facing downhill slopes be staggered so that exposed heights stay at 5 feet or less, with landscaping screening. Because fence height is measured from finish grade to the top of the fence, a fence mounted on top of a retaining wall can push the combined structure above the 6-foot or 3-foot limits, potentially requiring a building permit or Fence Exception. Homeowners should confirm wall permit thresholds with the Building Division before construction.
Unpermitted retaining walls, or fence-on-wall combinations exceeding fence limits, may be cited as building or fence violations and require correction.
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