The City of Whittier requires a building permit for a retaining wall of any height, the strictest of its fence-related triggers. In the city's hillside areas, the Zoning Code further limits the vertical height of cuts or fills retained by walls to 20 feet from toe to top.
Retaining walls are treated more strictly than ordinary fences in Whittier. Per the City of Whittier Building & Safety FAQ, a building permit is required for a retaining wall of any height, with no minimum exemption. This reflects the structural and drainage risks of earth-retaining structures and is issued by the City's own Building & Safety Division, not Los Angeles County. In Whittier's hillside areas, additional grading and slope rules apply under the H-R Hillside Residential Zone (Zoning Code Chapter 18.14). Section 18.14.080(D) provides that the maximum vertical height of cuts or fills, exposed or retained by walls, from toe to top, shall not exceed 20 feet, and limits the maximum steepness of cuts and fills to a 2:1 ratio with contoured, blended slopes. Hillside development plans must show all proposed retaining walls and protective fences, including their location, height, and material (Section 18.14.060(A)(10)). A retaining wall topped by a fence can combine into a tall structure, so the City reviews combined height and setback. Because retaining walls interact with grading, drainage, and (in hillside zones) slope-stability rules, applicants should coordinate with Whittier Community Development and Building & Safety before construction.
Building a retaining wall without the required permit is a violation that can lead to stop-work orders, after-the-fact permit requirements, and potential removal or reconstruction. In hillside areas, cuts or fills retained by walls exceeding the 20-foot limit or the 2:1 slope standard can be denied or require redesign.
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