Porterville, CA Fence Regulations: Retaining Walls (2026)

Porterville Municipal Code Article 501 establishes the Hillside Zone (HZ) Overlay District, which governs steep-slope parcels within the city. Under section 501.04(B), a swimming pool, spa, pond or associated hardscape and landscape improvement that involves building a retaining wall over three feet in height cannot proceed on a building permit alone: it needs an administrative hillside development permit reviewed by the zoning administrator, plus a separate grading permit and the required building permits before a contractor can break ground. Tennis courts, basketball courts and similar sports courts carry the same grading-and-building-permit trigger.

Once a wall is under review, section 501.06(H), 'Retaining Wall Height Standards,' sets the ceiling: the cumulative height of any retaining wall built to hold back a cut slope or a fill slope cannot exceed six feet, and the code defines 'cumulative height' as the combined height of any single wall or series of stepped walls used to retain one slope, so a builder cannot dodge the cap by stacking shorter walls. Section 501.06(G) also requires retaining walls to follow the natural contour of the slope and to be built of native stone, poured-in-place concrete or precast concrete block finished to blend with the surrounding hillside color and texture.

The Community Development Department reviews hillside development permit applications, and the city engineer signs off on the grading plan before a building permit for the wall itself is issued. These standards apply only within the mapped Hillside Zone (HZ) Overlay District; retaining walls elsewhere in the City of Porterville are reviewed under the standard building permit process rather than Article 501.