Redlands, CA Fence Regulations: Retaining Walls (2026)

The City of Redlands treats retaining walls under two tracks. For structural safety, the Building & Safety Division's permit-exemption list exempts retaining walls not over 3 feet high (measured from the top of footing to the top of the wall) from a building permit, but a permit is required when a wall is over 3 feet OR when it supports a surcharge (added load such as a slope or structure above) or impounds Class I, II, or III-A flammable liquids. For zoning, RMC Chapter 18.168 governs wall heights, and section 18.168.050 lets a Minor Exception committee grant exceptions specifically pertaining to garden or retaining-wall heights, grading standards, and related items. That committee is composed of the city's Community Development Director (or designee) and two members of the Planning Commission. A retaining wall topped by a fence can also trigger the overall fence-height limits in 18.168.020, so combined height matters. Engineered drawings are typically needed for walls requiring a permit. These local thresholds are more specific than California Civil Code 841, which addresses boundary-fence cost-sharing and not retaining-wall engineering. Always confirm exact requirements with Building & Safety before construction.