Individual retaining walls in Yorba Linda may not exceed nine feet and are also subject to Hillside Development rules; combination retaining-and-screen walls up to nine feet need an administrative adjustment.
Under YLMC 18.10.130, the maximum height of individual retaining walls shall not exceed nine feet, and retaining walls are also subject to the provisions of Chapter 18.30 (Hillside Development). A deviation of 11 to 20 percent over the standard fence or wall height, and/or retaining walls and/or combination retaining-and-screen walls up to a maximum height of nine feet, may be approved subject to the granting of an administrative adjustment. Because a screen wall is measured up to six feet toward an adjacent property and up to nine feet toward the subject property, grade changes are reflected in this two-face measurement. Building permits and engineering are typically required for taller retaining walls; confirm with the Building Division.
Retaining walls over nine feet, or built on hillside lots without required review, are code violations subject to correction and permit enforcement.
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