Newport Beach, CA Fence Regulations: Retaining Walls (2026)
Key Facts
- Max retaining wall height
- 8 feet
- Measured from
- finish grade at wall base
- Wall separation required
- equal to tallest wall, max 6 feet
- Front grade differential wall
- 24 inches at property line
- Exceeding 8 feet requires
- Modification Permit Sec. 20.52.050
Summary
Newport Beach caps retaining walls at 8 feet measured from finish grade at the base of the wall under Municipal Code Section 20.30.040(A)(2), and requires horizontal separation between stacked walls equal to the taller wall's height, capped at 6 feet. Taller walls need a discretionary Modification Permit.
Retaining Walls. The maximum height of a retaining wall shall be eight feet measured from finish grade at the base of the wall, not including any required guardrails. A minimum horizontal separation equal to the height of the tallest retaining wall shall be provided between retaining walls, except that the required separation shall not be more than six feet. The above requirements shall not apply to retaining walls that are an integral part of principal structures. An increase in the height of a retaining wall may be requested in compliance with Section 20.52.050 (Modification Permits).
Full Breakdown
040(A)(2) sets an 8-foot ceiling on retaining wall height, measured from finish grade at the base of the wall and excluding any guardrail required for safety. Where a project stacks more than one retaining wall on a slope, the code requires a minimum horizontal separation between the walls equal to the height of the tallest one, though the City never requires more than 6 feet of separation regardless of how tall the walls are. Retaining walls built as an integral part of a house or other principal structure, such as a walled-in garage level cut into a hillside, are not subject to either the 8-foot cap or the separation rule.
050, a discretionary review by the Community Development Department. Front-yard grade differences get separate treatment under subsection (C)(1): where a lot's grade sits more than 24 inches above the sidewalk or curb, the City allows a 24-inch retaining wall right at the front property line, with each additional stepped-back wall capped at 36 inches and required to sit at least 24 inches back from the wall in front of it. A 42-inch open guardrail, at least 40 percent open material like wrought iron or pickets, is allowed atop the uppermost wall for fall protection.
Retaining wall height is always measured from the existing grade prior to construction under subsection (D), consistent with how fence height is measured on the same lot.
Violations & Fines
Retaining walls built above the 8-foot limit or without the required Modification Permit under Section 20.52.050 are Zoning Code violations that the Community Development Department refers to Code Enforcement under Section 1.04.010, exposing the owner to infraction fines from $100 up to $500 for repeat offenses in a year, misdemeanor charges carrying up to $1,000 and six months in jail, or civil penalties of up to $1,000 per day the wall remains noncompliant.
Frequently Asked Questions
How tall can a retaining wall be in Newport Beach?
What if my backyard needs two stacked retaining walls?
Can I get a taller retaining wall approved?
Sources & Official References
Other rules in Newport Beach
California rules heatmap·Compare Newport Beach to another location·View the California fence regulations overview
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