Westminster, CA Fence Regulations: Retaining Walls (2026)
Key Facts
- Permit-exempt height
- 4 feet, footing to top of wall
- Governing section
- § 15.04.050, Section 301.2.1(3)
- Measurement point
- Bottom of footing, not just grade
- Taller walls
- Require permit + engineered plans
- Violation type
- Infraction or misdemeanor, per day
Summary
Westminster exempts retaining walls of 4 feet or less, measured from the bottom of the footing to the top of the wall, from a building permit under Section 301.2.1 of the Administrative Code. Taller retaining walls need a permit, plans, and typically engineering review before the Building Official will approve construction.
301.2.1 Building permits. A building permit shall not be required for the following: ... 3. Retaining walls that are not over 4 feet in height measured from the bottom of the footing to the top of the wall. ... Exemption from the permit requirements of this code shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of the technical codes or any other laws or ordinances of the City.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4982734; v10 updated 2026-06-10).
Full Breakdown
050 (Ord. " Measuring from the footing rather than finished grade matters here, because a wall that looks short above ground can still exceed the 4-foot threshold once the buried footing is counted, pulling it out of the exemption and into full permit review. 1, and because retaining walls carry soil loads, the Building Official can require engineered drawings stamped by a licensed engineer before issuing the permit. The code's closing sentence on the exemption list applies here too: even an exempt retaining wall under 4 feet still has to comply with the technical codes and any other applicable city ordinance or law, so drainage, setback, and zoning standards still govern a wall that never needed a permit application.
Violations & Fines
A retaining wall built over the 4-foot footing-to-top threshold without a permit is unpermitted work under Section 205.1, punishable as an infraction or, at the City or District Attorney's discretion, a misdemeanor, with each day it stands unpermitted a separate violation under Section 205.2. The Building Official can order the wall removed or require after-the-fact engineered plans and permitting.
Frequently Asked Questions
Do I need a permit for a retaining wall in Westminster?
Why does the height measurement start at the footing instead of the ground?
Does a retaining wall need an engineer's stamp?
Sources & Official References
Other rules in Westminster
California rules heatmap·Compare Westminster to another location·View the California fence regulations overview
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Retaining Walls in Nearby Cities
How other cities in Orange County handle retaining walls.