Alhambra, CA Fence Regulations: Retaining Walls (2026)
Key Facts
- Fence atop retaining wall
- 3 ft fence, from retained grade
- Combined wall+fence height cap
- 6 feet above sidewalk
- Permit-exempt retaining wall height
- 4 feet or less
- Permit required if
- Surcharge or Class I/II/III-A liquid
- Governing code sections
- § 23.12.050(A)(1)(a)1; § 20.05.010 (CBC 107.2)
Summary
Where a fence sits atop a retaining wall in Alhambra, the fence itself is capped at 3 feet measured from the retained grade, and the retaining wall plus fence together cannot exceed 6 feet above sidewalk elevation, per Zoning Code § 23.12.050(A)(1)(a)1. A retaining wall of 4 feet or less, unless it holds back a surcharge, needs no building permit under § 20.05.010 (CBC § 107.2).
1. In the event that there is a retaining wall, the maximum height of the fence or wall shall not exceed three feet, measured from the grade of the dirt for which the wall is retaining, but in no event shall the height of the retaining wall, together with the fence or wall, exceed six feet above sidewalk elevation. ... 107.2 Work Exempted... 7. Retaining walls that retain not more than 4 feet (1219 mm) in height measured from the bottom of the footing to the top of the wall, unless supporting a surcharge or impounding a Class I, II, or III-A liquids.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-25: Supplement contains: Local legislation current through Ord. 4851, passed 10-27-25).
Full Breakdown
Alhambra's fence and wall standard folds retaining walls into its 3-foot front/street-side and 6-foot general fence height limits. 050(A)(1)(a)1 addresses the common case of a retaining wall topped by a fence in the front or street-side setback: the fence portion is measured from the grade of the dirt being retained and still cannot exceed 3 feet, but the combined height of the retaining wall and the fence sitting on top of it can never exceed 6 feet above sidewalk elevation. 2, item 7, a retaining wall that retains no more than 4 feet measured from the bottom of the footing to the top of the wall does not need a permit, unless it supports a surcharge (such as a slope, vehicle load, or structure above it) or impounds a Class I, II, or III-A liquid, in which case a permit and engineering review are required regardless of height.
A retaining wall taller than 4 feet, or one carrying a surcharge, must go through the full plan check and permit process, typically with a soils or structural engineer's calculations, before the Building Official will approve construction.
Violations & Fines
A retaining wall built without the required permit, once it exceeds the 4-foot exemption or carries a surcharge, is unpermitted construction that the Building Official can red-tag, requiring after-the-fact engineering review, correction, or removal. A combined retaining wall and fence built over the 6-foot cap in a front or street-side setback is a zoning violation subject to the citywide general penalty of § 1.12.010, fined by Council resolution or up to six months in jail.
Frequently Asked Questions
Do I need a permit to build a retaining wall in Alhambra?
How tall can a retaining wall with a fence on top be?
What triggers the need for a permit on a shorter retaining wall?
Sources & Official References
Other rules in Alhambra
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