Retaining Walls: Hesperia vs Rialto
How do retaining walls rules compare between Hesperia, CA and Rialto, CA?
Hesperia and Rialto have similar restriction levels.
Hesperia, CA
San Bernardino County
Retaining walls in Hesperia require a building permit when over 4 feet in height (measured from bottom of footing to top of wall) or when supporting a surcharge, per California Building Code §105.2 as adopted by Hesperia. Engineered design and plan review apply.
View full Hesperia rules →Rialto, CA
San Bernardino County
Retaining walls in Rialto are governed by California Building Code §105.2 (adopted via Rialto Code Title 15) and zoning standards in §18.61.170. Any retaining wall over 4 feet measured from bottom of footing to top of wall, or any wall supporting a surcharge, requires a building permit.
View full Rialto rules →Key Facts Comparison
| Fact | Hesperia | Rialto |
|---|---|---|
| Permit Threshold | Over 4 ft or any surcharge | Over 4 ft (footing to top) or any wall with surcharge |
| Code Basis | CBC §105.2 / Hesperia Title 15 | - |
| Engineering | Stamped plans required >4 ft | - |
| Seismic Zone | Near San Andreas Fault | - |
| Code Authority | - | CBC §105.2 (CCR Title 24) via Rialto Code Title 15 |
| Zoning | - | Rialto Code §18.61.170 height standards |
| Building & Safety | - | 150 S Palm Ave; 909-820-2505 |
| Boundary Walls | - | Cal. Civ. Code §841 cost-sharing applies |
Highlighted rows indicate differences between cities.
Hesperia FAQ
Do I need a permit for a retaining wall in Hesperia?
Walls 4 feet or less without a surcharge are exempt under CBC §105.2. Anything taller, or supporting backfill/structures, requires a permit and engineered plans.
Does a retaining wall count toward fence height in Hesperia?
Yes. A fence on top of a retaining wall is measured from the high side, and the combined height must comply with Development Code §16.20.072.
Rialto FAQ
Do I need a permit for a 3-foot retaining wall in Rialto?
Generally no, if it does not support a surcharge (vehicle load or sloped soil). California Building Code §105.2 exempts walls 4 feet or less without surcharge.
What if my retaining wall holds up a driveway?
Any retaining wall supporting a surcharge (including a driveway or parked vehicle load) requires a building permit per CBC §105.2, regardless of height. Contact Rialto Building & Safety at 909-820-2505.
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