Retaining Walls: Fontana vs Hesperia
How do retaining walls rules compare between Fontana, CA and Hesperia, CA?
Fontana and Hesperia have similar restriction levels.
Fontana, CA
San Bernardino County
Retaining walls in Fontana require a building permit once they retain more than 4 feet of soil measured from the bottom of the footing, or at any height if they support a surcharge. Structural plans, drainage design, and geotechnical review are often required.
View full Fontana rules →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 →Key Facts Comparison
| Fact | Fontana | Hesperia |
|---|---|---|
| Permit Threshold | Retains over 4 ft or with surcharge | Over 4 ft or any surcharge |
| Plans | Stamped structural calcs | - |
| Geotech | Often required over 4 ft | - |
| Drainage | Weep holes or French drain required | - |
| Combined Height | Counts toward fence height | - |
| Code Basis | - | CBC §105.2 / Hesperia Title 15 |
| Engineering | - | Stamped plans required >4 ft |
| Seismic Zone | - | Near San Andreas Fault |
Highlighted rows indicate differences between cities.
Fontana FAQ
Do I need a permit for a 3-foot rockery?
If it retains 3 feet of soil with no surcharge, likely no structural permit, but still follow setback and drainage rules.
My wall failed after rain. What now?
Document the failure and contact Building and Safety. Repair plans may need engineering review, especially if there is slope above.
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.
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