Retaining Walls: Fontana vs San Bernardino
How do retaining walls rules compare between Fontana, CA and San Bernardino, CA?
Fontana and San Bernardino 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 →San Bernardino, CA
San Bernardino County
Retaining walls over four feet from the bottom of the footing, or any wall supporting a surcharge, require a building permit and engineered plans under the California Building Code.
View full San Bernardino rules →Key Facts Comparison
| Fact | Fontana | San Bernardino |
|---|---|---|
| Permit Threshold | Retains over 4 ft or with surcharge | Over 4 feet or with surcharge |
| Plans | Stamped structural calcs | - |
| Geotech | Often required over 4 ft | - |
| Drainage | Weep holes or French drain required | - |
| Combined Height | Counts toward fence height | - |
| Engineer | - | Licensed CA engineer stamp |
| Seismic Concern | - | Near San Andreas and San Jacinto faults |
| Building and Safety | - | 909-384-5065 |
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.
San Bernardino FAQ
Do I need an engineer for a three-foot wall?
Generally no if it is less than four feet from the footing and carries no surcharge; taller or loaded walls require engineered plans.
What is a surcharge?
Any load above the wall such as a sloped yard, driveway, or structure that adds pressure; walls with a surcharge need a permit regardless of height.
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