Retaining Walls: Fremont vs San Leandro
How do retaining walls rules compare between Fremont, CA and San Leandro, CA?
San Leandro has fewer restrictions than Fremont.
Fremont, CA
Alameda County
Retaining walls over 3 feet high require engineered permits in Fremont, with extra scrutiny for Mission Peak and Hayward Fault slope areas.
View full Fremont rules →San Leandro, CA
Alameda County
Under the 2022 California Building Code as adopted by San Leandro in SLMC Title 7 Chapter 7-5 (Building Code), a building permit is required for any retaining wall over 4 feet measured from the bottom of the footing to the top of the wall, or for any wall of any height that supports a surcharge (such as a slope or driveway above the wall).
View full San Leandro rules →Key Facts Comparison
| Fact | Fremont | San Leandro |
|---|---|---|
| Permit-Exempt | 3 feet or less | - |
| Surcharge | Always needs permit | - |
| Fault Zone | Alquist-Priolo review | - |
| Hillside | Geotech report | - |
| Typical Fee | 400-1,500 dollars | - |
| Code Section | - | SLMC 7-5 adopting CBC 105.2 |
| Permit Threshold | - | Over 4 ft (footing to top) OR any wall with surcharge |
| Engineering Required | - | Walls over 6 ft total height |
| Department | - | Building & Safety Division |
| Contact | - | (510) 577-3405 |
Highlighted rows indicate differences between cities.
Fremont FAQ
My yard has a 2-foot retaining wall—do I need a permit?
No, as long as the wall is 3 feet or less and does not support a driveway, pool, or other surcharge above it.
Why does Mission San Jose need extra fault review?
The Hayward Fault passes through the area. Alquist-Priolo zones require geological review for many structures to prevent fault-rupture damage.
San Leandro FAQ
Do I need a permit for a retaining wall in San Leandro?
Yes if the wall is more than 4 feet from the bottom of the footing to the top of the wall, OR if it retains a slope, driveway, pool, or any other surcharge regardless of height. Walls 4 feet or less without a surcharge are exempt under CBC 105.2 as adopted in SLMC 7-5.
Can I build a retaining wall on my property line?
Yes, but a wall on or near a property line still needs to meet the zoning rules in SLMC Article 6 for combined wall-plus-fence height (typically 6 feet rear/side, 42 inches front), and a survey is recommended. Walls over 4 feet need a permit even on a property line.
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