Retaining Walls: Hayward vs San Leandro
How do retaining walls rules compare between Hayward, CA and San Leandro, CA?
San Leandro has fewer restrictions than Hayward.
Hayward, CA
Alameda County
Retaining walls over 3 feet (or retaining a surcharge) need a Hayward permit and engineered design. The Hayward Fault and hillside terrain make seismic and drainage review critical.
View full Hayward 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 | Hayward | San Leandro |
|---|---|---|
| Permit Threshold | Over 3 ft or surcharge | Over 4 ft (footing to top) OR any wall with surcharge |
| Engineered | Required over 4 ft | - |
| Seismic Code | CBC Chapter 18 | - |
| Fault Zone | Alquist-Priolo applies | - |
| Drainage | Weep holes mandatory | - |
| Code Section | - | SLMC 7-5 adopting CBC 105.2 |
| Engineering Required | - | Walls over 6 ft total height |
| Department | - | Building & Safety Division |
| Contact | - | (510) 577-3405 |
Highlighted rows indicate differences between cities.
Hayward FAQ
Is my property in the Hayward Fault zone?
Check the CGS Earthquake Zones of Required Investigation maps; properties in the Alquist-Priolo zone require special geotechnical studies.
Can I stack landscape blocks without a permit?
Only if the total retained height is under 3 feet with no surcharge; taller landscape walls require permits and engineering.
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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