Retaining Walls: Mountain View vs Santa Clara
How do retaining walls rules compare between Mountain View, CA and Santa Clara, CA?
Mountain View and Santa Clara have similar restriction levels.
Mountain View, CA
Santa Clara County
Retaining walls over 4 feet in height (measured from bottom of footing) require a building permit and engineering in Mountain View, with additional scrutiny for walls supporting surcharge loads.
View full Mountain View rules →Santa Clara, CA
Santa Clara County
Santa Clara requires building permits for retaining walls over 4 feet tall or any wall supporting surcharge loads under the California Building Code, with drainage and structural engineering required.
View full Santa Clara rules →Key Facts Comparison
| Fact | Mountain View | Santa Clara |
|---|---|---|
| Permit threshold | Over 4 feet | - |
| Surcharge walls | Permit any height | - |
| Engineering | Typically required | - |
| Combined fence wall | Counted together | - |
| Code reference | CBC 105.2 | - |
| Permit Threshold | - | Over 4 feet tall |
| Surcharge Load | - | Permit at any height |
| Engineering Required | - | Over 4 feet |
| Geotechnical Report | - | Over 6 feet or expansive soil |
| Property Setback | - | 3 feet typical |
Highlighted rows indicate differences between cities.
Mountain View FAQ
Is a 3 foot garden wall permitted?
A freestanding wall under 4 feet without a slope load is typically exempt from permits but must meet zoning setbacks.
What about a 3 foot wall with a 6 foot fence on top?
A combined system of 9 feet will be reviewed together and likely requires both a permit and fence exception.
Santa Clara FAQ
Do I need a permit for a 3-foot retaining wall?
Usually not, if it retains only level ground with no surcharge. Check with the Building Division for site-specific conditions.
Can my retaining wall hold up my driveway?
Yes, but any wall supporting a surcharge load like a driveway requires a permit and engineering regardless of height.
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