Grading & Drainage: Santa Clara vs Sunnyvale
How do grading & drainage rules compare between Santa Clara, CA and Sunnyvale, CA?
Santa Clara and Sunnyvale have similar restriction levels.
Santa Clara, CA
Santa Clara County
Santa Clara requires grading permits for moving 50+ cubic yards of earth, with drainage plans demonstrating runoff does not impact neighbors or city infrastructure.
View full Santa Clara rules →Sunnyvale, CA
Santa Clara County
Grading of 50 cubic yards or more requires a grading permit in Sunnyvale under SMC Title 16. Lot drainage must direct water away from structures and neighbors without causing nuisance.
View full Sunnyvale rules →Key Facts Comparison
| Fact | Santa Clara | Sunnyvale |
|---|---|---|
| Permit Threshold | 50 cubic yards or drainage alteration | - |
| Retaining Walls | Over 4 feet need engineered permit | - |
| Neighbor Impact | Cannot redirect runoff onto adjoining lots | - |
| Slope Trigger | Steeper than 3:1 requires permit | - |
| Contact | Building Division (408) 615-2440 | - |
| Permit threshold | - | 50 cubic yards or 5 ft cut |
| Drainage direction | - | Away from neighbors, to street |
| Geotechnical | - | Required on steep sites |
| LID bioretention | - | May be required |
| Retaining walls | - | Permit over 4 ft tall |
Highlighted rows indicate differences between cities.
Santa Clara FAQ
Do I need a permit to regrade my yard?
Yes, if you move over 50 cubic yards or alter drainage patterns, a grading permit is required.
Can I direct runoff to my neighbor fence line?
No, drainage plans must show runoff is controlled and not concentrated onto adjoining properties.
Sunnyvale FAQ
Do I need a permit for a small backyard regrade?
Not if it is under 50 cubic yards and does not change drainage patterns toward neighbors.
My neighbor's runoff floods my yard - what can I do?
File a complaint with Code Enforcement; diverting drainage onto adjacent property is a violation.
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