Grading & Drainage: Palo Alto vs Sunnyvale
How do grading & drainage rules compare between Palo Alto, CA and Sunnyvale, CA?
Palo Alto and Sunnyvale have similar restriction levels.
Palo Alto, CA
Santa Clara County
Palo Alto requires grading permits for significant earthwork with drainage plans ensuring runoff does not harm neighbors or overwhelm stormwater systems.
View full Palo Alto 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 | Palo Alto | Sunnyvale |
|---|---|---|
| Permit Trigger | ~50 cu yd or deep excavation | - |
| Retaining Walls | Over 4 ft engineered permit | - |
| Drainage Plans | Required for grading permits | - |
| Neighbor Rights | Cannot divert water onto | - |
| Hillside Review | Geotech for steep lots | - |
| 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.
Palo Alto FAQ
Do I need a permit for landscaping grading?
Minor landscaping below permit thresholds is typically exempt, but substantial regrading, new retaining walls over 4 ft, or drainage changes require permits.
What if a neighbor's grading floods my yard?
Report to code enforcement and document damage. Civil law holds neighbors liable for drainage changes that cause damage, in addition to potential code violations.
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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