Lot Coverage Limits: Castro Valley vs Oakland
How do lot coverage limits rules compare between Castro Valley, CA and Oakland, CA?
Castro Valley and Oakland have similar restriction levels.
Castro Valley, CA
Alameda County
Unincorporated Alameda County limits maximum lot coverage to 35-45 percent in residential zones under Title 17. Coverage includes all structures with roofs, with some exemptions for uncovered decks and pervious surfaces.
View full Castro Valley rules →Oakland, CA
Alameda County
Oakland regulates lot coverage through the Planning Code. Single-family zones typically limit coverage to 40-50%. Commercial and multi-family zones allow higher coverage. Stormwater C.3 requirements may further limit impervious area.
View full Oakland rules →Key Facts Comparison
| Fact | Castro Valley | Oakland |
|---|---|---|
| Typical R-1 coverage | 40 percent maximum | - |
| Hillside zones | Often 35 percent | - |
| Uncovered decks | Under 30 inches exempt | - |
| ADU exception | 800 sf exempt per state law | - |
| FAR overlay | Applies in hillside districts | - |
| Single-Family | - | 40-50% typical maximum |
| Commercial | - | Higher coverage allowed |
| Stormwater C.3 | - | May limit total impervious area |
| Variance | - | Planning Commission approval |
| Includes | - | All roofed structures |
Highlighted rows indicate differences between cities.
Castro Valley FAQ
Does my driveway count toward lot coverage?
No. Driveways and paved walkways are not structures. However, some zones have separate impervious surface limits that include paving.
How do I find my coverage limit?
Check your zoning designation on the Alameda County Planning parcel map, then reference Title 17 for that specific zone.
Oakland FAQ
How much of my lot can I cover?
Single-family zones typically allow 40-50% building coverage. Stormwater requirements may further limit total impervious surface area.
Do patios and driveways count?
Total impervious surface may be regulated separately from building coverage through stormwater C.3 requirements for projects meeting the threshold.
Compare other topics
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