Permit Requirements: Altadena vs Downey
How do permit requirements rules compare between Altadena, CA and Downey, CA?
Altadena and Downey have similar restriction levels.
Altadena, CA
Los Angeles County
Fences under 6 ft do not require a building permit in unincorporated LA County. Fences over 6 ft require permits from Building & Safety. Department of Regional Planning approval may be needed depending on fence location (front yard, corner lot). Block walls over 6 ft always require permits.
View full Altadena rules →Downey, CA
Los Angeles County
Fences over 42 inches require a building permit in Downey. Fences at or below 42 inches still need Planning and possibly Engineering approval. Street side yard fences up to 7 ft allowed with 3 ft setback from property line.
View full Downey rules →Key Facts Comparison
| Fact | Altadena | Downey |
|---|---|---|
| Under 6 ft | No building permit needed | - |
| Over 6 ft | Permit required | - |
| Front Yard | May need DRP approval | - |
| Corner Lot | Special visibility requirements | - |
| Permit Threshold | - | Over 42 inches |
| Under 42 in | - | Planning approval still needed |
| Street Side | - | Up to 7 ft with 3 ft setback |
| Corner Cutback | - | 30-inch max for visibility |
Highlighted rows indicate differences between cities.
Altadena FAQ
Do I need a permit for a fence in LA County?
No permit is needed for fences under 6 feet. Fences over 6 feet require a building permit from LA County Building & Safety. Front yard fences are limited to 42 inches in most residential zones.
How tall can my front yard fence be?
42 inches (3.5 feet) in most residential zones under Title 22. This ensures visibility for vehicles and pedestrians. Taller fences may be allowed on corner lots with specific setback compliance.
What about retaining walls?
Retaining walls over 4 feet from footing to top require a building permit and engineered plans. Multiple tiered walls designed to circumvent this limit are treated as a single wall for permit purposes.
Downey FAQ
Do I need a permit to build a fence in Downey?
Fences over 42 inches require a building permit in Downey. Fences at or below 42 inches still need Planning and possibly Engineering approval. Street side yard fences up to 7 ft allowed with 3 ft setback from property line.
How much does a fence permit cost in Downey?
Permit Threshold: Over 42 inches. Under 42 in: Planning approval still needed. Street Side: Up to 7 ft with 3 ft setback. Corner Cutback: 30-inch max for visibility.
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