Permit Requirements: Altadena vs Los Angeles
How do permit requirements rules compare between Altadena, CA and Los Angeles, CA?
Altadena and Los Angeles 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 →Los Angeles, CA
Los Angeles County
Fences under 6 feet in residential side/rear yards and under 3.5 feet in front yards generally do not require a building permit in LA. Fences exceeding these heights, retaining walls over 3 feet, and any fence with electrical components require LADBS permits. Block wall fences need engineering review.
View full Los Angeles rules →Key Facts Comparison
| Fact | Altadena | Los Angeles |
|---|---|---|
| Under 6 ft | No building permit needed | - |
| Over 6 ft | Permit required | - |
| Front Yard | May need DRP approval | - |
| Corner Lot | Special visibility requirements | - |
| No Permit Needed | - | Under 6 ft side/rear, 3.5 ft front |
| Retaining Walls | - | Permit required over 3 ft |
| Block Walls | - | Engineering review required |
| Agency | - | LADBS |
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.
Los Angeles FAQ
Do I need a permit to build a fence in los Angeles?
Fences under 6 feet in residential side/rear yards and under 3.5 feet in front yards generally do not require a building permit in LA. Fences exceeding these heights, retaining walls over 3 feet, and any fence with electrical components require LADBS permits. Block wall fences need engineering...
How much does a fence permit cost in los Angeles?
No Permit Needed: Under 6 ft side/rear, 3.5 ft front. Retaining Walls: Permit required over 3 ft. Block Walls: Engineering review required. Agency: LADBS.
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