Setback Rules: Altadena vs Pasadena
How do setback rules rules compare between Altadena, CA and Pasadena, CA?
Altadena and Pasadena have similar restriction levels.
Altadena, CA
Los Angeles County
Altadena R-1 setbacks: front = smallest existing front yard on the same block (min 20 ft); rear = 35 ft (lots ≥20,000 sf) or 25 ft (lots <20,000 sf); side = 10% of avg lot width, min 5 ft interior / 10 ft reverse corner.
View full Altadena rules →Pasadena, CA
Los Angeles County
Pasadena setbacks are set by zoning district under Title 17. Front yards generally require 25 ft minimum. ADU rear yard setback is 10 ft minimum. Attached ADUs above a garage need 5 ft side/rear. Hillside areas use varying setbacks to blend with terrain.
View full Pasadena rules →Key Facts Comparison
| Fact | Altadena | Pasadena |
|---|---|---|
| Code Section | Altadena CSD 22.306.070.A.1 | - |
| Front (min) | 20 ft (or block average) | - |
| Rear ≥20k sf | 35 ft | - |
| Rear <20k sf | 25 ft | - |
| Side Interior | 10% avg lot width, min 5 ft | - |
| Within 15 ft of PL | Max 23 ft tall | - |
| Front Yard | - | 25 feet minimum (typical) |
| ADU Rear | - | 10 feet minimum |
| Attached ADU | - | 5 ft from side/rear lines |
| Hillside | - | Varying setbacks required |
Highlighted rows indicate differences between cities.
Altadena FAQ
What's the front yard setback in Altadena?
Match the smallest existing front yard on the same side of the block, but at least 20 feet — Altadena CSD 22.306.070.A.1.b.
Pasadena FAQ
How do I find my setback requirements?
Check Pasadena zoning map for your parcel’s zoning district, then consult the zoning code for that district’s setbacks.
Can I build closer than the setback?
Only with a variance approved by the zoning board or if your structure qualifies for an exception.
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