Setback Rules: Altadena vs Los Angeles
How do setback rules rules compare between Altadena, CA and Los Angeles, CA?
Altadena and Los Angeles 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 →Los Angeles, CA
Los Angeles County
Setbacks in LA vary by zoning district under LAMC Chapter I. Typical R1 zone setbacks are 20 ft front, 5 ft side, and 15 ft rear. Hillside areas allow reduced setbacks of 5 ft front and 4 ft side on substandard streets. An encroachment plane at 45 degrees begins 20 ft above setback lines limiting upper story massing. Specific plan areas and overlay zones may impose additional requirements.
View full Los Angeles rules →Key Facts Comparison
| Fact | Altadena | Los Angeles |
|---|---|---|
| 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 | - |
| R1 Front | - | 20 ft typical |
| R1 Side | - | 5 ft typical |
| R1 Rear | - | 15 ft typical |
| Hillside | - | 5 ft front, 4 ft side reduced |
| Encroachment Plane | - | 45 degrees at 20 ft height |
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.
Los Angeles FAQ
How do I find my setback requirements?
Check Los Angeles 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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