Setback Rules: Altadena vs Santa Monica
How do setback rules rules compare between Altadena, CA and Santa Monica, CA?
Altadena and Santa Monica 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 →Santa Monica, CA
Los Angeles County
Santa Monica R1 district requires a minimum 20 ft front setback (or per Official Districting Map). Side setbacks for multi-unit (R2-R4) adjoining R1 are 10 ft interior and 20 ft rear. Accessory buildings may extend to 5 ft from rear property line.
View full Santa Monica rules →Key Facts Comparison
| Fact | Altadena | Santa Monica |
|---|---|---|
| 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 minimum or per map |
| R2-R4 to R1 | - | 10 ft side, 20 ft rear |
| Accessory Rear | - | 5 ft minimum |
| Code | - | SMMC Ch. 9.07, Ch. 9.21 |
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.
Santa Monica FAQ
How do I find my setback requirements?
Check Santa Monica 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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