Setback Rules: Altadena vs El Monte
How do setback rules rules compare between Altadena, CA and El Monte, CA?
Altadena and El Monte 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 →El Monte, CA
Los Angeles County
El Monte building setbacks vary by zoning district per Table 17.20-2. ADUs require 4 ft side/rear setbacks. Accessory buildings need 4 ft rear setback, 10 ft from street side on corner lots. Mechanical equipment must be 3 ft from property lines.
View full El Monte rules →Key Facts Comparison
| Fact | Altadena | El Monte |
|---|---|---|
| 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 | - |
| ADU | - | 4 ft side and rear |
| Accessory | - | 4 ft rear, 10 ft street side (corner) |
| Mechanical | - | 3 ft from property line |
| Code | - | Table 17.20-2, Sec. 17.60.130 |
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.
El Monte FAQ
How do I find my setback requirements?
Check El Monte 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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