Shed Rules: Altadena vs Downey
How do shed rules rules compare between Altadena, CA and Downey, CA?
Altadena has fewer restrictions than Downey.
Altadena, CA
Los Angeles County
Sheds 120 sq ft or smaller and ≤12 ft tall typically don't need a building permit in Altadena, but they still must comply with Altadena CSD setbacks. Anything larger needs a permit.
View full Altadena rules →Downey, CA
Los Angeles County
Downey Municipal Code Article IX regulates accessory structures. Detached accessory structures and attached patio covers may occupy up to 50% of the required rear yard. Structures must comply with setback, height, and lot coverage requirements.
View full Downey rules →Key Facts Comparison
| Fact | Altadena | Downey |
|---|---|---|
| No-Permit Threshold | ≤120 sq ft | - |
| Authority | LA County Title 26 + CBC §105.2 | - |
| Min Setbacks (R-1) | 5 ft side, 5 ft rear | - |
| Lot Coverage | 0.25 × lot + 1,000 sf (CSD 22.306.070.A.4) | - |
| Code Section | - | Art. IX, Ch. 4 |
| Rear Yard Coverage | - | 50% max for accessory structures |
| Max Height | - | One story |
| Small Structures | - | Under 120 sq ft may be permit-exempt |
| Building & Safety | - | (562) 904-7142 |
Highlighted rows indicate differences between cities.
Altadena FAQ
Do I need a permit for a shed in Altadena?
Not if it is 120 sq ft or smaller and has no electrical/plumbing. Larger sheds require a building permit from LA County Building & Safety.
Downey FAQ
Do I need a permit for a shed in Downey?
Small structures under 120 square feet may be exempt from building permits but must meet setback requirements. Larger structures require permits from Building & Safety.
How much of my backyard can a shed cover in Downey?
Detached accessory structures may occupy up to 50% of the required rear yard area under Article IX, Chapter 4.
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