Structure Height Limits: Altadena vs Downey
How do structure height limits rules compare between Altadena, CA and Downey, CA?
Altadena and Downey have similar restriction levels.
Altadena, CA
Los Angeles County
Altadena R-1 max height: 35 ft on lots ≥20,000 sf; 30 ft on lots <20,000 sf and flag lots. Maximum 2 stories above grade. No portion of any structure may exceed 23 ft if within 15 ft of any property line.
View full Altadena rules →Downey, CA
Los Angeles County
Downey limits single-family homes to 16 ft / 1 story on lots over 2,000 sq ft, and 22 ft / 2 stories on smaller lots. Temporary structures limited to 7 ft. Accessory structures under 120 sq ft may be permit-exempt.
View full Downey rules →Key Facts Comparison
| Fact | Altadena | Downey |
|---|---|---|
| Code Section | Altadena CSD 22.306.070.A.2 | - |
| Max Height ≥20k sf | 35 ft | - |
| Max Height <20k sf | 30 ft | - |
| Flag Lots | 30 ft | - |
| Max Stories | 2 above grade | - |
| Within 15 ft of PL | 23 ft | - |
| Large Lots | - | 16 ft / 1 story max |
| Small Lots | - | 22 ft / 2 stories max |
| Temporary | - | 120 sq ft / 7 ft max |
| Accessory | - | Under 120 sq ft may be exempt |
Highlighted rows indicate differences between cities.
Altadena FAQ
How tall can a house be in Altadena?
35 ft on lots 20,000 sq ft and larger, 30 ft on smaller lots, with a maximum of 2 stories above grade (Altadena CSD 22.306.070.A.2).
Downey FAQ
What is the max height for a house?
Typically 35 feet or 2.5 stories in residential zones. Check Downey zoning code for your specific district.
Do chimneys count toward height?
Chimneys and similar projections are usually exempt up to a limited additional height above the roof.
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