Retaining Walls: Altadena vs Pasadena
How do retaining walls rules compare between Altadena, CA and Pasadena, CA?
Altadena and Pasadena have similar restriction levels.
Altadena, CA
Los Angeles County
Retaining walls in unincorporated LA County under 4 ft from footing to top are exempt from building permits unless supporting a surcharge. Walls in required yards cannot exceed 6 ft. In coastal areas, retaining walls must be terraced and landscaped with native species before the rainy season (Oct 15-Apr 15).
View full Altadena rules →Pasadena, CA
Los Angeles County
Retaining walls up to 4 ft in Pasadena require a zoning permit. Taller retaining walls require a building permit and engineering. Hillside areas have additional design standards to blend structures into terrain per PMC Title 14 and Title 17.
View full Pasadena rules →Key Facts Comparison
| Fact | Altadena | Pasadena |
|---|---|---|
| Permit Exempt | Under 4 ft height | - |
| Yard Maximum | 6 ft in required setbacks | - |
| Coastal | Must terrace and landscape | - |
| Engineering | Soils report for taller walls | Required for taller walls |
| Zoning Permit | - | Up to 4 ft |
| Building Permit | - | Over 4 ft |
| Hillside | - | Enhanced design standards |
Highlighted rows indicate differences between cities.
Altadena FAQ
Do I need a permit for a retaining wall in LA County?
Only if the wall exceeds 4 feet from footing to top. Walls over 4 feet need a building permit and engineered plans from a licensed engineer. Contact Building & Safety at (626) 458-3171.
Can I build multiple short walls instead of one tall one?
Tiered walls with less than the height of the lower wall between them are measured as a single wall for permit purposes. This prevents circumventing the 4-foot permit threshold.
What if my retaining wall is failing?
A failing retaining wall is a safety hazard. Contact Building & Safety at (626) 458-3171 immediately. You may need emergency repairs and a geotechnical evaluation. You are liable for damage to adjacent properties.
Pasadena FAQ
Do I need a permit for a retaining wall?
In Pasadena, walls over 4 feet typically require a building permit and engineered plans. Shorter walls may be exempt.
How close to the property line can I build a retaining wall?
Setback requirements vary. Check Pasadena zoning code for specific distances from property lines.
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