Garage Conversions: Altadena vs West Covina
How do garage conversions rules compare between Altadena, CA and West Covina, CA?
Altadena and West Covina have similar restriction levels.
Altadena, CA
Los Angeles County
Garage conversions to ADUs in unincorporated Altadena are governed by LA County Code Title 22 §22.140.640 and California Government Code §65852.2. No replacement parking is required when an existing garage is converted, and existing setbacks are grandfathered. Properties in Very High Fire Hazard Severity Zones also trigger Chapter 7A wildland-urban interface standards.
View full Altadena rules →West Covina, CA
Los Angeles County
West Covina allows garage conversions to Accessory Dwelling Units (ADUs) or Junior ADUs (JADUs) under state law and the City's Development Code. Converted garages do not require replacement parking. Each lot may have one ADU and one JADU. ADUs cannot have separate addresses or utilities.
View full West Covina rules →Key Facts Comparison
| Fact | Altadena | West Covina |
|---|---|---|
| Governing Code | LA County Code §22.140.640 | - |
| Replacement Parking | Not required | Not required |
| Existing Setbacks | Grandfathered | - |
| Fire-Zone Construction | Chapter 7A in WUI hillside | - |
| Permit Required | Yes — LA County building | - |
| Max Per Lot | - | 1 ADU + 1 JADU |
| Driveway Width | - | Max 20 ft if converted |
| Code | - | WCMC Ch. 26 Div. 11 |
Highlighted rows indicate differences between cities.
Altadena FAQ
Do I need replacement parking if I convert my Altadena garage to an ADU?
No. Cal. Gov Code §65852.2 and LA County Code §22.140.640 prohibit the county from requiring replacement parking when a garage is converted to an ADU.
Are fire-resistant materials required for an Altadena garage conversion?
Yes, where the property is in a Very High Fire Hazard Severity Zone. Chapter 7A of the California Building Code requires ignition-resistant siding, eaves, vents, windows, and roofing in Altadena's hillside WUI areas.
Who handles the Altadena garage conversion permit?
LA County Public Works (Building & Safety) issues the building permit and LA County Regional Planning handles the ministerial ADU planning review under §22.140.640.
West Covina FAQ
Can I convert my garage to a living space in West Covina?
Yes. File a Second Unit Review (SUR) Application with the Planning Division. The conversion must match the primary unit's exterior and have a separate entrance. Replacement parking is not required.
Can my ADU have its own address and utilities?
No. In West Covina, ADUs and JADUs may not have separate addresses or utilities from the main residence.
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