Garage Conversions: Altadena vs Los Angeles
How do garage conversions rules compare between Altadena, CA and Los Angeles, CA?
Los Angeles has fewer restrictions than Altadena.
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 →Los Angeles, CA
Los Angeles County
Garage conversions to ADU allowed under CA state ADU law. No replacement parking required. Existing footprint exempt from setback requirements. Pre-approved plans available.
View full Los Angeles rules →Key Facts Comparison
| Fact | Altadena | Los Angeles |
|---|---|---|
| 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 | - |
| State Law | - | CA Gov Code §65852.2 |
| Setbacks | - | Exempt — existing footprint governs |
| Pre-Approved Plans | - | Available via LADBS |
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.
Los Angeles FAQ
Can I convert my garage into living space in los Angeles?
Garage conversions to ADU allowed under CA state ADU law. No replacement parking required. Existing footprint exempt from setback requirements. Pre-approved plans available.
What permits do I need for a garage conversion in los Angeles?
State Law: CA Gov Code §65852.2. Setbacks: Exempt — existing footprint governs. Replacement Parking: Not required. Pre-Approved Plans: Available via LADBS.
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