Garage Conversions: Altadena vs Burbank
How do garage conversions rules compare between Altadena, CA and Burbank, CA?
Burbank 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 →Burbank, CA
Los Angeles County
Burbank allows conversion of existing garages and accessory structures to ADUs or JADUs under BMC §10-1-620.3, consistent with California Government Code §65852.2. No replacement parking is required when an existing garage is converted to an ADU, and the existing structure's setbacks are grandfathered for the conversion footprint.
View full Burbank rules →Key Facts Comparison
| Fact | Altadena | Burbank |
|---|---|---|
| Governing Code | LA County Code §22.140.640 | - |
| Replacement Parking | Not required | Not required by state law |
| Existing Setbacks | Grandfathered | Grandfathered for conversion |
| Fire-Zone Construction | Chapter 7A in WUI hillside | - |
| Permit Required | Yes — LA County building | Yes — building permit |
| Code Section | - | BMC §10-1-620.3; Cal. Gov Code §65852.2 |
| ADU Over Garage | - | 20 ft to plate / 23 ft to roof |
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.
Burbank FAQ
If I convert my Burbank garage to an ADU, do I need a replacement parking space?
No. Cal. Gov Code §65852.2 and BMC §10-1-620.3 prohibit Burbank from requiring replacement parking when an existing garage is converted to an ADU or JADU.
Can I build a new ADU on top of my Burbank garage?
Yes. Under BMC §10-1-620.3, a detached ADU built on top of a garage or other accessory structure may be up to 20 feet to top of plate and 23 feet to top of roof or architectural feature.
Do I still need a permit for a Burbank garage-to-ADU conversion?
Yes. Burbank Community Development requires a building permit for any change of use from garage to habitable space; the planning review remains ministerial under §10-1-620.7.
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