Garage Conversions: Altadena vs Compton
How do garage conversions rules compare between Altadena, CA and Compton, CA?
Altadena and Compton 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 →Compton, CA
Los Angeles County
Compton allows garage conversions to ADUs under Ordinance No. 2341. No replacement parking is required when converting a garage to an ADU under California Government Code.
View full Compton rules →Key Facts Comparison
| Fact | Altadena | Compton |
|---|---|---|
| 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 | - |
| Fire Rating | - | 1-hour for common walls |
| Sound Rating | - | STC 50 minimum |
| Code Basis | - | Ord. 2341 / CA Gov Code 65852.2 |
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.
Compton FAQ
Can I convert my garage into living space in Compton?
Compton allows garage conversions to ADUs under Ordinance No. 2341. No replacement parking is required when converting a garage to an ADU under California Government Code.
What permits do I need for a garage conversion in Compton?
Replacement Parking: Not required. Fire Rating: 1-hour for common walls. Sound Rating: STC 50 minimum. Code Basis: Ord. 2341 / CA Gov Code 65852.2.
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