Garage Conversions: Altadena vs Pomona
How do garage conversions rules compare between Altadena, CA and Pomona, CA?
Altadena and Pomona 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 →Pomona, CA
Los Angeles County
Pomona allows garage conversions to ADUs under Ordinance No. 4281 and state law. Converted garages don't require replacement parking. The residential use of garages is regulated under the Zoning Code.
View full Pomona rules →Key Facts Comparison
| Fact | Altadena | Pomona |
|---|---|---|
| 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 | - |
| Setback Exempt | - | Yes, for conversions |
| Height Limit | - | N/A for conversions |
| Code Section | - | Ord. 4281; GC §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.
Pomona FAQ
Can I convert my garage into living space in Pomona?
Pomona allows garage conversions to ADUs under Ordinance No. 4281 and state law. Converted garages don't require replacement parking. The residential use of garages is regulated under the Zoning Code.
What permits do I need for a garage conversion in Pomona?
Replacement Parking: Not required. Setback Exempt: Yes, for conversions. Height Limit: N/A for conversions. Code Section: Ord. 4281; GC §65852.2.
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