Garage Conversions: South San Gabriel vs Topanga
How do garage conversions rules compare between South San Gabriel, CA and Topanga, CA?
South San Gabriel and Topanga have similar restriction levels.
South San Gabriel, CA
Los Angeles County
LA County allows converting existing garages to ADUs or JADUs in unincorporated areas under the ADU Ordinance. Garage conversions are the most affordable ADU option at roughly $80–$150K. Replacement parking is not required by state law.
View full South San Gabriel rules →Topanga, CA
Los Angeles County
Garage conversions to ADUs in unincorporated Topanga are governed by LA County Code Title 22 §22.140.640 and California Government Code §65852.2. No replacement parking is required when a garage is converted to an ADU, and existing setbacks are preserved. A Coastal Development Permit applies in the Santa Monica Mountains Local Coastal Program area.
View full Topanga rules →Key Facts Comparison
| Fact | South San Gabriel | Topanga |
|---|---|---|
| JADU Max | 500 sq ft | - |
| Replacement Parking | Not required | Not required |
| Permit From | Public Works B&S | - |
| Cost Range | $80K–$150K typical | - |
| State Law | Gov. Code §65852.2 | - |
| Governing Code | - | LA County Code §22.140.640 |
| Existing Setbacks | - | Grandfathered |
| Coastal Permit | - | Required in SMM LCP |
| Permit Required | - | Yes — LA County building |
Highlighted rows indicate differences between cities.
South San Gabriel FAQ
Can I convert my garage to a living space in unincorporated LA County?
Yes. Garage conversions to ADUs or JADUs are allowed under the ADU Ordinance. You need a building permit from Public Works and must meet current building code for habitable space.
Do I need to add replacement parking if I convert my garage?
No. California state law prohibits LA County from requiring replacement parking when a garage is converted to an ADU.
Topanga FAQ
Do I need to add parking if I convert my Topanga 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.
Do I still need a Coastal Development Permit for a garage conversion?
Yes, typically. Most Topanga properties fall within the certified Santa Monica Mountains LCP, so a CDP is required in addition to the building permit unless a categorical exclusion applies.
Who issues the permit for a Topanga garage conversion?
LA County Public Works (Building & Safety) issues the building permit; LA County Regional Planning processes the ministerial ADU review and any Coastal Development Permit.
Compare other topics
See how South San Gabriel and Topanga compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool