Garage Conversions: Santa Monica vs Topanga
How do garage conversions rules compare between Santa Monica, CA and Topanga, CA?
Santa Monica and Topanga have similar restriction levels.
Santa Monica, CA
Los Angeles County
Santa Monica allows garage conversions to ADUs under SMMC §9.31.025. Replaced parking spaces do not need to be provided. Conversions of existing structures are exempt from setback requirements.
View full Santa Monica 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 | Santa Monica | Topanga |
|---|---|---|
| Code Section | SMMC §9.31.025 | - |
| Replacement Parking | Not required | Not required |
| Setback Exemption | Existing structures exempt | - |
| JADU in Garage | Allowed (attached garage) | - |
| Transit Parking Exempt | Within 1/2 mile of transit | - |
| 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.
Santa Monica FAQ
Can I convert my garage into living space in Santa Monica?
Santa Monica allows garage conversions to ADUs under SMMC §9.31.025. Replaced parking spaces do not need to be provided. Conversions of existing structures are exempt from setback requirements.
What permits do I need for a garage conversion in Santa Monica?
Code Section: SMMC §9.31.025. Replacement Parking: Not required. Setback Exemption: Existing structures exempt. JADU in Garage: Allowed (attached garage).
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.
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