ADU Rules: Inglewood vs Topanga
How do adu rules rules compare between Inglewood, CA and Topanga, CA?
Inglewood and Topanga have similar restriction levels.
Inglewood, CA
Los Angeles County
Inglewood allows accessory dwelling units (ADUs) per California state law (SB 9, AB 68). ADUs up to 800 sq ft are permitted by right on single-family lots. Junior ADUs up to 500 sq ft within the existing home are also allowed.
View full Inglewood rules →Topanga, CA
Los Angeles County
Topanga is an unincorporated CDP in Los Angeles County governed by LA County Code Title 22 §22.140.640 (Accessory Dwelling Units and Junior Accessory Dwelling Units), most recently amended April 2024. Detached ADUs are capped at 1,200 sq ft; multifamily-lot ADUs have no maximum size under county rules. Topanga lies within the Santa Monica Mountains Coastal Zone, so a Coastal Development Permit also applies.
View full Topanga rules →Key Facts Comparison
| Fact | Inglewood | Topanga |
|---|---|---|
| Max Size (Detached) | 800 sq ft by right | - |
| JADU | Up to 500 sq ft within existing home | - |
| Setbacks | 4 feet from side and rear | - |
| Impact Fees | Waived under 750 sq ft | - |
| Governing Code | - | LA County Code §22.140.640 |
| Single-Family | - | 1 ADU + 1 JADU per lot |
| Multifamily Detached | - | Up to 2 new + conversion ADUs |
| Coastal Permit | - | Required (Santa Monica Mtns LCP) |
| Side/Rear Setback | - | 4 ft (new construction) |
Highlighted rows indicate differences between cities.
Inglewood FAQ
Can I build an ADU in Inglewood?
Yes. California law allows ADUs up to 800 sq ft by right on single-family lots. Junior ADUs up to 500 sq ft within the existing home are also permitted.
Do I need owner occupancy for an ADU in Inglewood?
Owner occupancy requirements have been relaxed under state law through 2025. Check current regulations as rules may change.
Topanga FAQ
Who regulates ADUs in Topanga?
Topanga is unincorporated, so LA County Department of Regional Planning regulates ADUs under LA County Code Title 22 §22.140.640, not a separate city ordinance.
Do I need a Coastal Development Permit for a Topanga ADU?
Yes. Topanga falls within the certified Santa Monica Mountains Local Coastal Program, so most ADU construction requires a Coastal Development Permit in addition to the building permit.
Can a Topanga multifamily lot add detached ADUs?
Yes. Under LA County Code §22.140.640, multifamily lots may add up to two detached new-construction ADUs plus conversion ADUs within non-livable space (up to 25% of existing units).
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