ADU Rules: Castaic vs Inglewood
How do adu rules rules compare between Castaic, CA and Inglewood, CA?
Castaic and Inglewood have similar restriction levels.
Castaic, CA
Los Angeles County
Castaic 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. Single-family lots may add one ADU plus one JADU; multifamily lots may add up to two detached new-construction ADUs plus conversion ADUs created in non-livable existing space.
View full Castaic rules →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 →Key Facts Comparison
| Fact | Castaic | Inglewood |
|---|---|---|
| Governing Code | LA County Code §22.140.640 | - |
| Single-Family | 1 ADU + 1 JADU per lot | - |
| Multifamily Detached | Up to 2 new (20 ft max) | - |
| WUI Fire Zone | Chapter 7A applies | - |
| Side/Rear Setback | 4 ft (new construction) | - |
| 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 |
Highlighted rows indicate differences between cities.
Castaic FAQ
Who regulates ADUs in Castaic?
Castaic is unincorporated, so LA County Regional Planning regulates ADUs under LA County Code Title 22 §22.140.640, not a separate city ordinance.
Are there fire-zone restrictions on Castaic ADUs?
Yes. Portions of Castaic are in LA County's Very High Fire Hazard Severity Zone, so ADUs must meet Chapter 7A wildland-urban interface ignition-resistant construction standards and LA County Fire Code §325 brush clearance.
Can a Castaic 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).
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.
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