ADU Rules: Castaic vs Glendale
How do adu rules rules compare between Castaic, CA and Glendale, CA?
Glendale has fewer restrictions than Castaic.
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 →Glendale, CA
Los Angeles County
Glendale regulates ADUs and JADUs under Glendale Municipal Code (GMC) §30.34.080, with the most recent ordinance amendment adopted by City Council on December 3, 2024 to address California HCD compliance concerns. ADUs and JADUs are reviewed ministerially without a public hearing, consistent with California Government Code §65852.2.
View full Glendale rules →Key Facts Comparison
| Fact | Castaic | Glendale |
|---|---|---|
| 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) | 4 ft (new construction) |
| Code Section | - | GMC §30.34.080 |
| Detached Height | - | 16 ft (18 ft near transit) |
| Attached Height | - | 25 ft, max 2 stories |
| Multifamily Detached New | - | Up to 2 per lot |
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).
Glendale FAQ
How many ADUs can I build on a Glendale multifamily lot?
GMC §30.34.080 implements state law allowing conversion ADUs within non-livable existing multifamily space (up to 25% of existing units) plus up to two detached new-construction ADUs per lot.
How tall can my Glendale detached ADU be?
Detached ADUs are limited to 16 feet under GMC §30.34.080, or up to 18 feet (plus 2 feet for a matching roof pitch) if the property is within a half-mile of a major transit stop or high-quality transit corridor.
Do I need a public hearing for a Glendale ADU?
No. GMC §30.34.080 requires ministerial review without a public hearing, consistent with California Government Code §65852.2.
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