ADU Rules: Castro Valley vs Hayward
How do adu rules rules compare between Castro Valley, CA and Hayward, CA?
Castro Valley and Hayward have similar restriction levels.
Castro Valley, CA
Alameda County
Alameda County complies with California Government Code 65852.2 mandating ministerial ADU approval. ADUs up to 1,200 sqft for detached and JADUs up to 500 sqft are allowed on most residential lots.
View full Castro Valley rules →Hayward, CA
Alameda County
Hayward permits ADUs up to 1,200 sq ft and JADUs up to 500 sq ft on single-family and multi-family lots under California Government Code 65852.2.
View full Hayward rules →Key Facts Comparison
| Fact | Castro Valley | Hayward |
|---|---|---|
| State law | Gov Code 65852.2 | - |
| Detached ADU max | 1,200 sqft | - |
| JADU max | 500 sqft | - |
| Side/rear setback | 4 feet | 4 ft |
| Review time | 60 days ministerial | - |
| Max ADU size | - | 1,200 sq ft |
| JADU size | - | Up to 500 sq ft |
| Review deadline | - | 60 days (SB 897) |
| Impact fees | - | Waived under 750 sq ft |
Highlighted rows indicate differences between cities.
Castro Valley FAQ
Do I need a public hearing?
No, ADUs are approved ministerially by county staff under state law; no planning commission or neighbor notice is required if the application meets objective standards.
Can I sell my ADU separately?
AB 1033 (2023) allows separate sale as condominium only if Alameda County opts in by local ordinance; check current county policy.
Hayward FAQ
Can I rent my Hayward ADU short-term?
State law allows cities to prohibit rentals under 30 days; Hayward requires ADUs to be rented for 30 days or longer.
Do I need to add parking?
Not if the ADU is within 1/2 mile of transit or replaces a garage; state law preempts extra parking.
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