ADU Rules: Hayward vs Sunol
How do adu rules rules compare between Hayward, CA and Sunol, CA?
Hayward and Sunol have similar restriction levels.
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 →Sunol, CA
Alameda County
Sunol is an unincorporated CDP in Alameda County governed by Alameda County Code Title 17 (Zoning), specifically the new Chapter 17.55 (Accessory Dwelling Unit and Junior Accessory Dwelling Unit Ordinance) adopted by Ordinance O-2024-XX in 2024. The County allows one ADU plus one JADU on single-family lots in all residential zones with no minimum lot size, consistent with California Government Code §65852.2.
View full Sunol rules →Key Facts Comparison
| Fact | Hayward | Sunol |
|---|---|---|
| Max ADU size | 1,200 sq ft | - |
| JADU size | Up to 500 sq ft | - |
| Side/rear setback | 4 ft | - |
| Review deadline | 60 days (SB 897) | - |
| Impact fees | Waived under 750 sq ft | - |
| Governing Code | - | Alameda Co. Code Ch. 17.55 |
| Adopted | - | Ord. O-2024-XX (2024) |
| Max Detached ADU | - | 1,200 sq ft |
| Min Lot Size | - | None |
| Septic/Well | - | Alameda Co. EH review required |
Highlighted rows indicate differences between cities.
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.
Sunol FAQ
Who regulates ADUs in Sunol?
Sunol is unincorporated, so the Alameda County Community Development Agency regulates ADUs under Alameda County Code Title 17, Chapter 17.55, adopted in 2024 to implement California Government Code §65852.2.
Is there a minimum lot size for a Sunol ADU?
No. Chapter 17.55 of the Alameda County Code (adopted 2024) eliminated the minimum lot size for ADUs in the unincorporated areas, consistent with state ADU law.
Do I need septic approval for a Sunol ADU?
Yes for parcels not on municipal sewer/water. Alameda County Environmental Health reviews septic-system capacity and well water before the building permit is issued.
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