ADU Rules: Livermore vs Sunol
How do adu rules rules compare between Livermore, CA and Sunol, CA?
Livermore and Sunol have similar restriction levels.
Livermore, CA
Alameda County
Livermore must allow ADUs under CA Gov Code §65852.2. Detached ADUs up to 800 sq ft with 4-ft setbacks, JADUs up to 500 sq ft, 60-day permit review.
View full Livermore 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 | Livermore | Sunol |
|---|---|---|
| State Law | Gov Code §65852.2 | - |
| Detached Max | 800-1,200 sq ft | - |
| Setbacks | 4 ft rear/side | - |
| Permit Time | 60 days | - |
| JADU | Up to 500 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.
Livermore FAQ
Can I rent my Livermore ADU on Airbnb?
State law allows long-term rental (30+ days). Livermore's short-term rental rules may restrict or prohibit ADU use for stays under 30 days — check STR ordinance.
Do I need to add parking for my Livermore ADU?
Not if within ½ mile of transit or in certain historic/designated zones under state law. Otherwise, typically one space per unit or bedroom.
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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