Tiny Homes: Livermore vs Sunol
How do tiny homes rules compare between Livermore, CA and Sunol, CA?
Livermore and Sunol have similar restriction levels.
Livermore, CA
Alameda County
Tiny homes on foundations qualify as ADUs in Livermore under state law. Tiny homes on wheels (THOWs) are treated as RVs — not legal as permanent dwellings.
View full Livermore rules →Sunol, CA
Alameda County
Unincorporated Alameda County treats a foundation tiny home as an Accessory Dwelling Unit under Title 17 Chapter 17.55 (Ordinance O-2024-32, Sept 2024). ADUs up to 1,200 sq ft are generally by-right under California Government Code Section 65852.2. A tiny house on wheels is classified by HCD as a recreational vehicle under ANSI A119.5 and is not a permanent dwelling.
View full Sunol rules →Key Facts Comparison
| Fact | Livermore | Sunol |
|---|---|---|
| On Foundation | Allowed as ADU | - |
| THOW | RV — not dwelling | - |
| Standard | CRC or HCD MTH | - |
| State Framework | Gov Code §65852.2 | - |
| Full-Time RV Living | Prohibited | - |
| Authority | - | Title 17 Chapter 17.55 (Ord. O-2024-32) |
| ADU By-Right Size | - | Up to 1,200 sq ft (Cal. Gov. Code 65852.2) |
| JADU Max Size | - | 500 sq ft (R-1 only, owner-occupied) |
| Detached ADU Setbacks | - | 4 ft side/rear (state minimum) |
| Tiny Home on Foundation | - | Permitted as ADU (CRC Appendix Q for ≤400 sq ft) |
| Tiny House on Wheels | - | RV per HCD; ANSI A119.5; not a dwelling unit |
| ADU Amnesty Law | - | AB 2533 (Cal. Gov. Code 66332), eff. Jan 1, 2025 |
| Confirm With | - | Alameda County Planning (510) 670-5400 |
Highlighted rows indicate differences between cities.
Livermore FAQ
Can I park a tiny home on wheels in my Livermore backyard?
Short-term storage is allowed, but full-time occupancy of a THOW as a residence is not permitted under Livermore's RV and zoning rules.
Is a foundation tiny home legal as an ADU?
Yes, if it meets California Residential Code and Livermore's ADU standards (minimum size, plumbing, egress, energy).
Sunol FAQ
Can I put a tiny house on wheels in my backyard in unincorporated Alameda County?
California HCD treats tiny houses on wheels as recreational vehicles under ANSI A119.5 standards, not as dwelling units. Alameda County has not published an unincorporated ordinance that authorizes a movable tiny house as a permanent residence the way some California cities have. Confirm with the Alameda County Planning Department at (510) 670-5400 before siting a unit.
What size ADU does Alameda County allow on an unincorporated lot?
Chapter 17.55 of Title 17, adopted by Ordinance O-2024-32, implements California Government Code Section 65852.2. ADUs up to 1,200 square feet are generally available by-right, with a 4-foot side and rear setback minimum for new detached units. Junior ADUs are limited to 500 square feet under Government Code Section 65852.22 and require an owner-occupied R-1 lot.
Does Alameda County allow a tiny house on a permanent foundation?
Yes, when permitted as an Accessory Dwelling Unit under Chapter 17.55. A small foundation-based tiny home of 400 square feet or less can be designed under California Residential Code Appendix Q, which sets specific lofts, ladders, and ceiling-height standards for tiny houses. The unit must still meet ADU setbacks, height, and design standards under Chapter 17.55.
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