Tiny Homes: Hesperia vs Ontario
How do tiny homes rules compare between Hesperia, CA and Ontario, CA?
Hesperia has fewer restrictions than Ontario.
Hesperia, CA
San Bernardino County
Hesperia treats permanently sited tiny homes as Accessory Dwelling Units under §16.12.360, allowing detached ADUs up to 1,200 sq ft (minimum 150 sq ft) on lots with an existing single-family residence. Detached ADUs are capped at 16 ft in height with 4-foot side/rear setbacks. Manufactured homes under 10 years old qualify. RVs explicitly do not qualify as ADUs under §16.12.360(E)(2).
View full Hesperia rules →Ontario, CA
San Bernardino County
Foundation-built tiny homes qualify as ADUs under Gov Code 65852.2 in Ontario. Tiny homes on wheels are treated as RVs or park trailers and cannot be used as permanent dwellings on residential lots.
View full Ontario rules →Key Facts Comparison
| Fact | Hesperia | Ontario |
|---|---|---|
| Max Detached ADU Size | 1,200 sq ft livable (§16.12.360(E)(2)) | - |
| Min ADU Size | 150 sq ft (no RVs qualify) | - |
| Max Height (Detached) | 16 ft (18 ft near transit); attached 25 ft | - |
| Setbacks | 4 ft side / 4 ft rear (§16.12.360(E)(4)) | - |
| Min Rental Term | 30 consecutive days (§16.12.360(D)(7)) | - |
| State Authority | Cal. Gov. Code §§65852.2, 65852.22 | - |
| Foundation tiny home | - | Legal as ADU under Gov 65852.2 |
| THOW (wheels) | - | Treated as RV or park trailer |
| Permanent THOW living | - | Not allowed on residential lot |
| ADU size cap | - | Up to ~1,200 sq ft per state |
| Permit | - | Ontario Building and Safety |
Highlighted rows indicate differences between cities.
Hesperia FAQ
Can I live in a tiny home on wheels in Hesperia?
No. Recreational vehicles do not qualify as accessory dwelling units under Hesperia MC §16.12.360(E)(2). To legally live in a tiny home in Hesperia, it must be permanently sited, on a foundation, and permitted as an ADU or a manufactured home under California Health & Safety Code §18007.
How tall can a detached tiny home (ADU) be in Hesperia?
16 feet for a standard detached ADU under §16.12.360(E)(8), or up to 18 feet if located within one-half mile walking distance of a major transit stop, plus up to 2 additional feet to match the roof pitch of the primary home.
Can I Airbnb my Hesperia ADU?
No. Hesperia MC §16.12.360(D)(7) prohibits ADU rentals for terms shorter than 30 consecutive days, so vacation rental and short-term rental use of an ADU is not allowed regardless of platform.
Ontario FAQ
Can I live full time in a tiny home on wheels parked at my Ontario house?
No. A tiny home on wheels is classified as an RV, and using it as a permanent residence on a single-family lot violates the RV occupancy rules and zoning.
Can I build a foundation-based tiny home as an ADU?
Yes. A site-built tiny home on a permanent foundation is a legal ADU under Government Code 65852.2 and must be ministerially approved if it meets state ADU standards.
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