Tiny Homes: Bonsall vs Vista
How do tiny homes rules compare between Bonsall, CA and Vista, CA?
Bonsall and Vista have similar restriction levels.
Bonsall, CA
San Diego County
Tiny homes in unincorporated San Diego County are regulated differently based on type. Tiny homes on foundations are treated as ADUs (up to 1,200 sq ft detached). Tiny homes on wheels are treated as RVs and cannot serve as permanent dwellings. Building permits required for foundation-based tiny homes.
View full Bonsall rules →Vista, CA
San Diego County
Vista permits tiny homes on foundations as ADUs under state ADU law. Tiny homes on wheels (THOWs) are not recognized as permanent dwellings under VMC. Minimum dwelling unit sizes apply per the development code.
View full Vista rules →Key Facts Comparison
| Fact | Bonsall | Vista |
|---|---|---|
| On Foundation | Treated as ADU — permits required | - |
| On Wheels | Treated as RV — not permanent dwelling | - |
| Max ADU Size | 1,200 sq ft detached | 1,200 sq ft detached |
| Building Code | Full compliance required for foundation | - |
| RV Residence | Not permitted as primary dwelling | - |
| Min JADU Size | - | 150 sq ft |
| THOWs | - | Not allowed as dwellings |
| ADU Setback | - | 4 ft side/rear |
Highlighted rows indicate differences between cities.
Bonsall FAQ
Can I build a tiny home in unincorporated San Diego County?
Yes, if it is on a permanent foundation. It will be regulated as an ADU with a maximum of 1,200 sq ft and must meet all building code requirements. A building permit from County PDS is required.
Can I live in a tiny home on wheels?
No. Tiny homes on wheels are classified as recreational vehicles and cannot be used as permanent residences under county zoning regulations.
What are the minimum size requirements?
California building code requires habitable rooms to be at least 70 sq ft with a 7-foot minimum ceiling height. There is no county-specific minimum square footage for an ADU beyond building code requirements.
Vista FAQ
Can I live in a tiny home on wheels in Vista?
No, tiny homes on wheels are classified as RVs and cannot be used as permanent residences on residential lots in Vista.
What is the minimum size for a tiny home in Vista?
A junior ADU can be as small as 150 sq ft. Standard detached ADUs can be up to 1,200 sq ft.
Do I need a permit for a tiny home on a foundation?
Yes, it must be permitted as an ADU through Community Development at (760) 639-6100 and meet all building code requirements.
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