Tiny Homes: Bonsall vs San Marcos
How do tiny homes rules compare between Bonsall, CA and San Marcos, CA?
Bonsall and San Marcos 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 →San Marcos, CA
San Diego County
San Marcos permits tiny homes on permanent foundations as ADUs under California ADU law (Government Code 65852.2). Tiny homes on wheels are not recognized as permanent dwellings under SMMC.
View full San Marcos rules →Key Facts Comparison
| Fact | Bonsall | San Marcos |
|---|---|---|
| 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 permitted as dwellings |
| Permit | - | Building permit required |
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.
San Marcos FAQ
Can I put a tiny home on my property in San Marcos?
Yes, if it is on a permanent foundation and meets ADU requirements. Tiny homes on wheels cannot serve as permanent residences.
What is the minimum size for a tiny home in San Marcos?
A junior ADU can be as small as 150 sq ft within an existing structure. Detached ADUs can be up to 1,200 sq ft.
Do I need a permit for a tiny home?
Yes, a building permit is required from Development Services at (760) 744-1050 x3233 for any permanent dwelling unit.
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