Tiny home rules in San Diego, CA — covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds — determine where they are legal and how they get permitted.
Tiny homes in San Diego are most commonly permitted as Accessory Dwelling Units (ADUs) under SDMC Chapter 14, Article 1, Division 3. Detached ADUs may be up to 1,200 sq ft; units 800 sq ft or smaller are exempt from lot coverage, FAR, and open-space requirements. ADUs up to 16 ft tall may be built at side and rear property lines; taller ADUs require 4-ft setbacks. The minimum ADU size is 150 sq ft. Tiny homes on wheels are not recognized as permanent housing.
San Diego classifies tiny homes based on construction type. Foundation-built tiny homes are treated as standard dwellings and must meet local building codes including minimum square footage (often 400 to 800 sq ft). Tiny homes on wheels (THOW) are typically classified as RVs or mobile homes with different zoning restrictions. Appendix Q of the IRC provides building standards for tiny houses under 400 sq ft. ADU ordinances may provide a pathway for tiny homes as secondary dwellings. Utility connections, septic/sewer, and foundation requirements apply. Some jurisdictions have created specific tiny home zoning districts or overlay zones.
Unpermitted dwellings: removal or retroactive permitting. Zoning violations: fines and required relocation. Occupancy without certificate: prohibited.
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Side-by-side rule comparisons with other cities in San Diego County.
See how other cities in San Diego County handle tiny homes.
See how San Diego's tiny homes rules stack up against other locations.
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