Tiny home rules in Biloxi, MS — 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.
Harrison County applies IRC Appendix Q for foundation-built tiny homes. Tiny homes on wheels treated as RVs/manufactured housing under MS Code §75-49-1. Minimum dwelling size varies by zone. Post-Katrina cottage provisions may allow flexibility.
Mississippi adopts the International Residential Code. Harrison County, Gulfport, and Biloxi treat foundation-built tiny homes (under 400 sq ft) under IRC Appendix Q standards. Minimum dwelling unit sizes vary: typical 600-800 sq ft in R-1, some zones allow smaller. Tiny homes on wheels (THOW) are classified as recreational vehicles or manufactured homes under MS Code §75-49-1 (Manufactured Housing Act) requiring HUD label for permanent residence. RVs cannot be used as permanent dwellings in most residential zones. Post-Hurricane Katrina, Mississippi Cottage (MEMA Cottage) provisions created some flexibility for small manufactured units. ADU ordinances are limited — Gulfport allows accessory dwelling units in certain districts. Utilities must connect to municipal systems or approved septic.
Non-compliant dwelling: no certificate of occupancy, required removal. RV as permanent residence: zoning violation $50-$500/day. Foundation tiny without permit: retroactive permitting with penalties.
Biloxi, MS
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