Tiny home rules in Collin County, TX — 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 on foundations are regulated in unincorporated Collin County only through IRC building code (min 70 sq ft habitable room, IRC Appendix Q for tiny houses under 400 sq ft). Tiny homes on wheels are RVs under TX Transportation Code and cannot legally serve as permanent residences outside RV parks.
IRC Appendix Q (adopted in TX via 2018 IRC) allows dwellings under 400 sq ft with sleeping lofts, alternating tread stairs, and reduced ceiling heights (6-8 inches in lofts). Requires building permit, OSSF if on septic, and must be on a permanent foundation. Tiny house on wheels = RV: titled through TX DMV, may be occupied only in licensed RV parks or under LGC 232 manufactured home park rules. Several Collin County tiny home villages exist on private leased RV park land.
Contact your local code enforcement office for specific penalty information.
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See how Collin County's tiny homes rules stack up against other locations.
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