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Williamson County, TX Accessory Structures: Tiny Homes (2026)

Few Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Tiny home rules in Williamson 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.

Key Facts

On Wheels
Titled as travel trailer
Permanent Dwelling
Not the RV's use
On Foundation
OSSF permit if plumbed
HOAs
Minimum size can exclude

Summary

A tiny home on wheels is titled as a travel trailer under Texas Transportation Code Section 501.002 and is not used as a permanent dwelling. A tiny home on a foundation with plumbing needs an OSSF septic permit.

These county ordinances apply to unincorporated areas of Williamson County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

is designed primarily for use as temporary living quarters in connection with recreational, camping, travel, or seasonal use; ... is not used as a permanent dwelling

Source: Texas StatutesView official code

Full Breakdown

Texas counties cannot zone, so unincorporated Williamson County sets no minimum house size. Classification depends on construction. A tiny home built on a trailer chassis meets the Transportation Code definition of a travel trailer, designed for temporary living quarters and not used as a permanent dwelling, and it is registered and titled as an RV rather than a house. A tiny home placed on a permanent foundation with a kitchen or bathroom needs an on-site sewage (OSSF) permit under Health & Safety Code Section 366.051. HOA deed restrictions commonly set minimum square footage that excludes tiny homes.

Violations & Fines

Living permanently in a titled travel trailer conflicts with its temporary-use classification. Placing a foundation tiny home on septic without an OSSF permit violates Chapter 366; HOA size minimums are enforced by the association.

Frequently Asked Questions

Can I live in a tiny home on wheels?
It is titled as a travel trailer for temporary use, not a permanent dwelling. The county cannot zone, but HOA deed restrictions and the RV classification constrain full-time living.
Does a tiny home need a septic permit?
A foundation tiny home with plumbing needs an OSSF permit under Section 366.051. A tiny home on wheels uses RV holding tanks and travel-trailer registration.

Sources & Official References

Other rules in Williamson County

Animal Ordinances: Dog Leash LawsFew RestrictionsAnimal Ordinances: Chickens & LivestockFew RestrictionsADU RulesFew RestrictionsGarage ConversionsLight RestrictionsAnimal Ordinances: Exotic PetsLight RestrictionsAnimal Ordinances: Breed RestrictionsFew RestrictionsLandscaping Rules: Artificial TurfFew RestrictionsLandscaping Rules: Native PlantsFew Restrictions

All Williamson County rules

Texas rules heatmap·Compare Williamson County to another location·View the Texas accessory structures overview

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