ADU rules in Tarrant County, TX — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Tarrant County has no ADU ordinance because Texas counties lack zoning authority. Texas has no statewide ADU mandate. ADUs are effectively unregulated, subject only to HOA rules and floodplain limits.
Unincorporated Tarrant County does not issue ADU permits and does not restrict accessory dwelling units, granny flats, casitas, or garage apartments. Texas has no statewide ADU mandate comparable to California SB 9 or Washington HB 1337. Property owners may build secondary dwellings on their land subject only to HOA deed restrictions and any floodplain or drainage constraints. Tarrant County does require residential construction permits for new homes and additions over 50% of existing value (adopted September 1, 2009), and a new detached ADU generally qualifies. Septic systems for ADUs without city sewer must be designed and permitted through Tarrant County Public Health On-Site Sewage Facility Program. Incorporated cities within Tarrant County generally prohibit ADUs or require specific zoning, but these rules do not apply in unincorporated areas. HOAs commonly ban second dwellings.
TX building code violations for unpermitted residential construction in unincorporated areas can result in stop-work orders plus fines. Septic violations: $500-$5,000 per day. HOA violations enforced civilly.
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See how Tarrant County's adu rules rules stack up against other locations.
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