ADU rules in Collin County, TX — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Collin County has no zoning authority over ADUs in unincorporated areas. Property owners may build accessory dwelling units, guest houses, or casitas without county zoning approval, subject only to IRC building permits, septic permits (On-Site Sewage Facility rules), and any deed restrictions/HOA rules.
TX Local Government Code does not grant counties residential zoning power. Unincorporated Collin County ADUs require: building permit for structure over 200 sq ft (IRC 2018), OSSF permit from Development Services if on septic, floodplain review if applicable. No density limits, minimum lot size, or owner-occupancy requirements at the county level. Cities within Collin County regulate ADUs differently: Plano and McKinney treat them as secondary residential; Frisco and Allen have specific ADU standards.
Contact your local code enforcement office for specific penalty information.
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See how Collin County's adu rules rules stack up against other locations.
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