ADU rules in Harris County, TX — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Harris County has no ADU-specific ordinance for unincorporated areas. Accessory dwelling units are not restricted by county zoning (counties cannot zone). Building permits are required. Deed restrictions and HOA rules commonly prohibit ADUs in subdivisions.
Harris County does not have ADU-specific regulations for unincorporated areas because Texas counties lack zoning authority. There are no county-imposed limits on ADU size, height, or occupancy. Building permits from the Office of the County Engineer are required for habitable accessory structures, including electrical, plumbing, and septic permits. ADUs in the 100-year floodplain must comply with Harris County Floodplain Management Regulations (18 inches above base flood elevation). ADUs with on-site sewage facilities need OSSF permits through the County Engineer. Deed restrictions in most master-planned communities prohibit detached living units, guest houses, or secondary dwellings. Texas Property Code does not specifically address ADUs, leaving regulation primarily to private restrictions.
Unpermitted construction: stop-work order, fines. Floodplain violations: county engineering enforcement. Deed restriction violations: civil enforcement, up to $200/day.
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See how Harris County's adu rules rules stack up against other locations.
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