ADU rules in Brazoria County, TX — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Texas counties cannot zone, so Brazoria County sets no ADU rules in unincorporated areas. Inside a city, the city code governs. Pearland's Old Townsite district expressly allows one additional dwelling unit in an accessory structure.
A Texas county has no zoning power (no Local Government Code Ch. 211 authority), so in unincorporated Brazoria County there is no permit or rule limiting an accessory dwelling unit — only county septic (OSSF, Health & Safety Code Ch. 366), platting (LGC Ch. 232), and floodplain rules apply. If your address is inside a city (Pearland, Lake Jackson, Angleton), that city's Unified Development Code controls whether an ADU is allowed. Pearland permits one additional dwelling unit within an accessory building in its Old Townsite district, subject to size and setback limits.
County enforces only septic, platting and floodplain permits in unincorporated areas; ADU zoning violations, if any, are enforced by your city.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Brazoria County's adu rules rules stack up against other locations.
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