Inside Sherman city limits, driveway and approach work runs through the city's Self Service Portal, and contractors register with the city. An approach onto a state highway needs a TxDOT access permit. On unincorporated county land there is no residential building permit, but county road rules still govern culverts.
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Who permits your driveway depends on where the driveway meets the road. Inside Sherman, the city's Development Services department handles driveway, approach, and sidewalk work through its online Self Service Portal, the same system that handles building permits and contractor registration; Denison, McKinney, Anna, Melissa, and the other corridor cities run equivalents. Where the driveway connects to a state-maintained highway (US 75 frontage, US 82, US 69, US 377, SH 289, and the FM roads), the approach itself needs a TxDOT access permit regardless of city or county, and TxDOT's Access Management Manual sets the geometry: a residential driveway meets the road at 75 to 90 degrees, tops out at 24 feet wide, carries minimum 15-foot radii, uses an all-weather surface, and cannot dump drainage onto the highway. On unincorporated Grayson, Cooke, Fannin, and Bryan county land, Texas and Oklahoma counties generally do not issue residential building permits, so the driveway itself needs none, but the county road department still governs the culvert and approach where you tie into a county road, and floodplain rules apply where mapped. The practical takeaway: the permit question is answered by the road authority, not the concrete. The written scope here names which authority applies to your address and who pulls what, so none of it surfaces mid-project.