Cosmetic work (cabinets, counters, flooring, paint, fixtures swapped in place) needs no permit. Moving plumbing, gas, or electrical, altering walls, or adding circuits does, in Sherman and every corridor city. On unincorporated county land there is no city permit, but state law still requires licensed trades.
More detail
The permit line in a kitchen runs between replacing and relocating. Swap cabinets, counters, a sink in the same spot, appliances, flooring, and lighting fixtures on existing boxes, and you are doing finish work no corridor city permits. The moment the project moves systems (relocating the sink or gas range, adding a circuit for a double oven or an island, moving or opening a wall, venting a new range hood through the roof), it crosses into permitted work in Sherman (through the Self Service Portal), Denison, McKinney, Anna, and the other incorporated cities, with inspections at rough-in and final. Two wrinkles worth knowing. First, load-bearing walls: opening a kitchen to the living room is the most common structural moment in remodeling, and cities want an engineered beam spec for it, which is also simply what you want holding your roof up. Second, jurisdiction does not change trade law: on unincorporated Grayson, Cooke, or Fannin county land there is no city permit to pull, but Texas licenses electricians and plumbers statewide, and gas work is exactly where that matters; Oklahoma runs the same rule through its Construction Industries Board. Permits here are handled inside the scope (registered contractor, city portal, inspections scheduled), so the homeowner's job is deciding the kitchen, not chasing the paperwork.