Alabama’s nuisance-bird guidance distinguishes house sparrows, European starlings, and feral pigeons from protected native birds. It also warns that correct identification matters, especially where a house sparrow might be confused with a native species; “small brown bird” is not a sufficient basis for choosing a control method.
The building use differs too. Starlings often nest in cavities, house sparrows fill crevices with nesting material, and feral pigeons use sheltered ledges. That is why a vent problem should not automatically receive the same response as birds roosting on an exterior ledge.
For protected migratory birds, eggs, chicks, and young still dependent on the nest restrict what can be done without authorization. An apparently empty nest is not automatic clearance either: eagle nests have separate protection even when unoccupied, and other applicable requirements still need checking.
For your home, identification and nest status come first. Ask what the inspection found, what work is appropriate now, and how any waiting period affects the later cleanup and protection of the opening.