The most obvious sign of carpenter ant infestation is the presence of workers inside a building or home. However, the presence of ants is not conclusive evidence that a carpenter ant colony has established its nest within a structure. Carpenter ants forage for food within great distances of their nests.
When a carpenter ant infestation is severe, piles of wood shavings can usually be found beneath wooden items. Carpenter ants burrow into wood to create their nests, and an infestation can also be detected by faint rustling noises inside woodwork or walls. Furthermore, when large winged ants emerge from ceilings, walls and other hidden crevices, an infestation is almost certain.