Signs you have a rat infestationDamages - rodents have very sharp teeth, which they use readily to gnaw at anything that will help keep them trim. This could be the floor skirting boards, items made from plastic, paper documents or old newspaper, even cables and wires. You may also notice ripped food packages or half-eaten fruits and vegetables that you have been growing in your garden.
Holes and Burrows - Rats are famous for building complex tunnel systems, where they can breed, find shelter or hide their food.
Nests - those you may come across accidentally. Or look around and check all hard-to-reach places: behind or under furniture and larger electrical appliances. The rodents would naturally have their young ones in a hidden and warm place, which is located not far from a food source.