Rats are extremely invasive, especially if they find food, water or shelter in abundance. General areas rats thrive are in loft areas, wall cavities, under outbuildings or patio decking.
Once they have set up a good base, it is unlikely they will leave. Unfortunately these little critters have a fantastic memory and even if they are moved, they could potentially find their way back!
Rats can and do live in sewers which can cause them to spread diseases and bacteria to your home… If you see rats in or around your home it’s best to call the professionals as they breed exceptionally quickly which can turn into an infestation before you know it.