If the rats are entering the house from outside, the entry points in the property should be closed with the right material, because rats can eat wood.
The agency hired to get rid of rats will also have to select the most appropriate way to eliminate them. There are many ways of getting rid of rats like rat poison, glue traps, metal cage traps and the effectiveness of these methods will vary to a very great extent. Usually in families with pets and small children, using poison is very risky, so other methods have to be used. Metal cage traps are often not very effective for catching the rats as the rat may not enter the cage. Glue traps for rats may catch some of the rats, however the right size should be selected , because larger rats may be able to break free if they are trapped in smaller traps.