We get mice too. The chickens take care of any that get in the coop, but the ones in the house can be a problem they tend to start coming in in the fall when it cools off. We had rats in the shed this summer but the rat snake took care of those. To be honest I think the chickens are better mousers than any of our cats.
a cat was sitting and watching a mouse when a hen grabbed it in front of the cat's nose, lol.