Townhouse mice

Background: I live in the Vancouver (BC) area, and I acknowledge that my city is basically one giant rat/mouse nest. We have a neighbor who was a bit of a horder and has passed away. They are now cleaning/renovating the unit (likely for sale) so all the mice that used to make their home there have made their way into our unit and walls. We have two really good traps and are consistently pulling mice out (I think we've gotten 6 in the last 2 months). Bit they're still in the walls and the skratching/movement is keeping us up at night. My question is - since I'm getting mice in the traps I have is it worth hiring some pest control? Would they be able the do something about the ones in the wall, or is it just a loosing battle? (Also, how much should I expect this to cost)