Although repairs are expensive, in the long run the repairs will save you money from pest control services as well as more extensive repairs. It does not take a very big hole for an insect to gain entrance into your home, and mice only need a quarter of an inch. Inspect your home. Check especially areas where phone lines, cable lines, gas lines, etc. enter your home. If you can see any daylight caulk it up.
Garage doors are notorious for mouse entry.
Often the weather strip wears out on the corners, or was put on wrong. Attic vents have screens, or should have. If they are worn out, or not there, replace them. They are a favorite entry for birds, squirrels, wasps, and silverfish. Also, while in the attic check for other holes and gaps.