Been in my house 2 years. No issues last winter now it's like a free for all. They're in my walls and under the floorboards and i can hear them in my ceiling.
Problem is i live in a chalet bungalow and have laminate floors throughout so can't lift the floorboards.
Have found possible entry points outside, and have been advised to bait them and then once I hear nothing for 2 days to close up the holes. They've been baited for 2 days and I can still hear them. I caught one in my house in a trap but haven't had visible signs since.
Hate them. Normally stoical with beasties but mice/rats....NO NO NO.