quality of life

Has Anyone Ever Had Their House “Rat proofed”?

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“Dear PoPville,

Has anyone ever Rat proofed a house? like with a general contractor who can come in and make serious changes? We have a crawl space under our kitchen and I think that is where they are finding their way in. Its really becoming an issue this summer as we are hearing them in the walls and one got into the house (we killed it). Please help!”