Rot can occur anywhere in the house, but the most likely places are crawlspaces or basements. Floor joists, girders, and sill plates - basically the entire floor framing system under your house – are vulnerable to rot – and making repairs isn't cheap.
LITTLE OR NO DEMOLITION REQUIRED
Imagine a contractor trying to figure out how he's going to crawl under your home to fix the damages and get new beams / repair parts in place, with all the ductwork, wiring, plumbing, and bridging (cross bracing) that are attached to the old rotted joists. In a low crawlspace, take into consideration he will be operating on his back. It's not easy on him, and it's not going to be easy on your bank account.
