Yes, for a couple of reasons. First, sagging floors can become a tripping hazard for anyone living in your home – particularly children. Without a flat floor, simply walking across the house could be unsafe. Next, a sagging floor indicates a structural problem in your crawl space. If left unchecked, this could spread into other areas of your home. Eventually, your floors and walls could collapse without the proper repairs. Finally, sagging floors make it much harder for your furniture and appliances to stay level. Over time, these items could tip over, potentially causing injury or damage to your home.