Can You Turn Your Crawl Space Into A Basement? Expanding your crawl space into a full basement is a big job – and it absolutely has to be done right. You’ll need to have the area beneath the home excavated, as well as underpinned. When done wrong, it can cause major structural issues. If you really want to do it – make sure you hire a pro and expect a big bill. There’s no cheap way to do it right. This crawl space in the video is for storage, and built in an area with a high water table (by Mill