To much rock, we have to dynamite if you do a basement. Most folks build on slab. I would prefer to have a crawl space but the slab is just way less costly. Plus you don’t go eye to eye with whatever version of snake is in there when you need to be. Only place I like a snake is on a spit. And yes I know there are folks that will passionately tell you about the “good” snakes. I just ain’t met one yet.