Carpet, just something for cats and dogs to crap on.
One can make a permanent floor made of dirt, pounded into forms (adobe or rammed earth–2 different processes). And if like the natives, you want that smooth adobe surface, just get some ox blood and work it in (if you can stand the smell).
Earth, dirt, is the longest used material of building by humans. Once we came out of caves, we made homes from dirt, then rocks (but that’s a real bitch).