My SO and I avoid wearing street shoes in the house. We don't ask visitors to do the same, but most see our line of shoes in the entry, and follow suit. At home I usually wear slippers, both for warmth and because it is more comfortable when standing on hard surfaces. We have no wall-to-wall-carpet, just area rugs here and there. When visiting, I follow the customs of my host. I have some friends who, like us, leave shoes at the door, and will often bring my slippers along when I visit.