In most cases, you shouldn’t have to. Many house moving companies know that you are already putting a lot of time and effort into the process, and because their tools for moving the building are so precise, it’s typically fine to leave most things as they are.
If you have things on the walls or fragile items, however, you want to be sure that you pack them up and away. Some people feel more comfortable taking them in a separate vehicle, but it’s not necessary in most instances. Don’t stack any boxes that you put together and be sure that everything is as secure as possible when the house starts to move.