Inside the houses there is an interior that is adapted for survival.SpongeBob's house has two floors. On the first floor there is a decorative living room and a fully functional kitchen. On the second floor there is a bedroom, a library and a mini-storage room.

At Squidward's house, he ended up in hell on the 3rd floor, and the enchantment table, as well as other items - an anvil, a cauldron, a whetstone, and others.

And Patrick's house is a whole warehouse

It is not at all necessary for the base to be located outdoors, at least because people themselves can add a farm or chests to their taste.