Two levels of basements are possible meaning that our Sims have seven levels of space at their disposal. Building a ceiling or walls on this level is not possible. A fifth level is possible, but this level can only be a deck. Building up, we can build up to four levels of enclosed rooms. When we run out of room on the lot, we can always build up or down. The Sims 4 Building Tutorials: Up and Down: Stairs and Basements by Norma BlackburnĮventually, every builder in the Sims will have the need to make a building larger.