To combat this, all you need to do is stick the room above the ground first and delete the doors. If you find yourself choosing a design with doors, you might see an error message appear. READ MORE: How to Rotate Objects in The Sims 4 The basement works in exactly the same way as any other room, so you should be able to “drag and drop” your chosen pre-built room into a basement room. In The Sims 4, you can build pre-decorated rooms and adding these to a basement is easy. Tip Two:- Be careful if you’re adding a pre-built room. That means you need to make sure they lead up into your house and you need to make sure you have a hole in the floor to allow access to the stairs. This works in exactly the same way as it would if you were adding a second floor to your house. If you want to make sure your Sims can actually use the basement space you’ve built when you’re finished, you’re going to need to make sure that you add stairs in as a part of your decorative plans. Tip One:- Always add stairs as soon as you can. The only thing you should be aware of is that there’s no point putting in exterior windows or exterior doors. You can change the height of the walls, add furniture, and decorate it as you please. Once you’ve built the basement area, it can be worked around like any other room in your house.

This means, if you want a tall house, you can have a total of six floors.

When you build a basement in The Sims 4, you can only go two floors down. Who else loves building basement bars? from Sims4

Sims 4 add second floor