To add a flat roof to a building you will need to add an empty room on the upper level.
Sims 4 add another floor without removing roof.
Hey in this sims 4 video you see how to delete walls floor doors and how you can remove the ground.
This room needs to be the shape and size of the desired roof so you may need to combine several empty rooms together.
Once there is a room on the upper level you can add floor covering and a wall trim to the outer edge.
Building another floor if that is not enough for you or you just want to build your house upwards instead of sideways you can build another and then yet another floor.
How to remove basement ceilings in sims 4 1.
I hope this short tutorial can help you if yes you ca.
Here are a few tips to help you graduate beyond just making a box with windows.
Although the sims 4 has made building houses better than ever it s still a bit tricky to make your dream home.
Hit page up on your keyboard to move up to the second floor view then build the walls floors etc from there.