How to I manage to remove just this part of the floor?

Try closing it off again so it's a room, then try the sledgehammer tool & hover over that floor. Floor SHOULD light up yellow to show what you're going to destroy.

While the Build Mode does have some innovations over TS3, it lacks basic functions like busting away single floor tiles. It's a pain in the butt, and you have to use walls/fences to work around it. I ended up having to fence off an area of my upper floor around the stairs, completely like a room, deleting the chunk of floor I wanted gone, then breaking apart the fence so the upper floor was accessible.

Put your full wall back, then click inside the little room and push or pull the wall all the way to the back wall, then you get rid of wall and floor. :)

Whatever you do just use push and pull because you made a room. you can push the kids' wall over then that part out toward the steps that puts back your kids' wall and gets rid of the other one and floor.

When you push or pull it over to the other wall you will see yellow because one of the walls will poof as it should.

So do that work, it works in my mind. :D

How to fix a hole in your ceiling. from the top looking down, you must click around the edge of the hole or missing ceiling. if all is ok it will show you yellow and it will say build celling. click on that and it will fix that for you

Same with floors that are missing, it will say build floor but you have to click on edge of the floor.

@Stormsview Thanks for the tips! I tried those but maybe I was doing something wrong, but I manage to do it by closing the space, removing the floor, removing the walls, put a "foundation" on the ceiling and then removing the floor again lol

"jupkmn;c-16928529" wrote:
@Stormsview Thanks for the tips! I tried those but maybe I was doing something wrong, but I manage to do it by closing the space, removing the floor, removing the walls, put a "foundation" on the ceiling and then removing the floor again lol

Great job :)

Another thing that causes problems is pulling a wall to close a room. It's better to just build the wall the normal way, with the wall tool.

The trouble I find is the room is not completely closed, when you use the pullover method. You can tell when you add wall texture with the shift key, it's is applied to more than just that room, and sometimes even to parts of the outside.

Building in Sims for is fun because it's like a game. Find How to Build it Game. :) So just try different things as you did. You can build anything you want in Sims 4.

"Starfree;c-16926410" wrote:
Try closing it off again so it's a room, then try the sledgehammer tool & hover over that floor. Floor SHOULD light up yellow to show what you're going to destroy.

I tried that, but it only works if it still with walls, because if I delete them after the floor is already removed, the floor comes back and the ceiling disappears just like this: