I cannot place objects in Build/Buy

@carolidunia16 

There's a couple of things you can try but it depends on the platform you are playing on as these only work on PC or Mac.  Won't work for the consoles other than restarting.   I play on PC but there are other helpers here that do play on consoles and Macs so it would be helpful to know what system you play on.

So you can try a restart.  Sometimes, things go a little wonky when you install a pack and start the game the first time afterwards.  And if you use mods or cc, you'll usually have to do that anyway so you can turn on your mods and cc as patches and new packs usually turn them off automatically.

Another thing you can try is to delete the localthumbcache file.  You have to have the game shut down when you do that so you'll need to restart anyway.  No worries with that as the game will create a new one when you next start it up.  And that is a good thing to do if you use cc and have recently added new stuff or taken some out.  All that file does is hold the thumbnails that you see in the game mostly, so you might see that it takes a little time for them to regenerate.

If you use cc though, you might have something that doesn't get along with something in the new pack so you can try starting a new game in a separate The Sims 4 folder without any mods or cc in.  If everything works ok, then that might be what is causing you the problem.  Then you'll have to go through your cc to find what is causing the problem.    In case you don't already know how to start a new game in a separate folder, just move the The Sims 4 folder to your desktop or another folder other than the Electronic Arts folder.  And you might want to try a new game anyway, even if you don't use cc or mods just to make sure that it isn't something else in your main save that is causing the issue.

Hope this helps.