@Simslovergirl114 Are your saves otherwise intact, as in, are they mostly up to date with the progress from the last time you played them? The question is whether you're looking at older versions of those saves, from before the new households and lots were placed; or saves that are recent but that have disappearing content, for some reason.
For the first possibility, open a File Explorer window and search for Slot_* (with the asterisk), which should turn up any save files on your hard drive. If you find saves that have recent dates and are possibly not being read by the game, click on one of them, select Open File Location (above the list of files), and let me know the full file path to that particular save.
If your saves are up to date but households or builds have disappeared from them, try loading a backup save. Use the manual method here:
https://sims4.crinrict.com/eng/2014/09/save-games/#wiederherstellen
And make copies of the saves and the backups, in case you need them later.