If you are saving a house or family that doesn't have cc, you should remove your mod folder from the game entirely before you upload the lot. If you have anything in your mod folder, even if you never used it, your upload will be tagged as "cc" even if *you* didn't use any of the CC.
It also will flag it as having CC if the *only* thing you have in your mod folder is something that isn't really CC but is a gameplay mod. (That's why if you want one of Deligracy's lots you have to check the "include Custom Content" to find them even when she's deliberately only used basegame or basegame with other EP/SP/GPs and no custom content.)
