I do have all Sims 4 Extension packs and Stuff packs installed and use them regularly in my builds. Please make sure you are patched so that the CC windows and doors are working or get the batch fix at Sims4 Studio. Also, use the cheat bb.moveobjects before placing the room and check for doubles in windows and doors and other wall hangings (also on outside walls) after placing.

All custom content used is available here at TSR

Credits: All artists here at TSR whose objects I use with gratitude. You are a MAJOR inspiration!