I'll join this!
My Milly is 12 months old now and still tries to go in the house! She only goes in hallways (never the bedroom or lounge, where we go to relax), but if she sneaks upstairs when I'm not looking I can guess what she's been doing
I've periodically slept with her in every room in the house, and she has never toileted in those rooms since then, but I don't know if I can bring myself to sleep in the hallways!