It is a good idea - what ever way you carry - that it be the same way at all times if possible. Otherwise you are setting yourself up for a hiccup. I would treat "in the house" the same as "out". You never know when you might have reason to step outside, how often, or what emergency might arise. And afterall, that's what pistols are for. As already mentioned, any warning, and it's time to fetch a suitable weapon of choice.