YesYobby

How would I do that, exactly?

I know! But my house has open archways that end up counting the rooms in total as an exterior. I'm not too picky on cheating, so even if I could get it in creative I'd be happy. All I'd need is to plug up my archways with the sealant blocks. Thank you, by the way!

Unless I haven't found it, I noticed there's no kind of meta block that could say, seal a room without being detectable by the player. This would make having an open-plan house a little easier, since it would prevent it from being detected as outdoors!