I've seen many people say it would be horrendous to lock a toddler's door. But I've seen equally many people recommend putting a stair gate on the door. I'm feeling pretty stupid, as I don't see why there's any difference. They both prevent the child from getting out without parental assistance.
I've got an almost 2 year old who currently sleeps in his own room, in a cot, with the door closed, which he's fine with. I want to move him to a toddler bed, but he will absolutely get out, open the door and wreak havoc, so I need to prevent him from doing that. I can't fit a stair gate without removing the door, so what would be wrong with a bolt on the outside of the door?