John Gill Commentary Leviticus 14:38

"then the priest shall go out of the house to the door of the house, and shut up the house seven days." — Leviticus 14:38 (ASV)

Then the priest shall go out of the house to the door of the
house
Thereby signifying that it was not fit to be inhabited, and there standing to see it shut up, as follows: and shut up the house seven days :
to observe what alteration would be made in that time, and which would sooner be discovered in a house uninhabited.