Jason comes to the Old House to talk to Willie, asking him what he does for barnabas. Willie replies he does a little carpentry, a little plumbing. I didn't think Barnabas would include any kind of plumbing in the restoration, seeing as how he wants to restore the house to its original state, and that wouldn't include running water. Maybe he's adding a few modern conveniences so when his family drops by, they won't be forced to use an outhouse.