Work Hermit
A person who only leaves the safety of their own home to go to a place of employment. These people leave their home solely for the purpose of going to work.
Peter: Yo Jim, wanna come for a drink?

Jim: No, i have to work in the morning.

Peter: Ya, but you're home now and you're always working. Just come grab a few with me and the guys.

Jim: No, i'll stay in and play WOW

Peter: You're such a work hermit. All you do is stay in or work!