We had plumber, electrician, and HVAC Tech in house. We would contract when we didn't have either the manpower or tools to do the job or if it involved equipment requiring by law certified licensed contractors. That usually meant mainly the boiler repairs if opened up and the elevator repairs in our case.
Before I got into plumbing, I also did commercial building maintenance and apartment maintenance, for instance I had a maintenance electrician's license, and was maintenance supervisor for 1400 units, but I would never have called any of us "plumber, or electrician, or HVAC Tech ".
I always thought of us as maintenance men or handymen, and in most states that I have been in, they thought so as well.
I don't know why a journeyman would be drawing maintenance man's wages when he could be running his own truck (as a commissioned employee)and making so much more.