Electricians and plumbers
It turns out I'm a huge control freak (which is no surprise to anyone who knows me), so this project has been a real lesson for me. I've had to learn to let go, to accept things on other people's schedules, to trust in the gods!
Should anyone else decide they want to do a school build, make sure the board appoves it, not just your own school. It will save you a world of trouble and anxiety.
As well, Ontario schools are allowed to have students install electrical wiring under the tutelage of their teacher, but otherwise, only electrical contracters can do it. A retired electrician cannot do it. I'm not totally sure why this is, but I think it has something to do with trying to shut down underground economies. In any case, anything electrical must be inspected before it can be hooked up to the grid.
Any solar over 12 volts must also be inspected according to our school board;s safety guy. Ontario seems to have extreme safety rules, so make sure you check things out.
Propane must be installed by a trained propane installer. Even though my friend who does construction says it is one of the easier jobs, you're not allowed to do this in Ontario. Safety first, I guess. I suppose it makes sense too, since you don't want propane leaking or anyone blowing up. Hire your electricians and plumbers. It is easier.