If you did not authorize the work, he has the right to remove the installed parts and return your system back to the way it was found.

I have the backboard (I prefer cement) installed at the same time as the drywall.

Update @Daniella Sanchez - we just had a structural engineer come out and give us an idea of what work is required, the wall that I need fixed in the basement is bulging out about 3 inches so it either needs a couple of steal beams set up so that it doesn't keep moving OR replace the wall entirely...The bids I'd gotten were mainly for water proofing the basement.. sealing cracks, installing pipes to channel the water elsewhere, etc.

Should I install additional thermostat on the renting unit and better separate the meters.

I have a contractor that wants to install what seems to be a cover board over the bare wood decking of the roof, then the glass base sheet, then the torchdown roofing.

"Break at 3 AM" includes things like removing the icemaker hookup, installing new shut-off valves and flex lines at the sinks and toilets, and putting in a grid drain instead of a pop-up drain in the bathroom sink. 

Installment sales, notes, etc.  

So, like a window air conditioner, but installed in the wall instead of a window?

If it’s substantial I would suggest to sell it at full current value as an installment to an S Corp to get the 121 exclusion.

Or, Google for ads - some of them will advertise things like "80,000 BTU/hr furnace and 3 ton AC installed for $X".