For instance, what is labor rate to install LVP flooring, installing interior doors, installing windows, interior painting, installing Romex, installing electrical panel, removing PEX plumbing and running new, removing trash, installing cabinets, installing counter tops, installing tiles and more.

That usually means a new electrical panel, new circuits, cutting/splicing water runs, heating ducts, etc. 

Upgrade to a 200 amp service with large capacity service panel, and run circuits as per your local codes. 

For instance, what is labor rate to install LVP flooring, installing interior doors, installing windows, interior painting, installing Romex, installing electrical panel, removing PEX plumbing and running new, removing trash, installing cabinets, installing counter tops, installing tiles and more.

I can tell you firsthand - we missed opening up the electric panel on my most recent purchase.

Demolition panels, building the walls, insulation, electrical outlets, move the gas line, install tankless water heater, build awning, along with other things to fix the house.

Rather than having to disconnect a bunch of panels until you get to the damaged one.I'm new to rehab / construction, so wondering how this is really dealt with in the real world.

Not that you have to run separate meters, but each side will need access to their respective panel, or a joint one that is labeled clearly.

This single family house has leased solar panels.

Old electrical panels can be difficult to get circuit breakers or fuses for.