Last month I installed drain tile along the foundation in half the basement that was having water issues from hydro static pressure.

What do you guys think is a reasonable cost/sq ft for labor only to install new tile in a shower?  

A couple years later they complain that they don't like carpet and want the owner to install hardwood floors.

It goes up for carpet if you use a "Carpet Installer" : $3.50 - $4.50 (ridiculous, right?).  

I am installing both. 

In my area, once utilities are provided to a lot, there is no hookup/installation cost to re-establish service after demo.

They installed extra lock so I couldn’t get in and check if they moved their stuffs in the bedroom..Since two days have passed already, and I have their move out notice signed and sent them text messages,  Can I have their cars towed and change the locks to get in? 

Many smaller outfits although qualified could take 2-3 days to finish,  opening up potential risk to water damage in case of surprise rain.Are you getting ridge vent installed?

I thought I was being brilliant by installing submeters for all of the units.

Milind, As long as all the piping is rated for gas, and is installed according to code and manufacturers instructions, you should be able to switch between them.