kitchen sink rough plumbing

Thanks for the information on the waste pipe size. One more question...when bringing in the waste pipe is there a standard height that I should bring it out of the wall? Would I be better off bring it up thru the floor ? And ,if so, should it be center of sink or offset a little for less trouble in getting the trap in?

The reason I was going to use 1 1/2" for the waste is because I have a cast iron fitting cemented into the basement floor with a 1 1/2" galvanized pipe leaded into its hub. Is there a way to chop out the lead and increase the pipe size to 2" without changing the cast iron fitting?

The diameter of the plumbing from the Main sink IS 1 1/2" which then connects to 2" waste pipe. Bob Villa or not - to suggest 1 1/2 is only found in 'bottom of the line' housing is inexcusable for a man supposedly in the know!
'Code officials' ???? So.....the 'inspections' when you buy and sell a home must either be incompetent or dishonest.

The under the sink plumbing attached to your sinks Main and Food preparation sink (preparation line will invariably have a disposal unit) is 1 1/2 inches.

I dont see a problem with going with a 1 1/2''pipe. Personally i would go a little bigger but worst case scenario there are plenty of affordable options to clean out your drain if it fills up. Things like drano were made for instances like these.

I'm re plumbing my mountain cabin with PEX A. The pipe size from the shut off valve at the house is 3/4". Should I use 3/4 thought the entire house or use a 3/4 "manifold with 1/2" to the fixtures