kitchen drain waste pipe - outside the wall

Sorry if I am not using the right terms.
We are relocating the kitchen in our house from the front to the back. There is a new drain with venting added for the kitchen waste supply that goes to the roof which is inside the framing. which is besides the new window. The sink is centered to the window and the contractor says per code the waste supply pipe from the sink to the vent and drain supply pipe will be outside and has to make holes in the cabinet (2 feet from the vent supply to the sink) and claims this is how new houses are built. Is this true?

Thanks

I have NEVER done it that way, and I have been doing it for over 60 years.

Thanks for the prompt reply and clarification - I was amazed by this but did not know enough.

Thanks

If that is indeed what he was saying I would fire him on the spot!

This just ain't gonna be pretty if you go ahead with this guy....