Current bathroom vanity has one sink want to add another using same water lines and drain

Hi Rmaleeny

If the sinks will be within 30" center to center of each other then you can use one drain/vent pipe, for sure! If the center measures exceed 30" then you will need to install individual drains and vents for each sink.

Water pipes from one sink can feed two sinks so no problem there.

Questions? Let us know, OK?

Mark