I recently remodeled my bathroom, which could previously only accommodate a 30" single sink vanity, to be able to contain a 60" double sink vanity.

This was done by moving the wall on one side of the original vanity about 30" from where it was.

Looking at the vanity that I want to buy, there are support braces for holding the drawers in the vanity right at about the height of normal stub outs and waste pipes on the very right and left sides of the vanity. i.e. if I plumb (behind the drywall) for two separate sinks, the actual vanity would block the stubs.

Is it normal to plumb one set of stub out right to the center of the vanity (where there's plenty of room) and then T-off inside the vanity for both the supply and waste lines?

Is it normal to plumb one set of stub out right to the center of the vanity (where there's plenty of room) and then T-off inside the vanity for both the supply and waste lines?

I would run one stubout out the open part of the cabinet and wye off from that with two traps to pick up the lavs. I would bring the hot and cold out on either side of the stubout to 1/2 X1/4 X1/4" double angle stops,(see image) and supply both lavs off them. Good luck, Tom

Does the main vent stack for a bath be before the fixtures or can I run it at the end of the 4" waste line?
Thank you carl

Hi Carl...

The main vent stack can be at the end of the run as long as the plumbing fixtures are taken off the main via wye fittings and they are all properly vented as required by your local code.

If the 4" line is accessible you may even want to consider installing a full size test tee fitting (cleanout) in the vent stack in case the bathroom drain ever backs up you can snake the drain without needing to pull the toilet or go on the roof... ;) Just a thought!

Mark