Basement built thread. Getting city permit with my awesome drawing :-)

[sphelps]

Originally Posted by The Grizz

I have a bathroom with a shower and a double sink in the main part of my office that are all tied in together with just one main vent, no issues.

Double sinks share a pee trap, so it's no different than a single. In theory if sinks are close enough you could do the same but with sinks in different rooms I doubt it meets code. I'm pretty sure you can tie into the sink vent a certain way but I also think the size of the vent depends on the number of drains. Chances are the floor drain in the mech room is also sharing the bathroom vent and he's adding two more drains. So it's something to look into.