Additional fixture not within the bathroom group

[KSdoit]

I'm under IPC. Is connecting a non-bathroom sink (a bar sink) at the location shown in the attached diagram allowable?

 

[wwhitney]

Connecting the bar sink at the location shown means the lavatory can't wet vent the shower. But since you are showing a dry vented shower, that's fine. If the shower didn't have its own dry vent, and was depending on the lavatory for its wet vent, then you'd need the bar sink to connect downstream of the shower.

Cheers, Wayne