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Gotcha. By extension, since the sink cleanout (~2ft away) is not part of the main stack, it would not be permissible to tie into that as an alternative right? Really appreciate all of the help you guys have given me. None of the three plumbers I got quotes from mentioned doing any venting at...

Follow up to this. The clean out is part of a stack for the toilet. Since the ptrap ties directly into the stack, can I forgo the aav? No different than having an entire bathroom on the same vent run right?

Since I don't think venting to the roof will be doable, could I do the following using an aav? Diagram is not to scale/measure re: offsets etc, but hopefully it gives a rough idea.

Wow! Thanks for the quick reply! re: venting. There is a vent to the roof ~ 1 ft from the current sanitary drain. Is that sufficient to prevent siphoning or does it need it's own vent? If not is it possible to use an automatic air admittance valve? in line with the ptrap before it hits the turn?

Hi all, long time lurker - first time poster, posting here in frustration after getting three wildly different assessments/estimates from local plumbers. Trying to decide if the best plan of action is to DIY as shown in the diagram below. SITREP: Newly purchased (old - 1956) house; we need to...