Plumb island sink and AAV code for Ajax
 

I've been reading a lot about how to plumb an island sink (I'm keeping my existing sink and added a prep sink in a new island), and seen the pictures with the loop vent....

I've called 2 plumbers to come quote the job, and with the open basement, both said they would tap into my 3" stack and run the pipes within my joists so that I can finish my ceiling cleanly (finishing basement next).

One was a smaller, local plumber and he quoted me $500 to rough in the drain and pipes. He said the 3" stack should be "vented enough" that he wouldn't need to run another vent up my wall and have a normal sink connection in the cabinet.

The other plumber was from a larger company, and after taking a look at the job came back the next day after he consulted an inspector they work with.

His first quote was not up to code (still $500), and he said he would run a double p-trap under the sink before going down into the basement and over to the 3" stack. He said he would do this in his own house.

To do this up to code, and under permits, he would still run into the 3" stack, but he would also branch off of that and run a pipe up my wall from the basement and out the side of the house (between houses which is dead space). The price for this was $1000. He told me the inspector said AAVs are not allowed in my municipality.

A few questions:

1. Anyone know for certain that an AAV is not allowed in Ajax, Ontario? I do a lot of travel for work, so trying to get to my planning department and access to an inspector is a PITA.
2. What is this "book" they refer to? Is there a standard price book that they quote jobs from?
3. I'm thinking I'd want to do this to code becase I plan on selling the house in several years and don't want to have to deal with an inspector telling me to fix something when I've already finished the basement. Is the suggestion for work done to code accurate with what you all would do?

I'm not too worried about spending the money (piece of mind for an extra $500), but I really don't want to spend on a larger job than it has to be (and cutting into my exterior wall).

Thanks for all the advice!

The other option that I see other than cutting a hole in the side of your house for the vent is to run it to a closet somewhere and run it up the corner of a closet. Of course this won't work well if your house is bigger than 2 stories.

I don't know anything about the canadian plumbing code, which is probably the "book" they were referring to.

:huh:

1. I can't tell you specifically for Ajax, but I doubt very much that they would disallow the AAV for an island sink set-up. In the BC codes it's to be used in special circumstances only, at the discretion of the AHJ (Authority Having Jurisdiction, aka - local inspectors). Some jurisdictions around here adhere to the strict rule, others are more lenient. As for getting an answer from the local inspectors, get someone you can trust, who has no financial interest in the outcome to find out for you if AAVs are allowed in this circumstance.
2. There's no 'book' that I'm aware of for pricing jobs, like the mechanics have. Just the code book. Each job is unique and therefore time limits cannot be set in stone (or to paper).
3. I'd run a new vent on the inside & through the roof like Alan suggested, not exit through the side of the house.