Bathroom Sink Venting Question

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Ontario, Canada
Hello, I'm putting in a bathroom sink drain in Canada, Ontario.

We had a plumber come in who told us there was no vent for this drain and it would cost a lot to install. We contacted another plumber, who said all we needed to do was install an AAV.

I'm a little confused because it looks like there is a vent connected.

drain basement.jpg

The washing machine also connects to this vent and then travels to the kitchen (about a 10ft run)


I have two questions. Is an AAV required if there's already a connection to the vent and would a ptrap be required in the sink cabinet if there's already one below it in the basement?

Any help is greatly appreciated!
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