[diy001]

Any plumber/expert can tell me if this layout is good or not?

 

[TheEplumber]

It is fine according to the code I work with. Its redundant to have 2 vents on the basement fixture though. Are there other fixtures you are not showing?

 

[diy001]

It is fine according to the code I work with. Its redundant to have 2 vents on the basement fixture though. Are there other fixtures you are not showing?

Verything related is there.

Are you saying I can remove one vent for the sink and connect the red line above the sink drain? Like this drawing?

 

[TheEplumber]

Verything related is there.

Are you saying I can remove one vent for the sink and connect the red line above the sink drain? Like this drawing?

yes, but looking closer at your drawing, the first floor sink is draining into a vent or is it mislabeled. If thats the case then I cannot recommend your new vent location. In my neck of the the woods, that is an illegal wet vet. I'm not clear on whats happening on the left side of your drawing. At any rate, it will function as you show it.

 

[diy001]

yes, but looking closer at your drawing, the first floor sink is draining into a vent or is it mislabeled. If thats the case then I cannot recommend your new vent location. In my neck of the the woods, that is an illegal wet vet. I'm not clear on whats happening on the left side of your drawing. At any rate, it will function as you show it.

Left side has another main stack for 1st floor toilet AND counter sink. that vent is a dry vent, vent only. Like this new drawing:

 

[TheEplumber]

you're good to go.
good luck