Sink vent how far from toilet vent

DannyB

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Location
South Louisiana
I am adding a Small Bath and Kitchen to a Studio
South Louisiana
drains will be under concrete slab
My builder (not a plumber) but will do the plumbing
said 1 vent is enough for this
I think Not
I would think a vent next to toilet and one in wall between kit sink and washing machine
But I am not a plumber either
I need advice
Thank you in advance

yes the kitchen and bath are both only 8' X 9'


plumbing drain.jpg
 
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