Is the wastewater ventilation in the garden shed sufficient?

Hello everyone,

our small garden house (30 square meters) is finally going to get sewage pipes for the kitchen (sink) and bathroom (sink, shower, toilet).
Is one vent pipe through the roof (near the kitchen) sufficient for the sewage pipes (see sketch), or does a vent also need to be planned in the bathroom area?

Thank you very much in advance!

Andreas

I'm not a professional, but I think a second ventilation makes sense. In the case of a garden shed, however, I would also have no hesitation in providing an internal ventilation.

Thank you very much for the assessment, we had also already thought about an internal ventilation, apparently something like that even works, for example, just under the sink. What would now be interesting is: what is probably the best place or where does it not make any sense at all? ...