Sewer channel at the property boundary

The handover shaft must be accessible, shortly before the house entrance there must also be an accessible one according to DIN (the architect said), in between I have exactly what you are referring to (40 cm diameter). That is how the architect planned it...

The transfer shaft is located 2m behind the gate, from there everything is laid with 125/100 pipes with simple revision to/into the house

Why does the architect then make a second 1 m shaft?

Just ask him

He says, it must be according to DIN

Then it is apparently the case, we only have the transfer shaft