Exactly. The BU is possibly responsible for sewage and rainwater drainage. Fresh water, gas, electricity, telephone are billed by the respective providers. Here gas 750,-, electricity 1200,-, water around 2000, telephone 800,-. Often the decisive factor is how many meters they have to dig. If you plan cleverly and they manage with 5-7m, it can be very cheap. If you plan poorly and they have to dig 15m, you pay. Karsten
That already reassures me. If I see where the fresh water connection comes out at the property boundary, it should not be more than 7m for electricity, telephone and fresh water (without gas since there is an air-water heat pump). Then I hope the estimated 6.5k€ is about right.