Assessment of Additional Construction Costs - Have I considered everything?

Yes, that's correct. I have left €1000 each time to secure the connection. That is a rough estimate.

Check the page of the future suppliers as the exact prices are listed there. I consider 1000 euros to be too little.

For the fiber optic connection, the manufacturer charges approximately €250 for the connection inside the house. (750€ buffer)
The electricity connection costs €750 (250€ buffer)
The water connection is brought into the house by the installer (that's what I was told), so I cannot yet estimate which costs will arise for me.
The same applies to the connection of the sewage channels.

Fortunately, I have redistributed the deducted buffer in the connections to other items.

Possibly still tightness test 300€?
Excavation acceptance 500€?

I would get more detailed information on that. For us, it is the same as for you, meaning that the lines up to the property and the inspection shafts were already included in the property price.

However, the following still apply:
- €11,000 for electricity, water, district heating, and fiber optics to the [Stadtwerke]
- €5,000 for wastewater to the civil engineer for connection of the house with inspection shafts.

So a total of €16,000, which should not be forgotten...

Hello, When I read the prices for the house connection costs here, I have some slight doubts about the calculation of our developer. The developer calculates only 6000 euros for everything for the house connections, that is, only the lines from the boundary to the house. This is based on experience from other houses in the same construction area.