Total cost of sewage connection

Hello everyone,

slowly the construction work of my single-family house has begun and so far I am very satisfied with the progress. The only issue that still concerns me and for which I do not receive reliable / too many different statements are the costs for the sewage connection.

The initial situation is shown in the attached picture.

Is the following cost calculation correct?

a) Laying the pipes by the drainage companies up to the property - costs according to staff approx. 3,500€
b) Laying the sewage pipe from the house to the property boundary by a civil engineer - at a length of approx. 30.25m and meter costs of approx. 45€ = 1,400€
c) Creating an inspection shaft, which is mandatory per property, and creating another inspection shaft, which is mandatory due to the bend, by the civil engineer - 2x 2,500€ = 5,000€

Thus, I come to total costs of approx. 9,900€. Have I forgotten any costs? Do the values I assumed differ significantly from the experiences here in the forum?

Thank you very much in advance!

Best regards,
Martin

to a) are all costs included there? Also a possible construction cost subsidy that relates to the length of the street frontage or the size of the property? We have something like that here in Berlin.

to b) I have no idea about the prices, but that seems very cheap to me including all earthworks.

Does the pipeline have to be tested for tightness? I would have the pipe installed by the company that also did the base pipes and penetrations under or in the floor slab. Then there is only one person responsible.

The costs for our "trench including pipes", approx. 35 m, amount to just under €8,500 without the house connection. House connection, municipality: €3,000 Inspection shafts, 2: €4,000 Backflow valves: €600 Additional costs: Water connection: €2,000 Electricity: €1,800 Gas: €1,600 As well as Telekom: the invoice for the self-laid cable and the house connection is still outstanding. I hope the breakdown helps to roughly estimate the costs. However, we are building in Koblenz.

a) Laying of the pipes by the drainage company up to the property - costs according to employee approx. €3,500 b) Laying the wastewater pipe from the house to the property boundary by an excavator - at a length of approx. 30.25m and meter costs of approx. €45 = €1,400 c) Construction of an inspection shaft, which is mandatory per property, and construction of another inspection shaft, which is mandatory due to the bend, by the excavator - 2x €2,500 = €5,000

For the inspection shafts (wastewater and rainwater) we paid 3000. Some earthworks approx. 500. Leak test 200.

What about the costs for rainwater from the house to the cistern? Do you have that?