Development costs / House connection costs

An additional development cost payment (construction contributions for the sewer) was added to our developed plot; a base price had already been paid based on the plot size, the rest was determined based on the floor areas. One should possibly clarify whether such an additional payment is necessary.

It will be the same for us. If the cellar counts towards the floor area, it will be another 2k€, otherwise only 400€.

It will be the case with us as well. If the basement counts towards the floor area, then it's another 2k€, otherwise only 400€

Phew, it's been a while, but I believe we had to pay for the basement, ground floor, and first floor. It should have been a total of around 2,500 +/- a few hundred euros. Oh yes, we also had to pay for the terrace/balcony, as long as they were recessed from the house.

Is there anywhere to see how high the costs here for sewage, electricity, ... would be?

You can ask your municipal suppliers about that. They have the information down to the cent. They also know immediately what you mean when you say new construction.

The development costs themselves are quite a large item in the additional costs. With a fully developed property, it should be significantly lower here, right!?

No, why?
Development costs are AT the property. Others write IN, IN FRONT OF, ON... doesn't matter. They are at the property (even if it is on the other side of the street).
Connection costs are the costs concerning the connection and depend, among other things, on how far your house is built from the property boundary and what you actually need. It may be that you don't want Telekom, don't need gas...
At least that's your problem. After all, you are the one building.

Each utility provider handles this individually. The only way is to inquire or research with the providers responsible for you. Some calculate with flat rates, others pass on their own costs, and sometimes it is regulated in statutes.

For starters, you can get the pipeline plans, then you can already estimate the routes and clarify whether the lines are in the street, on the sidewalk, or even on the property. That makes a big difference.

Telekom generally costs €800.

Otherwise, many calculate with €10,000 for everything, with gas usually 2-3 thousand more. But that depends a lot on the property. We ourselves have calculated €25,000 without gas, which is partly due to the location of the house.

What do you mean by the location of the house? Back property, i.e., the length of the area to be developed is longer?!

What do you mean by the location of the house? Rear property, i.e. the length of the area to be developed is longer?!

The house connection includes the actual house station or the entry into the house (multi-utility entry; in the case of local/district heating connection, a storage tank may also be included) and the house connection line.
The cost of the house station does not depend on the location of the building. However, the costs of the house connection line very much do. The farther the house connection point is from the property boundary / the extended line (i.e. the connection point to the public supply), the longer the laid line is and, what particularly matters, the greater the effort for excavation work.
Common practice is that your utility provider offers the house connection including 10m (can vary greatly) of house connection line at a fixed price, provided it is on unsealed ground. Each additional meter is then specified with a price x. Sometimes it is also possible to order without excavation work if you can carry this out yourself according to specifications, or other variations.
All of this should be described quite transparently by your responsible utility provider. If you roughly know the line length, then you can roughly estimate the costs.

Simply ask directly, then you will be told quite precisely.