Additional construction costs ... but which ones?

That is exactly where my list comes from, from the posts made there. Since these are always individual and different, I now wanted to verify them precisely for my construction project. Just as I did with the electricity connection or the gas with the supplier. Since the municipal utilities (water supplier) do not feel responsible for this, my question is where can I request / develop verified values?

However, the whole thing falls under the item earthworks, depending on the offer!

Ok - I am obviously not familiar with the topic at all - I only understand about half of it.

Be merciful with me, I will try to list what I have understood so far.

1. I need a fresh water supply. The connection is at the property boundary, and I have estimated the installation including the connection into the house at €2000. This will be carried out by an independent installer, therefore no verification before requesting a quote.

2. Wastewater disposal. A shaft needs to be constructed for this - I do not know who will do it or what it costs. Cost estimate from contributions €4300.
Question: Is the shaft optional? What is it for? Wouldn't a "simple" connection to the sewer be sufficient here?

3. Rainwater. A cistern can be built to reuse the water. But what do I have to do here? Theoretically, can I do nothing and just let it seep away?

Thanks to you all.

1. I need a fresh water supply. The connection is located at the property boundary; I estimated the installation including the connection into the house at €2000. This will be carried out by an independent installer, so no verification before requesting offers.

Do you know your basic supplier? My basic supplier has the exact connection costs broken down on their website.

2. Wastewater disposal. A shaft needs to be constructed for this – I don’t know who does this or what it costs. Cost estimate from posts is €4300. Question: Is the shaft optional? What is its purpose? Isn’t a "simple" connection to the sewer sufficient here?

I only know it with a shaft. Usually, there are several drain pipes that are then bundled here.

3. Rainwater. You can build a cistern to reuse the water. But what do I have to do here? Can I theoretically do nothing at all and just let it infiltrate? Thanks to you all.

What does your soil survey say regarding infiltration? Our municipality has very clear rules about what should happen with rainwater.

1. I need a fresh water supply. The connection is at the property boundary; I estimated the installation including the connection into the house at €2000. This will be carried out by a freelance installer, so no verification before requesting offers.

2. Wastewater disposal. A shaft needs to be constructed for this – I don’t know who will do it or what it will cost. Cost estimate from posts: €4,300.
Question: Is the shaft optional? What is it for? Wouldn't a "simple" connection to the sewer be enough here?

3. Rainwater. You can build a cistern for reusing the water. But what do I have to do here? Theoretically, can I also do nothing and just let it seep away?

Thanks to you all.

The fresh water supply was installed by the municipal utilities here.
It cost us €1910, from the property boundary up to the house, 15 meters included.

Wastewater had to be applied for and contracted to a specialist company. That cost another €2821. The building permit specified what was needed. Shafts are for inspection in case of clogs.
My specialist company said it’s best to build a shaft at every straight section to make it easier if problems arise.
I would recommend asking a civil engineering company in the region as an example.

You can do a lot with rainwater... The cheapest thing I found are soakaway tunnels. Doing nothing I would advise against, since so much water comes from the downpipes, it’s not that easy, you’d flood. Maybe it could be connected to the sewer?

Do you know your basic supplier? My basic supplier has broken down the exact connection costs on their website.

Yes, I know it, but they refer to the fact that this must be done by an independent technician. The supplier only provides up to the property boundary.

But thanks for your explanations, I think I understand the topic a bit better. The prices you mentioned also roughly match my planning, so I can probably wait calmly for the actual services incurred and then commission the right ones with the help of the site manager.