Cost of cable connection Cable Germany

Hello forum,

I registered here because we want to build a prefabricated house in the near future.
In advance, I of course want to have as much clarified as possible, especially the technology.

The Telekom connection is clear, 384€ flat rate, regardless of whether you use it or not.

I also had an offer made by Kabel Deutschland for setting up a transfer point.
The whole thing should include as much DIY work as possible. Now I have received an offer of 199€.
The service: laying the cable through the channel I prepared on the property into the house and connecting the transfer point.

But what I wonder is: How does the cable get to my building site if it is not there yet and who bears the costs?
I guess KD does, right?
Because in the letter it says:
The house feed includes the costs for civil engineering and installation work including material and for the excavation permit from the road maintenance authority of the municipality. ...

So I think the price is included, right?

I have already called the hotline once, but I do not always trust them and prefer to get more solid information.

Also, I was told on the phone that I should sign up now because next year the costs would 5 fold! I can hardly believe that.

And the question that still arises for me: does the price only apply if I also use the connection?

Thanks to you!

Does no one here have any experience?

Thank you.

Then just ask Kabel Deutschland! With Unitymedia, the price at least depends on whether you commit to the provider with a contract. Price difference approx. EUR 200.