Main lines incorrectly installed

Is this a final assessment from him or was it spontaneously mentioned in ignorance of the actual extent?

The statement was made out of ignorance.

Have you already submitted a written complaint about the defect and requested its removal in writing? If your contractual partner is not reasonable, I would seek legal advice without further ado.

I issued a reminder by email on Saturday.

I hereby demand that you professionally remedy the mentioned defects and restore the contractually owed condition.

Very important: You are not responsible for proposing solutions. That is up to your contractual partner. He should say how he intends to achieve the target condition. And don’t accept bad compromises without further ado ...

I will not agree to compromises.

I simply cannot imagine that the site manager/craftsman really made a mistake. I mean, this is a professional company! They know what they're doing.

However, to me

The measurement error by the company that laid the main line results from the fact that our garage extends beyond the back of the house, namely the 110 cm from the measurement error.

reads as a plausible explanation of how the incredible could still have happened: reference point wrong - everything wrong :-(

dito Spannung steigt

So far no response. Only read receipts of the emails. I see that positively. The construction company is gathering facts and working on a solution.

Only read receipts for the emails. I see that positively.

Read receipts are good.

The construction company collects facts and is working on a solution.

Working on a solution and collecting facts would be my preferred order.

I reminded by email on Saturday.

I hereby request you to properly rectify the mentioned defects and to restore the contractually owed condition.

Hmm... can it get any more unfriendly? He first has to get an idea of the ACTUAL condition. Reminding by email should be avoided, I also don't know any craftsman who voluntarily checks his mailbox every day. A reminder must also be set with a deadline, otherwise you are giving them unlimited time now. Leaving that aside...

But with such a tone you can quickly spoil the relationship... You are just at the beginning of the construction... Are you building with a general contractor? Then they owe you the house that was planned... what happens in the meantime you sometimes have to endure. So if something happens on Friday afternoon and the construction manager wants to get an idea of the correctness of the work only next week, you cannot interfere, threaten or remind before he even had time to react. You can point out to him that something caught your attention... he should take a look at it... but coming straight out with reminders is completely exaggerated.

It is good that you are paying attention, but please give the construction manager or builder time to react at all.

However, to me it reads

as a plausible explanation of how the unbelievable could still have happened: wrong reference point - everything wrong :-(

I understand... That would be annoying.

Furthermore, it would be another proof that "specialist company" is not always equal to "specialist company." So it's no use always taking the "traditional" path.

(In relation to online purchases, MyHammer, etc... you just have to be lucky with the provider. Online just as in real life.)