Experiences when construction workers have no knowledge of German

The sentence structure also comes from Google Translate or what?

Otherwise, you build a house in Poland exactly like in Germany, for everything else there is the warranty and lawyers.

It was important to us that we have ONLY craftsmen from the region and no cheap labor from Poland, etc. We communicated that directly and then had exclusively those. Small companies (one-man show roofer, for example) up to larger companies. All very nice people who all spoke German. Very pleasant... and they were usually well paid (at least those whose wages I talked about).

There are property owners who speak with the head of the craftsmen.

There are general contractors who speak with the German-speaking heads or managing directors of the subcontractor companies.

Why should the headquarters of the subcontractor company be located abroad?

I believe if you think more carefully, you will understand that one has little to do with the other.

Many installers at Audi or VW speak broken German. DS will not stop you from ordering a VW.
Basically, the site manager of the general contractor is your contact person, not the craftsmen. If you think it is necessary at A or B to exchange with them, then you must try to make something plausible to them.
At Danwood, a Polish company, it is common for the property owners to clearly explain their ideas and special requests, which are then executed by the Poles. Take a look at Danwood’s construction diaries – they take it with humor and appreciate that the craftsmen carry out special requests for relatively little money. They don’t have to.
Regarding German craftsmen: there are also some who raise their hands and refer to their boss. They don’t want to, even though or precisely because they understand everything, including their rights.