Prefabricated basement - self-contracting instead of general contractor

We plan to subcontract the basement ourselves and would like to prepare for the further planning with the basement builder. Who already has experience with this? What information does the basement builder request? Did you particularly do the electrical planning yourselves and pass it on to the basement builder or involve your electrician? Is the position of the sockets, heating points, network sockets, and switches sufficient for the basement builder?

Additionally, I wonder why our general contractor by default boards the finished basement with Rigitherm (sandwich composite panel made of Rigips plus insulation). At least the living rooms in the basement are equipped this way. The hallways are only boarded with Rigips. The electrical installation under the panels then disappears in the "concrete". Although it saves drilling and chasing in concrete and is relatively flexible for a long time, it otherwise does not seem very common to me. At least I don’t find much about it on the internet. Do you really need such boarding in a KFW40+ house with 20cm perimeter insulation, and how do your concrete basements look?

You will have to get the electrician on board anyway for the grounding of the house. The proper execution must be documented, and the electrician must confirm this to the power supplier during registration.

If you subcontract the basement yourself, you have to coordinate all interfaces yourself. Who handles structural engineering? Heating? Ventilation? Water? Wastewater?

OK, thanks. Ringwerder is done by the civil engineer. I don’t know about the documentation yet. Good point. The structural engineering is done by the basement builder. Heating, ventilation, water sewage, electrical work is done by the general contractor.

The earth ring is done by the civil engineer. I don’t know about the documentation yet.

The documentation must be done together with the earth ring; without documentation, the thing is practically worthless, and you won’t have access to what the documentation must show for much longer. I refer to my post

As always, well written even in the link, but somewhat negative, although I always appreciate your opinion very much! With this logic, however, almost every own effort would be doomed. DIY ring trench collector, and already you freeze in winter and any guarantee on heating, underfloor heating, and sanitary area is gone... The basement planning is done by the general contractor, the basement construction by the basement builders. If the plans were wrong, the general contractor is responsible; if the basement was poorly done, the basement builders are responsible. The general contractor also inspects the basement before erecting the house and thus serves as an additional inspection point. The builder only acts additionally as an intermediary. Of course, you have to be a little more careful and should only rely on rather prominent, trustworthy representatives of their profession. Otherwise, apart from a possible timing coordination problem, I see the problem as manageable. For savings of 10,000€ on the basement, as well as hopefully another almost 10,000€ by omitting unnecessary cladding of basement walls, the desired goal is indeed desirable. What does the forum think about basement wall claddings in already well externally insulated residential basements (KFW40)?

As always, also in the link, well written but somewhat negative, even though I always highly appreciate your opinion! With this logic, however, practically every personal contribution would be doomed to failure.

References to potential blame-shifting points and the warning "the builder should be vigilant and not put the warranty shoe on oneself" are not synonymous with the gloomy outlook that one is surrounded exclusively by idiots and crooks on the construction site. There are indeed some streets where not a single "Fleischerhaus" stands.