Construction of an approximately 190 sqm city villa in Hessen (Wetteraukreis)

Where is the price for the shell house? And you would have to tender and commission the companies for the interior work?

The shell house costs about 320,000 euros. The first provider has partner companies for the interior work, which he supervises himself. The offers are just coming in, so far they correspond with minor deviations. About 160,000 euros are budgeted for that. Tiling work is included, other floors and walls would be an additional 30,000 euros. So I wouldn't have to tender anything myself. Unfortunately, I don't know the validity of the currently obtained offers. That could possibly lead to additional costs?

I am unsure what I am allowed to post here due to the forum rules and what one is allowed to upload from the provider because of copyright.

Your photos, floor plans from GUs, naming of companies, GUs and BUs, almost everything is allowed. No disparagement, defamation, or advertising. And no links.

Your photos, floor plans from GUs, naming of companies, GUs and BUs, almost everything is allowed.
No disparagement, defamation or advertising. And no links.

Thank you!
The regional provider is Opti-Haus. They build about 10-15 houses per year, probably no one here knows them. The Liapor walls come from FC Nüdling, I really like that supplier.
The construction service description from Opti-Haus contains very few points to be done by the builder, but most of the usual items have to be taken on as well. I think you get a rather good product for the prices asked. The sales manager is transparent about the company history, so I am informed.

The second offer comes from Okal Haus. We took the Stadtvilla 16 as a basis and changed a few things. Until the beginning of July there was a €22,000 discount (due to canceled KFW funding) on the houses, including this Stadtvilla.
I have read and heard some positive things about Okal Haus, but there are also negative reports. Considering that they probably build about 1000 houses per year, I don’t find the amount of complaints particularly high. Nevertheless, I would be glad if you can report on the quality of the execution, if possible.
The construction service description from Okal Haus has many pages listing the tasks to be taken over by the builder, but from my point of view there are no huge hidden costs included. The probably biggest cost drivers (e.g. hillside location or difficult to quarry property) do not apply in my case.

Maybe this helps in assessing the situation.
Thank you!

My only objection is: I don't believe in air-to-air heating systems. Otherwise, if prefabricated houses are your thing, go for it. It also depends a bit on preferences and the area.

My only objection is: I don't think much of air-to-air heating systems. Otherwise, if prefab houses are your thing, go for it. It also always depends a bit on preferences and the region.

We switched to the indoor air-to-water heat pump from Viessmann. Can you approve it? :)

We have switched to the internal air-water heat pump from Viessmann. Can you approve it? :)

No, I am not familiar with Okal house. However, as long as it heats water for underfloor heating, it should be okay.