House construction with TuC and changes - Your opinion?

Here is some builder feedback from those who have installed the Lunos e2:

https://www.hausbau-forum.de/threads/lunos-e-Erfahrungen-zu-dez-Lüftung-gesucht.10747/page-10#post-135165

I have also often read such statements, so I think there will only be something in the bathroom.

May I ask how the sampling went? What was the sampling flat rate according to the construction service description and how much extra do desired changes cost?

I'm out, we're not there yet. On Friday there is a notary appointment for the [Grundstück] and afterwards a meeting at [TuC] regarding the [Grundriss] etc.

May I ask how the sampling went? What was the sampling flat rate according to the construction service description, and how are the desired changes priced?

What do you mean by sampling flat rate? I found the surcharges okay, partly even surprisingly low (for example, the upgrade from a small guest bathroom sink to a regular-sized sink only cost €3.50 or something around that). It went like this: for some things (e.g., interior doors, bathroom) we went directly to the partners from whom the items came and sampled there, and for other things (window sills, etc.) the sampling was done in the model home of our franchisee with sample cards/pieces...