Sanitary shell inspection: What should we pay attention to?

I am currently getting familiar with the subject. Tomorrow is the appointment with the plumber for the shell construction inspection. This is primarily not about the heating, but about the installation of the water connections. Nevertheless, I want to clarify the following points to have time to react:

1. Have the heating load calculation for our house shown/sent to me
2. Is the heating system mentioned in the contract (Stiebel Eltron 5 LWZ 5S) still the plan?
3. With what flow temperature is the heating designed?
4. How many heating circuits are planned and based on what criteria were they decided?
5. At what spacing are the loops of the underfloor heating installed?
6. At which points is the supply and exhaust air of the controlled residential ventilation planned?

From this, I have the following questions for my understanding to you:
regarding 1.) A heating load calculation is done individually for each house and must be handed over to me as the builder, right?
regarding 2.) Whether the heating system fits our house, I see by comparing the heating load and the output of the heat pump, correct?
regarding 3.) I have understood that anything below 30°C is okay/good, is that correct?
regarding 4.) Can one roughly say that one heating circuit should be installed per room? In the all-purpose room, I want to insist on three separate heating circuits. Can rooms be combined into one heating circuit?
regarding 5.) In rooms that should be "warm" (bathroom, all-purpose room, children's room) these should be closer together (less than 10 cm), and in "cold" rooms (utility room, master bedroom, dressing room) they can be farther apart. Is that correct? Are rooms like corridors somewhere in between?
regarding 6.) Here I want to make sure that the position is central in the room, without causing disturbance (e.g., directly at the sofa). Should we pay attention to anything else?

thanks for the tip. I found your thread. Could you please roughly tell me the page number with the installation plan?

I am currently getting up to speed. Tomorrow is the appointment with the plumber for the shell construction inspection. This is primarily not about the heating, but about the installation of the water connections. Nevertheless, I would like to clarify the following points to have time to respond:

1. Show/send the heating load calculation for our house
2. Will the heating system named in the contract (Stiebel Eltron 5 LWZ 5S) remain?
3. With what flow temperature is the heating planned?
4. How many heating circuits are planned and based on what criteria were they decided?
5. At what spacing are the loops of the underfloor heating installed?
6. At which points is the supply and exhaust air of the controlled residential ventilation planned?

From this, I have the following questions for you to understand:
Regarding 1.) A heating load calculation is done individually for each house and must be handed over to me as the builder, correct?
Regarding 2.) Whether the heating system fits our house, I see by comparing the heating load and the capacity of the heat pump, right?
Regarding 3.) I have understood that everything under 30°C is okay/good, is that correct?
Regarding 4.) Can it generally be said that one heating circuit should be installed per room? In the all-purpose room, I want to insist on three separate heating circuits. Can rooms be combined into one heating circuit?
Regarding 5.) In rooms that should be "warm" (bathroom, all-purpose room, children's room), the loops should be closer together (under 10cm), and in "cold" rooms (utility room, master bedroom, dressing room) they can be spaced further apart. Is that correct? Are rooms like hallways somewhere in between?
Regarding 6.) Here I want to ensure that the position is central in the room without being disturbing (e.g., directly at the sofa). Should we pay attention to anything else?

thanks for the tip. I found your thread. Could you please roughly tell me the page number with the installation plan?

Here you can view the installation plan:

https://www.hausbau-forum.de/threads/bau-eines-144-qm-bungalows-in-fichtenwalde-naehe-potsdam.39228/post-573671

Regarding 1.) A heating load calculation is carried out individually for each house and must be handed over to me as the client, right?

Even for each room. Depending on the desired room temperature. Standard is 20 degrees in living rooms and a bit more in the bathroom. Personally, I find that too low.
Handover? How are you building (property developer, general contractor, individual trades)? KfW efficiency level? What is stipulated in the contract? What must be handed over depends on that. So no clear answer to your question.

Regarding 2.) Whether the heating system fits our house, I see by comparing the heating load and the output of the heat pump, right?

Yep.

Regarding 3.) I understood that everything below 30°C is fine/good, is that correct?

30 degrees has basically established itself as the standard for good planning. Although 30 degrees is always calculated as the supply temperature for the lowest temperature in your area.

Regarding 4.) Can one roughly say that one heating circuit should be installed per room? In the all-purpose room, I want to insist on three separate heating circuits. Can rooms be combined into one heating circuit?

No, the number of heating circuits is determined by the heating load of the room. That can be one circuit for a small room and easily five for a large room.
Combining rooms is not a good idea and usually does not happen.

Regarding 5.) In rooms that should be "warm" (bathroom, all-purpose room, children's room) these [pipes] should be closer together (under 10 cm), and in "cold" rooms (utility room, parents' bedroom, dressing room) they can be spaced wider. Is that correct? Are rooms like hallways somewhere in between?

Not quite. The heating load (and the planned supply temperature) dictate how [the pipes] are laid. In the bathroom, it also depends on the available surfaces and whether, for example, a wall-mounted radiator is planned as a supplement.
By the way, there are no really cold rooms in a new building anymore.

Regarding 6.) Here I want to make sure that the position is central in the room without being disturbing (e.g., right at the sofa). Should we pay attention to anything else?

The positions result from the system planning. There are basic rules and dependencies on the building structure and the type of valves. A position centrally in the room everywhere would be extremely unusual. There are thousands of threads online about the "perfect" positions. In the end, regardless of where the valves are located, with a system running at low output you won't notice anything anyway.
That's what I would focus on. Better to choose a system that is somewhat larger and the corresponding piping. The air velocity in two pipes is lower (at the same volume) than when a small system has to push hard to deliver its output through just one pipe. You’ll notice the difference.

Thank you for your answers. :)

Even for each room. Depending on the desired room temperature. Standard is 20 degrees in the living areas and a bit more in the bathroom. I personally find that too low.
Handover? How are you building (developer, general contractor, individual trades)? KfW efficiency level? What is regulated in the contract. What must be handed over depends on that. So no clear answer to your question.

We are building with a regional general contractor. It is not listed in the construction service description. It only mentions something about ventilation planning. I will simply bring it up tomorrow.

I am reporting back with an experience report and look forward to your feedback: The structural shell inspection was very pleasant. I had the feeling that the managing director of the sanitary company took time at the important points and also pointed out advantages and disadvantages of different options independently of his possible workload. When it came to the heat pump, he said that it fits our house/heating load and is definitely not oversized. He will send me the heating load calculation. Based on this, the pipe spacing is planned between 15 and 20 cm and the flow temperature at 35°C. I then expressed my wish to reduce the pipe spacing in order to lower the flow temperature. In response, he said that he could basically understand this, but whether it makes sense he still has to calculate (or have it calculated) again, will also get back to me with possible additional costs (more pipes and working time), and then wants to discuss both variants with me again. His reasoning was that I cannot assume that closer spacing is always better, but that his first calculation fits our house very well. I now ask the following: 1. What impression do you get from the experience report? 2. Do I have a flaw in my logic chain: "15-20 cm pipe spacing and 35°C flow temperature are basically too much because closer spacing and lower flow temperature are better," or can the argument "15-20 cm fits our house best" already be correct? 3. What have I not considered and what else needs to be clarified? Thank you. :)

3. What have I not considered and what else needs to be clarified?

Have you set the desired room temperatures?