Underfloor heating distance, missing spot, and bathtub

At our place, a narrower gap was chosen for the edges of the rooms and in the bathroom. In winter, we have a supply temperature of max 28 degrees with room temperatures then from 22-25 degrees. Yes, if the bathtub stands on the concrete, it is easier to get in. We have that too. Generally, there is no underfloor heating beneath the tub.

The bathroom could be narrower, it should be under 10cm, max. 10cm. If you want significantly higher temperatures in the bathroom, e.g. 24 degrees, 10cm is usually not narrow enough. Otherwise, you can tell that there is some intention behind it. Hallways are less narrow (with some bare spots, but in the hallway that doesn’t really matter), kitchen units are spared. It’s okay.
Regarding the tub on the raw concrete, send the picture after the insulation cutout to the plumber to check if the tub’s support feet fit next to the rough installation.
I’m generally a fan of the tub on screed anyway. Everything has its pros and cons. “Modern” is the tub on the raw floor.

All right, thanks for your impressions! I had already written to the plumber, also with pictures of the cutout etc! I will also try to reach him by phone tomorrow morning.

Overall, it is very neatly installed. The door transitions are also protected, and it has been laid into the door reveals as well.

I agree. Only the turns on the upper floor look quite imaginative; a little ribbon could have been added there.

The plumber reported right away at 6:00 and sent someone to improve the bathroom. He also said that the screed should be left out in the shower, so the tiler can do the slope better. Great guy!

He also said that the screed should be omitted in the shower

Yes, it is also very good that the shower was covered. I would, in your place, if not already existing, now install a power connection for an infrared heater/mirror or for an electric towel radiator - for occasional additional heating when needed. Once the tiles are on, you won't do it anymore. As long as the heat pump is operated efficiently, you will probably get the bathroom as warm as the other living rooms without additional heating surfaces (ceiling/wall); some people find that too cold.