Spontaneous improvements to underfloor heating design

So, thanks a lot for the opinions. Then I'll see what can be done.

One could try to adjust the circuits in rooms 1 and 2.
So the living room circuit to about 85 meters and then combine AZ and part of the living room to about 85 meters.
This would make the circuit lengths more even.

Is it really that simple? Doesn't the door need to be somehow cut out?

If feasible, I would have it placed under the tub.

Will do! (trying)

I have one more question for understanding. Why are the two corner children's rooms designed so differently in terms of lengths and flows (67kg/h and 100kg/h)?

I understand that the middle room has less heating load. But K1 and K3 have comparable exterior wall lengths and sizes.
Orientation southwest and southeast.

Thanks in advance.

I suspect that Child 1 has a better ratio between exterior wall length and room volume (more compact). This is then balanced out again in the more difficult furnishing. However, I would not have thought that it makes such a big difference.

You can no longer adjust the AZ individually since it also affects the WZ. From the installation perspective, it should work since you are not creating any additional circuits. However, it will not have a significant impact as there are other circuits with longer lengths. If the company has problems/sees issues with that, I would not insist.

Any other tips?

The shower! Is it a shower tray or walk-in? We have pipes under our walk-in one and do not need an additional radiator.

The shower! Is that a shower tray or walk-in? Under our walk-in we also have pipes and do not need an additional radiator.

Shower tray in the screed, so unfortunately that is out of the question.

In the relatively large hallway on the ground floor, no underfloor heating is planned?! Why?