Is summer heat protection in new buildings *mandatory*?

In addition, roller shutters create a much more pleasant sense of well-being. If necessary, they protect against prying eyes, and the kids will surely be happy when they have to go to bed in the summer months and the room is nice and dark.

You have protection and maybe a better feeling while you are on vacation, right?

XY should be standard. AB is 1970, leave that in new buildings.

Thank you to the three four of you for your answers and recommendations! We currently live as briefly described above in a new building, first occupancy 10/2014, only not KfW 55 and without controlled residential ventilation but energy saving ordinance minimum standard, and we have no major problems with the heat. At least if my wife keeps the bedroom windows closed during the day, which unfortunately is not always the case
The children have also survived so far without serious difficulties, in summer it just gets really hot on a few days, that’s how it is. I don’t want blinds because I know from my parents’ house the manually operated blinds, where either the belt now looks terrible (torn) or the blinds eventually partially get stuck or break in other ways. I don’t want to have even more devices to maintain in/on the house – and especially with the internal plastered or wallpapered roller shutter boxes it will be a big "fun"/huge effort in case of a defect in the belt/motor/radio receiver/roller shutter or elsewhere – and that with 19 or at least 14 windows… When I think of the costs for roller shutters and add them up for 19 windows in inexpensive motorized version, I come to at least €3,000 extra – in reality it will probably be significantly more. I don’t even dare think about KNX and similar gimmicks, I once roughly looked at the costs, I almost felt sick, because you quickly end up in the five-digit range. I am an IT specialist and currently think that my network sockets (and the wiring converging in the utility room) in the rooms are fully sufficient. The only thing I have considered is a system that notifies you when a window is open (electronic window contact?), but I couldn’t find a reliable price and expect exorbitant costs ;-( I would like to avoid retrofitting shutters by drilling afterwards, I am afraid of damaging the ETICS, and would possibly have the attachments for shutters provided already during the construction phase. However, my wife could accept shutters, they can also – I fear in red – be a design element. I will take a closer look at venetian blinds, maybe they are significantly cheaper… But back to the actual question: Is sun protection a legal must, meaning can we somehow be held liable if we omit it or even forced to retrofit it? Or do we even violate building regulations or similar?