Handle position on the window not centered - defect?

I hoped for that too, but somehow I keep noticing it again and again.

Of course, you're currently completely fixated on it! You even created an extra thread in a construction forum, so you probably notice the handles in every house right now, that's just logical. But you don't even live there yet!! Give the handles a few weeks to breathe, then your hope will come true, promised. ;)

Breathing grips are breathing walls 2.0? ;)

If you hadn't addressed the topic of handles, then the manufacturer simply implemented their standard.

Standards are simply not discussed. Window size, properties, color appearance of the frames. Everything else is trustingly left to the general contractor.
You're also not debating the thickness of the rafters in detail.

But you won't notice that soon anymore.

Hm...
When I read the thread this afternoon, I thought "it's fine, nothing is standard," ... and meanwhile looked at my office windows, where the handles are installed similarly. However, the room is very tall, so are the windows, which fits here in the office.
At home, I don't have such windows. Maybe our bedroom window can be taken as a comparison, although we didn't pay attention at the time that the room would only be 235 cm high... accordingly, the window is not 126 cm high but only 116. (by the way, we don't see that anymore ;) )
Anyway: A parapet height of 100 cm seems quite high to me... we have a finished floor height of 85. So what do the 100 refer to in your case?
That would make a difference of 15 cm in height (our handles in the bedroom are at 115 cm height)

Ceiling height is 2.58 m on the ground floor and 2.62 m on the upper floor.
The parapet height is 1.00 m each and the window height for the affected windows is 1.26 m.

Rough construction measure? How tall are those things?

It is not a defect. And since your room dimensions are individual, there is no standard measure relating to the frame, only regarding the overall height.
By the way, window handles do not really affect the room, nor do they particularly stand out.

For me, the handles also look completely normal. In our old and also the new windows, the handles are not in the middle either, but further down. I think when your house is finished inside, you won’t see it anymore anyway. Chin up, there are really worse things in construction!

Chin up, there are really worse things on construction sites!

No, I would like to strongly disagree: this is not "just not bad," but ergonomically even better (except for the explicitly tall people over six foot three, who should also point out to the planners elsewhere in the house the need for deviations from the norm). The only reason for the rarity here is the overwhelming influence of Saint Perfectso, the patron saint of the zero-eight-fifteen.

Wow.... I must admit, I never would have dreamed that there would be different handle heights. Now I actually walked through the house to check it for the first time. And all my handles are centered. So I can understand the OP in that regard. Anything off-center would not be good for me either, if I’m being honest.