Bathtub in front of window, railing too low, contractor is obstructing

As written - window hinge on the other side and with the window open, you can neither climb onto the bathtub nor fall out.

As far as I understand, the question of whether the parapet is too low according to Hessian building law does not depend on which side the window hinge is on, but I am happy to be corrected.

Apart from that: Would this solution really be cheaper (and thus more acceptable for the general contractor) than installing a parapet? Unscrewing and screwing it on the other side probably isn’t enough, or are the "mushroom heads" mounted in the frame so that they are in the correct position regardless of the window hinge? Also, the holes from the left hinge are still in the frame, can you see them when the window is closed?

Additionally: Since the bathtub isn’t installed yet, I can’t judge exactly, but according to the plan, the open window sash would probably be above the middle of the bathtub rather than the edge. So I don’t think that would really help.

How does your expert charge?

I don’t quite understand the question. He spent about 15 minutes on this issue, he’s not going to get rich from that...

As far as I understand, the question of whether the parapet is too low according to Hessian building law does not depend on which side the window rebate is on, but I am happy to be proven wrong.

No, you are probably right .. but if you are going to change something anyway, you should also consider the ergonomic aspects. I would have considered the window rebate nonsensical from the start ;).

if the planning/execution does not comply with building regulations) is moved to the "Sanitary" area, I do not understand,

Maybe because they want to give readers the hint that you plan bathrooms, not just draw them ;)

When I look at the letter from the Ministry of Economic Affairs

Hessian building regulations too low

It’s just about principle for you, isn’t it? You’re not interested in a solution! … Has the general contractor otherwise made so much mess that you want to counter him?

If the window stop is changed, no one can fall/ climb out of the window from the shelf.

I understand the part of your problem that the house should comply with the regulations (tilt windows). I don’t understand the part about the children.
The windows are lockable and presumably locked. If the key is kept child-safe, they cannot open the windows. You won’t be using the sauna shortly before children visit. You have ventilation. No odor nuisance, no steam clouds.

Channels and cable ducts, for example, often run along the exterior walls in old office buildings. Often used as a step in front of windows or balcony doors. This is what is meant, an "installation" that people normally use without thinking to stand on – and then there is a risk of falling.

But: Which normally thinking adult _climbs onto a bathtub_?!

As unrealistic as this may sometimes seem in Germany, the building regulations were not written by crazy people and not just as harassment. I think you are worrying unnecessarily.

But feel free to simply ask the building authority! It costs nothing, and if your concern really is a violation, the authority can tell you if everything is fine and you don’t even have to deal with the general contractor.

When all the dice have fallen, I would simply convert the window to [Nurkipp].