Exactly, I remember very clearly and I did not understand you back then. I then asked the architect. She said qiesovieles other wrong. I assumed it would only be one height but not like a board in front of it.
Is there really nothing that can be done about it anymore?
You were pointed out twice at that time,
approx. 15 cm access step to the balcony results from the parapet height, which is given from the raw floor. 25 cm are specified, minus approx. 15 cm floor construction plus approx. 5 cm threshold of a normal window = 15 cm step.
The plan shows parapet height 25. What does the parapet height refer to? Raw building measurement or top of finished floor? If top of finished floor, then even a 25 cm step. This comes from the fact that the floor construction of a roof terrace is higher than the floor construction inside the house.
and the question to the architect was correspondingly clearly posed "what does this parapet height refer to" (possibly supplemented by "and is there anything else added"), so the answer "wrong" would not have been an option. Actually, I should have linked you back then to the comparable situation of ;-)
For that, I am linking you now and in several last year's posts mainly in threads by you will also find the topic about the term "Flachschwelle" explained in the forum search.
how is it normally done today?
Exactly like that, it is absolutely current, and with the normal threshold also the most common variant. However, I consider the variant with flat threshold to be norm-compliant permissible (personal opinion without guarantee!).