Distance between barrier-free balcony threshold and floor

If you want approximate thresholdlessness, you clearly leave the area of DIN tolerances for all components to be joined together and step onto the parquet of the absolutely necessary first detailed drawing by the architect and second the clear determination of which trade must take which as the master actual dimension.

That can be the door fitter or the floor layer. But if each of them works away as in the standard case, the whole thing simply does not align perfectly, unless chance and guardian spirits cooperate.

Wouldn't the covering have allowed the floor layer to "ram up"? – then the door fitter would have had to be the successor.

A single purchased special part does not make fitting any more than a swallow makes a summer. Architects know this, general contractors’ planners often do not take it into account.

The floor came after the door and as chance would have it, the floor of the first door (10 parties) was almost flush.

Of course, a zero deviation is also within tolerance

Are you the only one of the ten parties who specified these special thresholds?

Ten parties also sounds like a developer – what is your position vis-à-vis the floor layer?

Is there any news on this? I am in a similar situation. However, in my case, the gap is almost 2 cm. And I probably just have to accept it.