because a window is positioned in the wrong cardinal direction and is not in accordance with the development plan.
Interesting. I have never read that a development plan specifies the cardinal direction of windows. Can you quote the development plan literally?
This special permit now takes another 2 months.
... and costs additional fees.
We request a meeting with the construction company and want to insist that they cover the costs for the building notification
Good luck. If a two-month delay already has catastrophic consequences, what will the dispute with the construction company cause?
but that does not automatically make the architect bad
It's a pity that I do not know point 6.3. But if it says that windows facing north are prohibited, and she plans a window facing north, that would be quite bad.
Or does it now make sense to cancel the ongoing building application
Yes, if you have found a draftsperson authorized to submit building applications whom you trust and who is willing to file the building notification.
or could it possibly result in even more chaos?
Only you can judge whether you can expect that much flexibility and competence from the construction company.
but due to this change we are out of the simplified procedure
Most likely because of the aforementioned window.
The architect advises against it, apparently does not want to take any risks because in this case you are basically building without any permit and later are liable for possible deviations yourself (which we basically do not have).
She has already proven her incompetence. And you want to hand over full responsibility to her?
It remains, in my understanding, incomprehensible to nonsensical: where a permit exemption and a building notification differ, the latter usually applies to permit-exempt but notification-required buildings, which in some federal states can be, for example, single carports.
That is due to the fine peculiar differences in the federal states. Sometimes the procedures even have the same name but quite different requirements. The simplified procedure in Brandenburg has very little to do with the earlier simplified procedure in NRW.
We (so we and the architect) are jointly liable now in the simplified procedure
Speaking of smart aleck comments: you mean the permit exemption according to §63 Building Code NRW 2018 (formerly §67), and not the simplified approval procedure according to §68 former version.
we got kicked out of the simplified procedure and now have to take the normal route with a 2-3 month deadline
In the simplified procedure, the authority can also take 3 months according to §63, paragraph 4:
(4) A decision on the building application must be made within three months after submission of the complete application documents; the building supervisory authority may extend this period by up to two months for important reasons vis-à-vis the applicant. The application shall be deemed approved if no decision has been made within the period specified in sentence 1.