Approval procedure granted, is change possible afterwards?

The architect owes an approvable plan. This does NOT mean designing a house in such a way that it could also be approved in an area with a stricter development plan. From my point of view, he clearly did not complete his work according to the contract – but I am not a lawyer (and you should not consult one specialized in rental, divorce, or traffic law here). Go to two experts: a lawyer familiar with the legal field and then a competent architect. No architect has the right to build a submissive house for their client and also lie to them about what is supposedly not possible according to the development plan. Do you want to build with a detached building so that he might therefore have fears?

I am of the opinion that whether one values higher ceilings or not also depends a little on one's own height.

When I had just stopped growing, dangling light bulb lamps from the ceiling were still common. Seen this way, I could omit a whole row of bricks in room height today. According to Le Corbusier, I would need room height 226.

I already have the approval exemption, but as an uninformed person, I asked other architects about the height and the roof pitch. The old architect is being obstructive, but I have an appointment with him on Monday to see what comes of it.... he believes that approval costs extra, even though I pointed that out to him beforehand and he was just telling me fairy tales about why it doesn't work.

I already have the exemption from approval,

... and this is linked to the liability of the plan author for compliance with the conditions that would apply for approval. However, nothing is checked here, so the architect does not get a stamp saying everything is okay. This is no good for scaredy-cats.

... and this is connected with the liability of the plan author for compliance with the conditions that would apply for an approval. But here nothing is checked, so the architect does not get a stamp that everything is okay. This is no good for scaredy-cats.

For scaredy-cats? What does that mean? Here in our city they just glance over it roughly but you are right, the designer and the client are responsible for complying with the regulations. However, I think that I still cannot just make the roof 5° steeper, even if that would still be within the building plan regulations... The house would then not correspond to the submitted drawings but probably to the regulations of development plan B.

At our city, they just glance over it roughly

I only know the permission to start with the note "the submitted documents have not been checked". The planner thus does not receive an explicit clean bill of health that he can be relaxed.

Scaredy-cats

What do you mean by that? Am I overthinking it? Just do it as long as it is within the limits of the development plan?

, yes, that’s probably how it is, the city still roughly checks to find mistakes in order not to grant the exemption, because they lose a lot of money that way. (Exemption 50 Eur) Building application around 1000 I believe, including inspections and review of the drawings. The architect is old, he doesn't really care, I should probably be more worried. But after many hours I am slowly getting an understanding of what is allowed and what is not.