Site coverage ratio, permeable paving for outdoor facilities

since the plan was submitted and approved as is?

Otherwise, there were no conditions since it was a permit-free procedure?

This is a contradiction. It is probably the exemption procedure according to §67 Landesbauordnung. The municipality and/or the building supervisory authority then have nothing to check because they also approve nothing. The architect and the builder are responsible for compliance with all regulations. The construction documents also include a comprehensible calculation of the site occupancy index/floor space index. If that fits and you do not want to deviate significantly from it, you need not worry. Even if the excerpts from the plans were chosen very sparingly, it looks to me as if you are far from the 20% limit. However, this should also be demonstrated in the construction documents. In general, it can be assumed that no one will come to measure, unless you massively exaggerate with the paving.

Honestly, I believe the architect was not particularly motivated, as I took a lot of work off his hands regarding the positions of the house and so on.

In the end, he earned his money by signing the building application and measuring the height level; the rest came from the prefabricated house company and my cooperation.

I hope the current screenshots are more useful.

Basically, I have already noticed that in the site plan, unlike in the development plan, a 3m boundary window to the neighbor/boundary construction is shown in the site plan, whereas in the development plan, only in the area of the street front the 3m distance to the building window is specified.

Thus, the carport and the shed would lie within the normal building window and not in the non-buildable 3m area because according to the development plan, that area does not exist towards the neighbor?

Honestly, I think the architect wasn't particularly motivated

If that was the original input plan and the original area verification, you are probably right. Both the calculation and the site plan are error-prone and incomplete. You can be glad that the municipality did not require an approval process. I don't feel like recalculating now, especially since the development plan apparently isn't available online, but roughly I don't see any problems. What exactly are you afraid of now?

I just have to ask again, from the interpretation this would mean that everything belonging to the main building and actually within the building envelope must comply with the 0.3 floor area ratio, except for ancillary facilities such as carport, driveway, or if I include those, it could also be 0.45?

And everything that I want to pave in this 3m boundary area (i.e. in the non-buildable area) facing the street may make up a maximum of 20% of the entire non-buildable area?

Floor area ratio I: Residential house + terrace = 120m² + 28m² = 148m²; 148m² / 668m² = 0.222 < 0.3 => fits
Floor area ratio II: Floor area ratio I + roofing + carport + storage room + driveway = 148m² + 11m² + 33m² + 12m² + 80m² = 284m²; 284m² / 668m² = 0.425 < 0.45 => fits
Additional condition: Sealed surfaces outside the building window / non-buildable area = 20m² / 168m² = 0.119 = 11.9% < 20% => fits
If you replace my estimated values with the actual ones, you will get the exact values. But even the floor area ratio II still has room for improvement, and it is no longer about obtaining a permit, is it?

Super thanks for the explanation now I got it... And everything fits so far... Besides, the building permit is already available. I just wanted to make sure, don't want to plan/replan any paved areas that I might have to tear out again if after 2 years someone from the building authority takes a look or aerial photos are taken. Thank you for your help