Carport deviation from the building application

Procedural freedom does not mean that everything is allowed.

That is correct. But what does this statement refer to?

That is correct. But what does this statement refer to?

#8, not yours

In short, regards

#8

But that does not help the OP. He wanted to know how far he may deviate from the building application. The carport is apparently part of the building application. So he may only make changes that he would also be allowed to carry out without approval if the carport were already built, such as changing the roof design. Changing the size or location does NOT belong to that in my opinion, since the footprint of the carport exceeds the limit for procedural freedom.

you have a "hammer right" to paint your carport from the neighbor's property.

Then he must ask the neighbor. I definitely consider the one meter reasonable. Unlike in NRW, in Lower Saxony it must not be less.

And happily rotting away.

Of course, attention is paid to constructive measures so that even two adjacent buildings on the common boundary do not rot.

Then he has to ask the neighbors. I do consider the meter sensible. It must not be less, unlike in NRW, in Lower Saxony.

It is simply nonsense to keep 1 meter free at the border just because you want to paint a few beams every 10 years. That is a hell of a lot of property that you still have to maintain unnecessarily.
As I said for the third time: coordinate with the neighbors on how you agree there. Above all, clarify whether you want to set one border row of "stones" together or if everyone cooks their own soup (less sensible, since everyone loses 20 cm and then you have a 2x15 cm gap between the properties). If you set one row of "stones," they stand exactly on the border and are concreted on both sides. Additional advantages: you can share the costs.
If you want to close the carport side to the neighbor with boards and the like, the neighbor does not need a hedge or similar there. He might make a flowerbed or something there. To then paint once in 10 years, you agree that you paint before he makes the flowerbed. I would not want to give up 9x1 meter for that. That’s like always driving a sprinter because you move furniture from A to B once every 5 years.

it is simply nonsense to keep 1 meter clear at the border,

We have it as well, and I find it very practical that my car is parked in the dry, but I can still open my doors generously
Thoughtless standards can never be good and I would always reconsider before it goes into implementation!