Carport without building permit in Saxony

Hello, we live in beautiful Saxony. Here, if you place a carport on the property boundary, you do not need a building permit as long as you adhere to a few general rules. Among other things, I am bound to a height of 3m. Now to the question: Where is this measured? We have raised our property by about 40cm towards the neighbor. Since I need a clear driveway height of 2.40m, plus about 30cm roof construction, I am at 2.70m. So far, so good. However, if the neighbor measured with their tape measure, it would be 3.10m. Ergo, too high. How is this handled? After all, the carport is on my property, so only the height on my side should be decisive, right? I just don't want to make a mistake and, in the worst case, have to shorten the carport in height. Thanks in advance

Attention layman's opinion:

Original ground level height is probably the magic word.

Yes, but it is not recorded anywhere, I can at most see it at the neighbor's....

Yes, but it is nowhere documented, I can only see it at the neighbor's place....

However, he could be referring to that. The 3 meters (in the state building code) or the distance rules and height limits serve to protect others, so arbitrary actions are not permitted. The height, however, relates to the boundary development. Do you have the possibility to build with distance?

The question is how much distance do I need? I have 40cm distance, but no more. Is that enough?

The question is how much distance do I need? I have 40cm distance, but not more. Is that enough?

Unfortunately, I don't know that either. Check your state building code… it should be stated there.
You could also call Mr. Müller at the building authority, say that you want to build a carport without a permit, and then explain the situation.
Plan C: Is a mono-pitched roof an option, i.e., sloping towards the neighbor? But then pay attention to drainage.