Distances to the property boundary?!

Hello,

I have a question about how the distance to the property boundary must be.

So far I understand that if you want to build a house measuring 10 x 10 meters, the property must be at least 16 x 16 meters in size in order to maintain the 3 meter distance. Is that correct and unchangeable? Or can you, for example, build closer to the street front or closer to a forest area if the house is, for example, on the left side next to a forest area?

Best regards

The boundary distances are specified in the respective state building regulations and depend, among other things, on the building height. Building lines are sometimes defined by the development plans for the respective construction area, so inquire with the municipality.