text: Hi Kjarraval, I would normally follow the on-the-ground-rule, but Iceland has https://geo.fasteignaskra.is/landeignaskra/ as a very nice source, so I am not sure now how this applies. I suppose the street register is the official truth in this case?
  See also the notes https://www.openstreetmap.org/note/688726 and https://www.openstreetmap.org/note/688725 which I have surveyed yesterday: on-the-ground, I could find the numbers 2 and 3 at the building, but according to the register, it should be number 7. Since this is a very similar case, which applies? I think I would leave the number 7 as tagged with the building, and 2 / 3 as nodes respectively?
  Sorry for referencing another note, but they seemed to have the very same problem.
  Have a nice day :)