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  1. Accomplished_Tip3597 on

    the house was probably split in two seperate houses at some point and they had to give the new house the “a” at the end of the number

  2. mizinamo on

    Not uncommon in Germany to have 9a next to 9 (rather than 9a + 9b).

  3. agrammatic on

    To go for 9+11 or 9A+9B, you need to know in advance that the house will be split.

    If you don’t know that in advance, 9+9A is the only thing you can do if you want to avoid renumbering original house 9.

  4. DerMichiK on

    If it was planned like this from the beginning, numbers would have been 9 + 11.

    If it would have been redeveloped and house no. 9 was replaced by two new houses, those two would become 9a + 9b.

    However, if house no. 9 stays as it is and a new one is built e.g. in its backyard, that one becomes 9a and 9 stays as it is.

    Renumbering existing houses is usually avoided since that means quite some inconvenience for the people living there as they would have to change their address everywhere as if they had moved.

  5. monscampi on

    Happens when old houses have huge yards, so they split the plot to build another house, so that house is 9a because all other numbers on the street are taken.

  6. JustResearchReasons on

    In the beginning, there were house 9 and 10. Then another house was built in between, that is 9a.

    EDIT: in most German cities, the new house will have been built between houses 9 and 11 with number ten on the opposite side of the street, but you get the gist.

  7. This is quite common in Germany. Normally it goes like: House number nine had been there already, so did numbers seven and eleven. (The numbers on one side of the street are normally all odd or all even) Then they build a new house (probably in the backyard of nine) and needed a number for it. 7,9,11 already were given. Renaming 9 to 9a would cause confusion from people still using the old address. So number 9 stayed number nine and the new house became number 9a.

    If new houses are built and letters shall be used (semi detached houses sometimes have that although most houses use numbers only) they typically are named 9a, 9b,… Without having a separate number nine.

  8. VanillaBackground513 on

    Usually, the story behind it is that first there were the houses 7,9 and 11. Then a new house was built between 9 and 11 or somewhere in the number9 plot, but they did not want to change 9, so the new house is called 9a. Or house 9 got an additional apartment.

    If it is a building complex where the houses are all built at the same time, they get called 9a, 9b, 9c from the beginning.

  9. bahnfan159 on

    Normally:

    One side of the street gets odd, the other even numbers.

    The letters are used, if you hat the houses: 5, 7, 9, 11, 13 and then build a new house between 9 and 11. So you can number the new house without renumbering all the other houses.

    Another reason can be, that you have the numbers 5, 7, 9, 11, 13 directly at the street and behind house 9 is another house build, then this house gets number 9a.

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