Einliegerwohnung - definition question

Hello,

I hope I am in the right forum here.

A question about a granny flat: Is a converted attic with various rooms including a bathroom, but without a kitchen, automatically a granny flat? In theory, the whole area could be lockable and accessed via the main entrance, hallway, and stairs to this area. But from the hallway on the ground floor, you can access all the rooms on the ground floor, which means the upper area would be lockable, but the area on the ground floor would be accessible to everyone, including potential tenants of the upper rooms. Which ultimately might not be in the landlord’s interest. Moreover, separate billing (electricity, water) would not be possible.

Another question: in the basement area, there are various rooms, including a kitchen, bedroom, and bathroom, but they are not interconnected and lockable. Can this be defined as a granny flat?

I am less concerned with the potential rental of these rooms; rather, I am interested in the assessment of whether they would be considered granny flats.

Question for you. As a third party searching for an apartment, would you want to rent these rooms as an apartment? The answer to this question is at the same time the answer to your question.

Without a kitchen, I probably wouldn't rent the attic apartment. And then the fact that a proper utility bill cannot be made would also bother me. As an owner, I probably wouldn't rent out the whole thing because every tenant would have access to all my rooms. The rooms of the main apartment are all freely accessible.

I certainly wouldn't rent the rooms in the basement, not because of the basement itself, but because all potentially rentable rooms were scattered across the basement floor. Each room would have to be locked separately. As a landlord, I also wouldn't rent them out.

For me, it's mainly about the value assessment, as some claim that the value of the house would increase massively because of these "subordinate apartments" that are not actually apartments.

My main concern is the value assessment, as some claim that the value of the house would increase massively due to these "granny flats," which they are not.

You have already given yourself the assessment. These are not value-increasing "granny flats."

I could also say: In my house, I don't need a basement room, the second bathroom is not needed, and a children's room is also free – and suddenly I have a granny flat and my house is worth much more.

Thank you, that is roughly the information I wanted. ;-)

Out of curiosity, can one roughly say by how much the value of a house increases due to a granny flat?

Just out of interest, can you roughly say by how much the value of a house increases due to a granny flat?

Well, a house with 200 sqm of living space will have approximately the same value or slightly higher than a house with 200 sqm where 160 sqm are the main apartment and 40 sqm the granny flat. It doesn't cost significantly more to build, after all.
For some buyers, the house with a granny flat might even be worth less because they are no longer solely "master of the house," but basically have to live like in an apartment with immediate neighbors who can watch them sunbathe naked in the garden.