Residential unit in the basement

You should beforehand take a look at the respective state building code, where among other things such as:

[*]Room height
[*]Window area in relation to the floor area of the room
[*]necessary parking spaces
[*]...

are regulated.

You do know that you can only apply for as much promotional credit as the housing unit to be built is worth, right?

How is this supposed to be separated specifically? Are the cellar costs then allocated proportionally to the cellar apartment? And what about the cellar ceiling, does it belong to the cellar or to the ground floor?

Counterquestion, how is the value of a condominium in a building with multiple apartments determined? There are plenty of ways to determine the value.

If your idea were the solution, everyone would probably do it. You have not found the [Ei des Kolumbus].

I would discard this idea as quickly as possible if there is no serious real interest in two residential units. Instead, the whole thing is only supposed to serve on paper to fraudulently obtain funding.

I'd rather not say anything about that... I just shake my head at some ideas to save a few bucks - you can't be surprised if funding eventually runs out because some people still aren't satisfied. Interest rates are at rock bottom, the pot is shrinking even more, and that is also being exploited.

Just turn every basement room into a living unit, the city pays rent per unit. Oh right, you don't even want to rent it out ... :)

So I can understand both sides here... but I wouldn't stretch it too far and just assume bad intentions of the OP. The times when people turned a chicken coop into a residential unit are over. If there is serious interest in a second residential unit here, it has to be properly planned anyway. Then you also have the costs on the table. After that, the whole thing also needs to be approved. It makes sense to address something like this as early as possible. Ideally with the planning of the entire project. That's how our single-family house became a three-family house, silly terminology. Whether you actually rent out the residential unit or just put boxes in it is up to everyone. But you should realize the project as planned, meaning a separate unit with cooking facilities and a bathroom. It can very well happen that someone from the building authority comes for inspection. Since construction has already started here, meaning the building application has been approved and the execution planning is finished, I would estimate that the change costs will far exceed the funding. Unless you include the residential unit as a rental in the financing, but that is not planned either.