Preliminary construction inquiry for land purchase: What should be considered?

Hello everyone,

After a long search, we have now received the opportunity to purchase a plot of land in our municipality. Since the plot is not located in any building zone or similar, we would like to submit a building inquiry before the purchase. However, as we do not yet have a concrete house design, the question for us is which information is necessary or recommended for an inquiry, specifically:

- Does the plot need to be surveyed in advance, or is an approximate indication of the plot dimensions sufficient?
- Is it mandatory to submit an inquiry through an architect or the developer, or is this advisable?
- Is the owner’s consent necessary for the inquiry?
- How detailed must the information about the planned house be? Are indications such as: 1.5 storeys, gable roof, footprint, etc., possibly sufficient?

And do you have any further tips and suggestions we should consider?

Many thanks and best regards :)

10 seconds on Google yields:

Documents for the building preliminary request
Which documents and proof you need for a building preliminary request vary depending on the federal state. The required documents include, for example:

Form for the building preliminary request
Excerpt from the cadastral map
Building and usage description
Building drawings
Plans for drainage and water supply

Depending on the federal state and the content of the building preliminary request, it must be submitted by an authorized person, for example an architect.

So just a simple "Yo, building authority, we want to put a city villa here, cool, right?" Isn't that...

Thank you for your note, we have of course done that. However, since we did not quite understand it from the research, we wanted to ask the community here in the forum once again.

But almost everything is already there.
Your questions 1, 2, and 4 are answered by this 10 seconds of research.

What exactly do you want to know more about?

Maybe a bit of background: Specifically, the plot is to be separated from an existing parcel. For us, the question now is whether the preliminary inquiry should be made with the old parcel or whether a survey of the new plot is necessary beforehand. It is also not entirely clear to us whether a preliminary inquiry is better made with an architect or whether private individuals can also do this without any problems. And regarding the (required?) construction drawing: How is the situation handled if one is not yet available? Are then also sketchy details like those mentioned above sufficient? What are your experiences with this? :)

Perhaps a bit of background: Specifically, the plot is to be separated from an existing parcel. Therefore, the question for us now is whether the preliminary inquiry should be made with the old parcel or whether a survey of the new plot is necessary beforehand. It is also not entirely clear to us whether a preliminary inquiry is better made with an architect or whether private individuals can do this without any problems. And regarding the (required?) construction drawing: How is the handling if such a drawing is not yet available? Are sketchy details like those mentioned above sufficient? What are your experiences with this? :)

I would first of all want to know whether one can/is allowed to simply divide the plot like that. I know a case where a plot was bought with the intention of dividing it and this was then prevented by the municipality.