Well, Escroda.
This is not the first post from the OP (even though my search didn't find much anymore). Last year, the OP's questions and statements were also very unclear, as far as I remember.
We ourselves have a design framework here.
There isn’t much written in it. But it’s enough. In total, one knows about the concept. And the concept is also included there, namely why and how it was agreed on this or that. The design framework is part of our contract and was accepted by our signature. It may be that in NDS and Hamburg it is dealt with completely differently, it may be that I am completely wrong... but when I read in the justification of over 30 pages that garden houses are built via project construction and no additional ones are allowed, or the OP himself states that “additional garden houses are not permitted,” then that will be the case. But I admit, I only skim read. There are over 30 pages, peppered with reasons why tree A is planted per 4 parking spaces, why the infiltration areas must be built this way, etc.
I find the elaboration basically very coherent, and if one follows the project “Waldquartier am alten Zoll” or the “Oxpark” a bit on the www, one knows about the concept of the neighborhood.
For some, the neighborhood may have too many restrictions, too much sameness and rules; others like exactly that.
The project also has a color concept according to which strict building was done.
I just see: the corresponding link has been deleted again, yet it is available to the OP. And there is also the phone contact listed for questions from the urban planning authority.
It may be that it has already been used. The OP also got a negative answer.
But when I read the initial thread from January, I find it somewhat strange to live in such a neighborhood, i.e. to buy something without having dealt with the concept once and then not to like parts of the house one bought.
It’s certainly unpleasant not to have enough space, I understand that, I write that, but I guess one has to make the best of it.
Sorry if my answer here is a bit unstructured, but I have been struggling with the selection tool in this forum for some time, so I can’t move paragraphs.