Are two small houses allowed instead of one big house?

The development plan contains no other statements in this direction. It basically consists only of a few general sentences. (70sqm floor area, single-storey, no outbuildings).

Hello Vicky, 1. because they do not work on weekends and I have so many questions to clarify that I would like to work through as many as possible now. 2. because I am interested whether there are any rulings or other sources related to this that I am not thinking of at the moment. 3. because I also do not want to call the building regulations office for every question. The lady already knows me and it is unpleasant to annoy someone. 4. because the building regulations office is hard to reach and I work during the week and do not often find time to call there. and 5. because I want to help others who might have the same questions - for example on a holiday - and therefore research on the internet, when they find the answer to this question after a short internet search. And moreover, this forum is happy when it gets more visitors.

And does the gap between the little houses then count towards the 70sqm?

Well, you are going to become a premium customer at the office

No outbuildings seem to be included in the answer.