Planning or room layouts - What do you think about it?

... you still have to keep the building within the floor area ratio I.

You want to become a property developer, with a batch size of two single-family homes, but not as a duplex. Whether both houses look the same or are unique pieces (of which you only show one of the two models here), we have not yet learned. I assume you have the creditworthiness for the operation; the instigator is a financial advisor; and whether you end up finished or not is irrelevant for his profit. Let the warning sink in – better than the bullet afterwards – that this is nonsense: the little house with the choir bay window is such an individual matter of taste that you would only even start building something like that with a concrete purchase guarantee. In general, any sensible owner of a 1,038 sqm plot would look for a buyer for the raw plot who has already paid for the subdivision; and then, with the money for one half and the subdivision fee paid by the buyer, merrily whistle while waiting for the buyer for the second half – given the current market situation, probably not even for the length of a cigarette. Whether the two then build E or D on it could be indifferent to you. At most – if I absolutely wanted to still capture the added value of building on it – I would put a duplex on it, but not without knowing it is sold concretely. In light of day, you won’t have to think long about why I suspect a financial advisor behind the harebrained idea (and you as its useful fool).