First of all, a plot ratio of 0.15 is a real luxury. Since this also applies to the neighbors, it guarantees privacy, a house with distance to the next one, lots of greenery. Thus the complete opposite of the 0.4 plot ratio city villa deserts in white and gray with boxwood in a granite splinter bed in front and Q5 on the clinical driveway. Given the size of the plot, a 10 by 13 house plus terrace is feasible, 10 by 13! That means, with an upper floor, easily 145 sqm of living space. Well, if that's not enough. I see zero problems for the planning. Karsten