You have to let go of the idea that "it is dark in the north" and restart your hard drive. Yes, there are only a few days when the sun still shines through the window into the house in the north. Then you simply build the stairwell with a panoramic window or a small gallery where you can possibly sit in the incoming sun. In the living room, you often watch TV in the evening anyway, so you overestimate incoming sunlight there. You also don't necessarily have to look into the garden there. You usually don't stand in front of a window wanting sun. In the garden, the property often gets light from 2-3 sides... while some treat themselves to one or two knee-high windows in a sunny all-purpose room, you can plan a panoramic window or terrace doors facing the north garden yourself. You can also bring in more light or sunlight from another side with a staggered shed roof on the upper floor or bungalow. If the building plot allows it (which you cannot see in your case, wrong site plan), then you can set the house back, and an L-shape also shields the living room garden from the entrance area. Many things are possible if you get out of the standard "city villa" mindset. It depends on yourself what becomes more important. A garden does not only consist of a terrace but different seating options. In the evening, a bench in front of the property guarantees the sunset. If it is very warm in midsummer, sitting in the shady east garden is better than in the windy west garden. By the way, a north garden gets the sun from early afternoon.