5 children's rooms, separate parents' area with dressing room, guest room on the ground floor, 2 bathrooms + an additional shower bath on the ground floor as well as enough storage space on all floors. So we end up with round about 230 sqm without basement plus garage 3.00 x 9.00 m; plenty of space indeed
Wow, five planned kids! You really don’t see that much anymore these days. Really a pity.
How big are the five children's rooms? I’d really like to know. I don’t even know if I would really make a separate room for each child; until they’re about 10 years old, two can easily share a room. With a nice bunk bed, you can set that up really well.
DNL – I would definitely plan for lots of cupboard and shelf space in all the rooms, closets preferably up to the ceiling (built-in wall in the bedroom, for example). Depending on the age of the children, maybe bunk beds in the children’s rooms. Underneath you then gain additional play space and can perhaps fit another chest of drawers or something else elsewhere.
And definitely tall cabinets in the kitchen too. Ours, for example, go almost up to the ceiling. In the topmost compartment, I keep things that I would otherwise put in the basement because I rarely use them (waffle iron, raclette, fondue, etc.). Pay attention to the plinth height. If you choose a low one, depending on the provider, you can fit an extra row of drawers (for example, we have only an 8cm plinth and therefore 4 instead of only 3 drawers).