The storage room MUST have a freezer compartment, and on the right when you enter, a shoe cabinet, a small coat rack at the front wall, hooks are enough for me, for us and some on the door for guests, and the remaining space a shelf for supplies. I will simply place the vacuum cleaner and cleaning items in front of the shelf, since we mop so often. Not really, although with children it's different and a house is different from an apartment,... I also have to clean upstairs, whether I bring the stuff down from upstairs or carry it up from downstairs, it has to be carried once. But I can also store it in the utility room.... yes, the pantry is small, but still big enough to fit everything in, at least I think so. Feel free to correct me.
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Drinks in the garage, or in the kitchen there is space on the right, on the wall, maybe there or I don't know,... maybe under the open staircase. So yes, I am definitely missing some storage corners, but I don't want to give up on all optics, I still give it some thought because I don’t have children yet, no experience with many things, and everyone here who has already built and lives with children writes, so that I don’t regret it later.....
So, briefly about the storage room/coatroom again. We also have no basement, and therefore planned a lot more storage space (but it still feels too little). I’ll do the math for you because I would want someone to point this out to me now so I don’t totally regret it afterward. Especially regarding your consideration of an open or closed staircase.
In the entrance area, sufficiently (!) many coat racks, a shoe cabinet, space for the stroller. We planned several meters for this.
Our kitchen has several tall cabinets, yet we still have a pantry for the freezer and drink crates as well as some shelves for supplies. This room has 4 sqm.
A technical room, in which only the building services are housed, and it is very full. This room has 10 sqm.
A room just for laundry and cleaning supplies. It contains the washing machine, dryer, laundry basket, shelves for cleaning supplies and also tools, a sink, and the vacuum cleaner, etc. In hindsight, this room could have been a bit bigger; the drying rack is already very cramped and must be tidied up after use, otherwise, you can’t reach the shelves well. This room has 5 sqm.
I know that a single-family house is hard to compare to a townhouse in that sense. BUT, you can try to use the available space as efficiently as possible.
I wouldn’t describe myself as someone who keeps and hoards an excessive amount of things. But some things simply need more space than you think here now, e.g., the freezer. If you put it in that small room, it’s actually full. You also can’t put anything in front of the freezer door. But then where is your coat rack?! Not to mention any shelves for supplies.
I would recommend closing off the staircase and extending the storage room. Then, as already suggested multiple times, make the kitchen narrower and accommodate the coat storage here. The solution looks very sensible, and nobody needs two tables right next to each other. Especially when it’s such a “waste” of space.
Please consider carefully what will be important to you in the future. Especially if children are on the way/planned. :)