Single-family house with double garage

Some hairbrained ideas will probably have to be gotten rid of after all, I’m afraid. A shower in the utility room is really unique. It’s much better integrated into the guest bathroom, and you can definitely manage it so smoothly that the dirty clothes hardly or not at all end up in the rest of the living area. It’s also about the fact that otherwise you’d have to declare the entire utility room a wet room and build it accordingly. Throwing the kids’ stuff in the utility room is done as an emergency solution in an existing house that’s hard to redesign. In a new build, I build a cloakroom, as big as I need it. The stair request looks completely unrealistic to me at the moment. It was already tight with a spiral staircase. I would like to see a landing with numbers and facts. How big and exactly where is the building envelope? I wouldn’t give up so quickly on more garage width. The huge kitchen island is hardly manageable and doesn’t make cooking any nicer. The walking distances become endless and in the end there is no space left for the dining table. But you can certainly test and see that in the kitchen studio. The “Mäusegang” here is, in my opinion, the hallway to the guest bathroom. Although it says 130, somehow that doesn’t add up, does it? The door is almost as wide as the room – meaning the room is about 1.10m or something similar. But those are minor details. Also, in my opinion, the pantry is too narrow to use it effectively – but everything is solvable.

I don't want to dwell on it further, but as already mentioned, a lot is not quite right.

The utility room really has everything in it. Technology, a shower, washing machine and dryer

So it will be a room where the man's odor-bearing clothes, which are unpleasant, share the room with fresh laundry. Where laundry is sorted as well as Christmas decorations are stored. Where the children take off their dirty boots and the man showers.
That already makes chaos and bad mood inevitable. I would plan some space upstairs and initiate a laundry room there. It also makes sense to include a shower in the guest WC for the man, so he feels a bit more valued. Later on, the children would also benefit from the second wet cell.

The staircase is supposed to be a staircase with a landing.

As Kerstin has already mentioned, the wall for the staircase is too short.
With a normal ceiling height, I reckon at least 3.70 meters of staircase length. A landing of one by one meter makes the staircase one meter longer. With 2 starting steps, a wall of at least 420 cm length is needed.

That’s why the corner in the bedroom, that’s still a recess for the ceiling, but it couldn’t be done differently in the program.

The recess probably isn't needed here with 2 steps.

The kitchen island should simply be big enough for all the tasks you don’t want to do with your back to the family, so cooking, washing, chopping.

It is still too long. It does not allow ergonomic cooking or food preparation. You wouldn’t build a garage of 3 x 12 meters (width x length) just because 2 cars need space, but then only park them one behind the other.

And where do you think more windows should be?

Upstairs! Upstairs hardly any light comes into the house. The bathroom has no window or just a double casement window. That is almost inadequate for a new build. The remaining windows are too small for the rooms.
Regarding the bathroom: what kind of mini door is that? If a normal room door doesn’t fit there, the planning must not just be ended; one has to redesign or get a professional involved if one can’t even reach a normal standard. That also applies to the hallway expansions, which has described as mouse corridors. I assume that because the hallways resemble these test labyrinths for mice. (Wrong turn, no cheese, the next path brings the reward )

The airlock is therefore very practical for us because the children simply have a lot of outerwear and I don’t want it in the entrance area.

But they don’t just automatically walk past a car through this door. Between the car and the wall there isn’t nearly enough space to comfortably or scratch-free slip past the car. Not to mention with backpacks, bicycles, and sports bags. Also, the garage will presumably be kept closed, right?
The garage is about 5.50 meters inside. With two cars of 2 meters each, 1.50 meters remain, divided into three areas. That means 50 cm of corridor... and that should now be used instead of the main entrance? I would reconsider that carefully in your place.

This way he can drop off his clothes there and immediately shower downstairs after work without "contaminating" everything upstairs.

See above: downstairs the utility room section in the measuring room gets contaminated.

The initial idea is nice, but since the staircase must work above all else, an architect should take over here who also exploits this huge space.

Apart from the utility room, where a total of 3 (!) doors reduce the usable space so much that 15 sqm feel like 10 sqm and thus no longer qualifies as "oversized," you haven’t planned a single storage room? With three children? We are two and have deliberately planned a storage room on each floor, plus closed off the stairs to create even more space, and although we are definitely not hoarders, it’s just enough. And you really don’t want to manage everything via a floor hatch...

How big and exactly where is the building envelope? I wouldn’t give up so quickly for more garage width.

The building envelope is exactly where it is marked on the "garden plan." If we want to change the building envelope, we have to go through the approval process. Duration from 9 months upwards. But since we of course still want to take advantage of the Baukindergeld, that is unrealistic for us, so we are building within the building envelope and the development plan.

But people don’t just automatically pass a car through this door. Between the car and the wall there isn’t enough space to comfortably and/or scratch-free squeeze past the car. Not to mention carrying a backpack, bicycle, and sports bag. Also, the garage will probably be kept closed, right? The garage interior is about 5.50 m. With two cars of 2 meters each, 1.50 m remains, which is divided into three areas. That’s 50! cm of aisle... and that is now to be used instead of the main entrance? If I were you, I’d think about that carefully.

I agree with you that it will be tight, and we have already thought about it a lot. The children don’t have to go through the garage. They can also enter from the front door into the utility room to hang up their stuff there.

Apart from the utility room, where a total of 3 (!) doors reduce the usable space so much that from 15 sqm it feels like 10 sqm and thus is no longer "oversized," you haven’t planned a single storage room? With three children? There are two of us and we have planned a storage room on every floor, also closed off the staircase separately and thereby generated even more space, and although we are definitely not hoarders, it is barely enough. And you really don’t want to manage everything via a crawl space...

A built-in closet will still be installed under the stairs, and the office does not necessarily have to be used as an office. We can also install storage space here if needed. The bedroom is very large; I also hope that a planner can find some corners for storage.

Best regards

Ambrosia

The building envelope is exactly where it is marked on the "garden plan".

Sweetheart, you are talking to freaks here who juggle centimeters and play Tetris all day for fun. With information like "back there," "around the corner to the right," or "should be enough," you hardly lure anyone out from behind the stove here. Only facts in the form of numbers count here.

Under the stairs there will be a built-in cupboard and the office does not necessarily have to be used as an office. We can also add storage here if needed.
The bedroom is very large, here too I hope that a planner finds corners for storage.

Such statements are nonsense. Plan it from the beginning exactly as it will be used. "Hope" and "not necessarily" are the wrong terms here.