Penthouse floor plan - Is it that practical?

Just now it occurred to me, you could also make the workshop only half as big. Leave out the wall in front of PKW1 (the right one) and place the bicycles there (they still have to go somewhere) and the motorcycle, and let the workshop be a workshop.

A workbench doesn’t need a partition wall. Especially when, because of the motorcycle, parking and workshop space flow seamlessly into each other, it makes sense not to build a partition wall. The wall only creates the need for more space for passage areas, which you then need on both sides (so doubled). I wouldn’t increase the width: you can just push the motorcycle through if one of the cars isn’t parked inside at the moment. And that you sometimes want to get in or out on both vehicle sides in the garage during rain doesn’t happen with two cars at the same time either. Adding up all possible comfort clearances, the garage would otherwise easily become bigger than the residential area for humans. With so much fuss about the motorbikes, the tail wags the dog in proportion. Six and a half meters of interior width as planned is already absolutely first class.

A workbench doesn’t need a partition wall. Especially when the motorcycle parking and workshop area already flow seamlessly into each other, it makes sense not to build a partition wall. The wall only creates additional space requirements for passage areas, which you then need both in front of and behind it (so double).

So you mean I shouldn’t put up a wall there at all? (that is, between the workshop and garage)

I wouldn’t widen the width: you can also just push the motorcycle through if one of the cars isn’t parked in there at the moment.

Well, that’s impractical. I don’t want to have to drive a car out first before starting the motorcycle tour. An alternative might be to go out the back and around the garage to the street, there is space for that, but then everything probably also has to be paved.

And the fact that in the rain you sometimes want to get in or out on both sides of the vehicles in the garage doesn’t happen with two cars at the same time. Adding up all possible comfort distances, the garage would otherwise easily be larger than the living area. With all the fuss about the motorbikes, the tail wags the dog in comparison. Six and a half meters of interior width as planned is absolutely already first class.

Yes, I’ve also wondered how everyone else manages with “such narrow” garages. But I don’t want to regret afterward having built half a meter too narrow just to save €2,000. As said, on the right you really need a bit of space to get from the utility room to the workshop or the other car. So there should definitely be 1 m of space there. If I take the already planned 6.50 m: minus the two cars (2 m each) leaves 2.50 m, minus 1 m on the right leaves 1.50 m, leaving 0.75 m between the cars and to the wall on the left. That’s enough for opening doors. But I can’t use the outer wall next to the left car. Where do all the others store their winter tires and other stuff?

That is also a good point. However, then we have a long hallway in that area. I'm still unsure how that will look.

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That's why: turn the stairs.
Opposite the stairs, you can then install a frosted glass panel.

Where do all the others store their winter tires and other stuff?

In such a large workshop, that shouldn't also be next to the cars.

So do you think I shouldn't put up any wall there at all? (that is, between the workshop and garage)

Yes, at least not a continuous one. I do see pillars on the sides and a beam if you want that additional meter of width.

Well, that's impractical. I don't want to have to drive a car out first before I start the motorcycle tour.

I meant that normally not both cars are driven in for every single hour of non-use. In most double garages I know, at least one car only goes in for sleeping and is allowed to play outside during the day. However, if the second car is really just a second car and the first car only has a winter license plate, that's different, and then you need a wider aisle between them. I calculate as follows: S-Class and Golf, one forward and one backward means driver doors facing the central aisle; 40 cm (including mirror width) on each outside, which (again: mirrors hanging in) allows a solid 2 m central aisle at 6.50 m.

For example like this:

Then I basically have half a wall left to place shelves or similar.

And the frosted glass panel, then basically at the landing of the stairs, so next to the front door but higher up.

House design
Who designed it: Do-it-Yourself,

This can be seen, for example, at the entrance area. Instead of a nice, representative entrance area, you see the wardrobe, which a professional would have hidden somewhat.

The utility room, kitchen, and WC would have been placed next to each other by a professional because of the water supply and drainage connections.

Instead of orienting the seating area to provide those using it with a generous field of vision, the view is greatly restricted by the right-side wall and the wall directly in front of it. This is not how one builds nowadays, not even in social housing.