I don’t even know why people always have to talk everything down.
There is quite a lot that fits for a townhouse. Apart from that, I have already been in several Viebrockhaus houses. They also work with a "staircase in the dirty area." If something like that is criticized, even by me, then it is a point that is not optimal; nevertheless, such a floor plan works, especially in a small space.
Well, now we are not in a small space here, nor in a Viebrockhaus, but with a floor area of just over 90 sqm of another general contractor, and the layout is well done. What is missing in most cases is present here. Yes, you can always complain. But you can also accept that you have to divide 150-160 sqm and allocate more to the living space than to storage space, which otherwise appears cramped. A large kitchen with a lot of cabinet space does not need a pantry, for example.
My cloakroom measures just under 2.50, the bay window about 3.50. Usually, there is the budget version of 2.50, which you can hardly use. The open plan is airy and easy to furnish. Stop! Provided you swap the living room and kitchen areas. Otherwise, the living room can become too wide, and the kitchen can be less furnished. Here you don’t even need a pantry; that many cabinets fit in. The room for the office is sufficient and functional. It is not supposed to be a guest room anyway. In Hamburg, there are also plenty of B&Bs where you can let your relatives sleep for 3 days.
The sofa is 2.70 wide.
Whether you leave the floor-to-ceiling window for symmetry or not, or shift the office window a bit so you can place a cabinet better, that’s debatable. Personally, I don’t like these symmetrical houses because of their corset, but those who do like them can then ponder how to implement something like that.
There could be problems in the shower toilet. The toilet will probably be used more often later since there are three children (I hope no one now comes up with a children’s bathroom upstairs or something like that). If you plan a washbasin with a depth of 50 cm, then it can get a bit tight with the toilet. The shower is 80 x 80, but will probably get a bit more space due to plaster and tile. I would invest some more brainpower here, as well as the idea with the bathtub, which is good for much more than just bathing.
As for what the budget allows and what your calculations look like, I’ll stay out of it. You have to see for yourselves where there is potential to save.
Therefore: I don’t see why one always has to take a step back and wave the architect away. That is pointless in this case, because he also can’t optimize 20 sqm of living space for less money.
Here’s an example of how it could be. I also don’t see a problem with the parking spaces. You plant a hedge and have space for a yard. That was once your problem, wasn’t it, or was it another user? There was once a time when there were plenty of these great plots of land to discuss.