Floor plan for a single-family house 150 sqm - window and bathroom planning

Good idea!
That would also make bathroom solutions possible on the upper floor where the toilet is placed on the north side. Otherwise, that is not possible because of the 100mm pipe and the entrance below.

If the entrance and the toilet are swapped, the entrance area becomes very dark - that doesn't bother us so much in the guest toilet - currently, we don't have a window there at all. We are also a bit afraid that people will constantly bump into the car parked under the carport. Therefore, we thought about adding a roof over the front door afterwards.
I will definitely keep the swap in mind. Thanks!

Would you have any ideas/comments regarding the storage space or even alternative floor plan ideas for the bathroom?

The most elegant solution is the most obvious but also the simplest solution: bathroom door, double washbasin on the left side, toilet by the window.
Opposite the bathtub and shower, you could potentially switch both.
The bedroom could do without a door if you take 1 sqm from the hallway.

If still possible: It is always nice when you have the destination in sight through the front door. Living space should welcome you. Unfortunately, this was not achieved here due to the layout’s twists and turns.

At first glance, the thing looks quite nice. But on closer inspection, I can’t warm up to it. Unfortunately, I can’t immediately see the property dimensions. Therefore, the statement that rotating the house wouldn’t be possible remains rather vague to me. Two things that immediately catch my eye in the outdoor area: 1. The outdoor unit of the air-to-water heat pump stands directly next to the terrace. That thing is not silent – you should keep that in mind. I don’t know how often it kicks in during the summer, but I would inquire about that again. 2. The big tree is mandatory? So close to the house? I also plant trees wherever possible, but I don’t go closer than 10m to buildings. It’s less about the crown and shade, but mainly about the roots. Apart from that, I see light wells in the terrace – what do those look like? That’s possible, but if it’s not necessary, I would avoid it. Expensive and hard to use. Where are the bicycles and the like kept? Here, one could consider an outdoor staircase for the bicycles to the basement. I would also sketch in trash bins.

Inside, unfortunately, somewhat bleak hallways come up, where in my opinion the imagination is lacking. On the ground floor, when you turn toward the living area after entering, you look against a wall. That’s not very inviting and has already been criticized by Yvonne. Here, I would dispense with the large space for the TV and plan a double door or glass wall to appear more inviting. Who watches TV nowadays anyway? Upstairs, the narrow long stair hallway is even more oppressive. How much light is left from the loophole on the “gallery” (the name is almost a bit cheeky) is also questionable. I would definitely consider additional light from above there.

Also: Ground floor: The dining area lacks a bit of depth. It is just the minimum size. The dining table constantly gets in the way because it is one of the main traffic areas. That would annoy me. How big is the shower in the guest WC – looks tiny? Upstairs: The T in the bathroom upstairs is indeed unfortunate. However, I see too few bathroom dimensions to make sketches. Bed under the window is more of a last resort – also here just the minimum space for placement.

Overall, not a disaster but also not very inviting. To me, it’s all too tight everywhere because too many minimum dimensions are being built.

If still possible: It is always nice when you have the goal in sight through the front door. Living space should welcome you. Unfortunately, this was not achieved here due to the layout

That is exactly what I had already mentioned and in my opinion is the biggest drawback. +Stairs!

I would simply suggest pulling the carport a bit further back so that the entrance can switch with the pantry. The entrance then opens into a nice kitchen with a view of the west garden. However, the building boundary is not clear to me whether it allows this. Can it be called bold that the staircase runs perpendicular to the entrance side? I don't think so. I am of the opinion that it is incorrectly placed in the floor plan, namely along the length of the house, which results in disadvantages.

Unfortunately, due to the building boundary, the carport cannot be pushed any further back. But what do you think about swapping the entrance and the [Gäste-WC]?