Floor plan optimization single-family house: gable entrance and basement

I hope it is okay to ask for feedback and criticism at such an early stage. We thought the earlier we recognize errors in thinking or incorporate new ideas, the better.

This is exactly the right time!

The budget is too low at about 170m2. Is a basement really planned? Then at least 150k is missing.

Remove the basement and slim down to 130m2, then it might just fit.

Friends of ours are currently building a similarly sized house without a basement with a local general contractor for around 400k. I had now counted 100k for the basement. If that doesn't fit at all after the discussions, then we have to start over.

If anyone has ideas on how to reduce size without making the rooms too cramped, I am open to anything :-)

Welcome and Happy New Year!

This is exactly the right time!

I agree with that. Perfect timing. Time melts away like butter in the sun – you will see.

Regarding the draft very roughly at first:
it seems to me you haven't considered the slants in the bathroom and utility room.

Acquaintances of ours are currently building a house of similar dimensions with a local general contractor.

Similar can be very far from equal, which is why I have my own calculated completely on my own and then see if it costs a similar amount. Hundreds of seemingly insignificant circumstances can result in a completely different outcome, yet both houses look alike.
Although I have been a cellar owner for many years, I would only build one if it makes no sense otherwise.

Can you add something about the reasons for the basement? So far, it is not clear what benefits it brings you. Are the 500K purely for the house or do they also have to cover outdoor facilities, carport, or similar?

Number of floors: Max. 1 full floor

Which state building code applies? Or rather, which full floor regulation will govern the single-story design here?

Friends of ours are currently building a house without a basement with similar dimensions together with a local general contractor for around 400k.

Note the words "similar" and "currently." They don’t have the final invoice yet. A common solid construction is calculated based on the catalog price, which is proudly quoted, then the upgrade costs, which are talked about with surprise. Then the constant additional costs during the house construction, which you don’t even notice over time. The earthworks are concealed because you still can’t grasp them over the duration of the house construction, and the last bills only come after handover and moving in, or after the owner’s own work. And from moving in on, you don’t calculate anymore because plan B already kicks in.
In the end, you have much more in total than what you initially showed around and you remain silent about further surprises.

Because every square meter costs, here are some questions you should answer for yourself.
Basement, just questioned: what should it serve for?

Windfang

What is it good for?

Staircase not in the dirty area

Then why are you planning the bathroom in the dirty area?

Basement stairs unfortunately not in the vestibule

What should they be able to do better in the vestibule?

Because I don’t reach 170 sqm, but I do 160, and without a basement, I’m already at 480,000.
Regarding the design: yes, the roof slopes upstairs are not taken into account. Utility room on the upper floor is a good idea (that usually saves half a basement).
In the vestibule, I miss a large coat closet, the kitchen with the island is a space eater. Open kitchens with islands are supposed to optimize living space, i.e., save space; here you’re wasting space. In the end, you’ll have a separated kitchen with two doors next to each other: a sliding door you can open and a room door that swings against the opening. Neither fish nor fowl.
I would also arrange the rooms on the ground floor that way.
It’s nice when the children get bright rooms, because they stay in their rooms and have to work there, while bedrooms can do well with a somewhat worse location.