Floor plan design of a semi-detached house 115 m² for a family of 3

Hello everyone,

we are currently in contact with a property developer because we would like to sell our current house and build a new one. The current house is an extension, has 140 m², but is almost 40 years old.
In the newly developing residential area, mainly semi-detached houses are being built, which we can very well imagine as a small family.
Here is the completed questionnaire for now:

Bebauungsplan/Einschränkungen
Plot size: 330 m² (11 x 33 meters)
Slope: no
Floor area ratio: 0.25
Plot ratio: -
Building window, building line and boundary: 3 meters to the property boundary
Edge development: permitted up to 3 meters height
Number of parking spaces: 2
Number of floors: 1 + recessed story
Roof shape: gable roof
Style: modern, timeless
Orientation: see floor plan
Maximum heights/limits: upper edge of structural installations max. 7 meters

Anforderungen der Bauherren
Style, roof shape, building type: semi-detached house with gable roof
Basement, floors: no basement, 2 floors
Number of persons, age: 2 adults (37 & 36), 1 toddler (should remain one child)
Room requirements on ground and upper floor: total 115 m²
Office: family use or home office? Both occasionally home office, possibly 2nd workspace?
Sleep guests per year: 0
Open or closed architecture: open
Conservative or modern construction: -
Open kitchen, cooking island: open kitchen with peninsula
Number of dining seats: 6-8
Fireplace: -
Music/stereo wall: -
Balcony, roof terrace: -
Garage, carport: -
Utility garden, greenhouse: currently not planned

The furniture drawn in our self-designed floor plan is currently available and we would take it with us at first.

Hausentwurf
Who designed the plan:
- planner from a construction company
- do-it-yourself
What do we particularly like? Why? The large living/dining area with open kitchen, many windows on the ground floor for brightness
What do we not like? Why? On the original floor plan: the open staircase, children’s room too small, arrangement of parking spaces, lack of storage space, utility room too small
On our self-designed floor plan: the problematic arrangement of sofa/TV and dining table
Price estimate according to architect/planner: €389,000 (special requests such as additional windows and further changes not yet considered)
Personal price limit for the house, including equipment: €450,000
Preferred heating technology: heat pump with preparation for photovoltaics

If you have to do without, which details/extensions
- can you do without: -
- cannot do without: -

Why did the design turn out the way it is now?
Our self-designed floor plan has more storage space and we like the arrangement and size of the rooms on the upper floor better.

As already mentioned, we are not yet completely happy with the ground floor or don’t know how best to arrange our furniture.
The staircase takes up less space in our plan now, but it is still not clear whether we are allowed to change the shape of the staircase.
We definitely want a staircase located in the hallway and separated from the living/dining area, as we currently have an open staircase and don’t like that due to the noise.
Maybe you have ideas on how the staircase can be integrated differently.
According to the developer, we can currently still make changes to the floor plan, but to what extent will have to be clarified tomorrow (appointment with the developer).
Originally, for example, the utility room was planned in the west, which is not ideal.
The topic of storage space still gives us some headaches. Even if the utility room now has more space and we would also like to have a small storage room under the stairs as drawn.
Maybe a bit of the children’s room could be cut off for another storage room on the upper floor? The room is actually already too large now...
We have also not yet considered the issue of a second workspace in case my husband and I are both working from home at the same time.
Because of the low floor area ratio, the topic of outdoor facilities is also not so easy. We do not like the arrangement of the parking spaces one behind the other and would rather place both in front of the house.
However, we would then have to do without the carport, which is not so important at the moment since it would be a special request.

Do you have any ideas how these points can be implemented or how the floor plan could be changed to meet our wishes?
I know that the possibilities are limited on 115 m².

Many thanks!

The living-dining area in your design will feel like a studio apartment, as cramped as everything is in one room.

Yes, exactly that is what we also see as a problem... but how could this large room be better utilized and divided?

How about something like this? Or can the kitchen only be built in the corner?

How about something like this? Or can the kitchen only be built in the corner?

Oh, wow, I really like that already. Thank you very much!

Hello,
yes, I know the draft.
The problem is simply that many things no longer work properly. First of all the staircase, which affects everything: it is below standard, so very difficult to use and therefore prone to danger. If you take a look here:
https://www.hausbau-forum.de/threads/grundriss-planung-unbedingt-vor-beitrag-erstellung-lesen.11714/

at the very bottom, there are the minimum target dimensions. And yes, if you are tall and accept it, you can build with 200 x 220, but you compress the staircase to 189 x 175. That is simply just steep, the steps narrow... and since they taper, very dangerous. You would get annoyed every day. I don’t even know if that still counts as an emergency exit. Because an AB is supposed to be underneath, you will enclose the staircase with walls. Thus, you will hardly be able to get furniture or a ladder upstairs.

Your kitchen is not functional. Your tall cabinets are not 60 cm wide. For two tall units for fridge and oven/food, you have to plan 130 cm, for three 190 cm; a cooking island should be 90 cm deep so that splashing grease stays on the surface and doesn’t splash behind onto the floor.
With 6 meters width, dividing the open-plan living area into two main areas is simply stupid. Basically hardly anything works on the ground floor except guest WC, hallway, and utility room.
Similarly on the upper floor: the bathroom works for 1-2 people together. Your bedroom is compressed so much that the door bumps into the wardrobe. You possibly cannot place a 60 cm cabinet in the door area because it otherwise blocks the door hinge.
Furthermore, your dimensions don’t match? At least you plan with dimensions that are not congruent with the original plan.

Basically, you can halve the WC, no one will complain about that. And you should forget about a 10 sqm hallway in a 115 sqm semi-detached house. Nice niche/cupboard in the hallway, but no large extra niche.
It is quite clear that you cannot expect miracles from the space. But you should also submit to what you have available and make the best of it. Placing the staircase entrance into the hallway strains other things. Maybe it can still work in the coming days (I will try), but it has the consequence that the staircase must begin further towards the top of the plan and thus the main room cannot be zoned nicely.
I would then place the kitchen along the long central wall.

I have the impression that you are not impressed by the specifications and comments now and are clinging desperately to your draft without seeing that it is also not worth being built?!

But you were aware when signing that there is a lack of storage space, even without an attic?