ᐅ Conversion of existing ground floor apartment – additional office space

Hello everyone,
I am taking over my parents' apartment and now want to start the renovation. Unfortunately, the apartment has one room too few for my needs (in this case, a small office).
I would like to gather ideas here on whether it is possible to redesign or structurally modify the dining room / living room / kitchen areas so that a small office can be created.
Costs are not important at the moment; what matters is if there is a practical solution:

Client Requirements
Number of people, age: 2 adults in their late 30s, child planned
Office: Home office?
Open or closed layout: rather open
Modern construction style
Open kitchen, kitchen island: Yes, if possible
Number of dining seats: 4-6
Fireplace: Yes. Should be in the living room, currently in the dining room

House Design
Designed by:
- Architect: from 1985, no data available anymore
What do you particularly like? Why? Large living room, rear area well designed (bedroom, bathroom, utility room)
What do you dislike? Why? Huge dining room as a separate area, like a large hallway; one room too few available

Why is the design the way it is?
For example:
Built in 1985, parents decided on the layout

What is the most important/basic question about the floor plan summarized in 130 characters?

How can I create an additional room as an office (approx. 10-12sqm (108-130 sq ft)) from the existing floor plan?

bruzzler schrieb:

How can I create an additional room for an office (about 10-12m² (108-130 sq ft)) from the existing floor plan?

bruzzler schrieb:

Costs don’t matter for now; the important thing is whether there is a practical option:

Then plan the entire floor plan with an architect and a structural engineer according to your needs. Otherwise, you will have a problem trying to simply "cut off" around 10m² (108 sq ft) somewhere. Wouldn’t a small desk in the hallway or bedroom be enough? I don’t know your requirements, but for my home office (about 80% of my working time) that would be sufficient. Alternatively, you could move into the children’s room for a few years.

bruzzler schrieb:

I am allowed to take over my parents' apartment

Doesn't that look like a house?!?
Is there an attic that could be converted? Where does the staircase lead?
If you open up the kitchen, dining, and living room, a small workspace could be created.

nordanney schrieb:

Then redesign the entire floor plan with an architect and a structural engineer according to your needs. Otherwise, you’ll have a problem cutting off 10 square meters (108 square feet) somewhere.
Isn’t a small desk in the hallway or bedroom enough? I don’t know your needs, but for my home office (about 80% of my working time) that would be sufficient. Alternatively, move into the children's room for a few years.

Thank you for your reply. The office definitely needs to be a separate room, if only for tax reasons and because I need quiet as I do programming.
I asked an architect, and he suggested moving the door to the current hallway to the left, so that a narrow corridor would lead from next to the kitchen to the back hallway, and the current dining room would become the new office.
However, I’m not entirely happy with that solution.

ypg schrieb:

That looks like a house, doesn’t it?!
Is there an attic that could be converted? Where does the staircase lead?
If you open up the kitchen, dining, and living areas, a small work nook could be created.

Yes, it is a house, but the parents are already moving into the upper apartment. So I only have the lower floor.
What do you mean by "open up"? If I understand you correctly, that would be a work nook without a window, right? I definitely need a separate room as an office.

bruzzler schrieb:

I asked an architect, and he suggested moving the door to the current hallway to the left, creating a narrow corridor next to the kitchen that leads to the hallway at the back, and turning the current dining room into the new "office."
However, I'm not completely satisfied with this solution.

If you look at the floor plan and your requirement that you need a whole separate room, there is no alternative. With this layout, you cannot add an extra room—only repurpose the existing rooms. Essentially, it's dining or working, child's room or working, bedroom or working.
The least unpleasant option is to work in the bedroom.