Floor plan design for a passive single-family house ground floor

I wonder where I’m supposed to store things if I, for example, take away the storage room... There is no basement, no attic... If I imagine, I currently have a small basement in my apartment, about 10m², which is more or less full, ranging from suitcases to drink crates to Christmas decorations...

In the bedroom, there is more than 2.5m of space behind the door for a wardrobe, that would be a 5-door Pax for example. How much should I plan for here?

.....
Regarding the budget, I plan to do a lot myself, either completely finish it myself or maybe even as a kit... I have the plot and it is debt-free.
I think the house should cost around 25,000, roughly, I will finance the ....

You’re not the first to build without a basement and DB. Organization and good planning are everything.
For example, a standard 3-meter wardrobe in the bedroom so you can store bed linen and towels etc. there.
Many women need at least 2 running meters anyway.
That’s why it’s common to also plan 3 meters of wardrobe space in the utility room. Also for decorations. Additional miscellaneous stuff can go into cupboards in the TK as well as an efficient room, but not one that extends into the living room, has no natural lighting, etc. Not everything has to be implemented now, but you should plan one thing or another in the house design. You don’t at least build a house to store old loads. But everything is possible if you build accordingly. You already have a nice cloakroom.

Regarding the budget:
Calculate roughly 2000/sqm for living space plus 50,000 incidental construction costs (hillside plots cost money)
Plus exterior facilities.

You can deduct 20,000 for your own labor if you want, but you will only be able to do your own labor in addition to your job, so the working time is limited to a few hours/week. As an application developer, you also won’t have construction experience, and you’re not the youngest anymore either.... [emoji6] So everything will take a bit longer, which means if you finance, you will have double costs.
In the end, you’ll save little, except on health [emoji6]

May I ask where you are building? Hamburg or Lower Saxony?

Already have... LK Harburg... Tostedt municipality :)

I will build in Lower Saxony, in the Nordheide...

I have some construction experience; as a student, I worked on construction sites for several years on the side. In addition, my grandfather was an electrician, and I have enjoyed helping out here since childhood. My grandfather built his entire house with his own hands, that would be my dream, but it is of course more than unrealistic. However, I am generally not unfamiliar with activities ranging from bricklaying walls to drywall construction to installation and electrical work...

For professional and time reasons, I will have to plan self-performance to a realistic extent, although I would indeed consider switching to part-time temporarily during the construction period to have enough time for the building.

I just noticed that a 0 is missing in the costs in my statement... so I'm roughly calculating with 250,000 not 25,000 :D

For professional and time reasons, I will have to plan my own work effort at a realistic level, even though I would seriously consider going part-time for the construction period to have enough time for the build.

Have you ever calculated how long you would go part-time for that, how much salary it would cost you, and whether you might even end up losing out because of it?

You mentioned in your initial thread that the building regulations from 1962 apply. I completely overlooked that. Unfortunately, I don't have the leisure to read through everything. Your interpretations are probably correct [emoji4] If necessary, the architect will tell you the right thing and hopefully also design something functional and nice [emoji4] Or do you want to do without one as well? Are you calculating your 250,000 with or without the additional costs?