Our floor plan design for an affordable house

What do you mean by building window? Financially? Our budget (I think I already wrote it somewhere at the beginning) is 230,000 € max. Yesterday I also planned some smaller floor plans again. To achieve this, we still need to slim down, I have now planned 135-138 m2. I will post the floor plan variants again later.

What do you mean by building envelope? Financially? Our budget (I think I already wrote it somewhere at the beginning) is €230,000 max. Yesterday I also planned smaller floor plans again. To achieve that, we still need to slim down; I have now planned 135-138 m2. I will post the floor plan options again later.

With the budget, if things go well, it's more like 80 m2 possible and not 135.

What do you mean by Baufenster?

THE Baufenster. No interpretation necessary. The Baufenster is the area on the property where building is allowed. Since it is limited, it is necessary for planning.

...while I bring it up (I thought I read something here about 13 x 14), I look at your site plan on page 1 and wonder why your carport with edge development hasn’t caught our attention. It could be that it is not allowed because a) too much edge development, b) outside of the Baufenster. And now that I am writing this here... Tell me: You want to handle it yourself, but don’t know what das Baufenster is? These are basics a builder should know, even if they have a planner/architect. But if you are doing it yourself, then you should have even more knowledge than the average builder. Just saying! There have been several builders here who overstepped. All of them have disappeared here... no sign of housebuilding!

I do not perceive you now as arrogant, [kotzig] or boastful, and precisely because of that you should take my words seriously.

Dear , I have researched so much. I have spoken with 5 architects and our planner, a civil engineer. No one has ever called the buildable area a building window. It was always referred to as "building lines," "building boundaries," "buildable area," "building restrictions," etc., so I didn’t get the feeling that there is even a standard term for it. Anyway, it’s just a word, and clearly, I have only been dealing with the whole building topic since about October, so please forgive a little ignorance on my part (which is also much less important for the outcome than knowledge about other things).

Thank you for saying I don’t come across as arrogant. However, your (second-to-last) comment does come across a tiny bit condescending to me, which I find a bit unfortunate. I take all tips and concerns seriously; that’s how I even got to planning smaller again. Statements like "if you don’t know that, it won’t work anyway" (that’s kind of how your comment reads) unfortunately don’t help me at all. And they certainly don’t make me want to shelve the project right away. By the way, the real expert is, as I explained in detail in my second post, my father-in-law: a trained plumber, building materials salesman, huge network of craftsmen and professionals, and constantly building himself.

So, I’ve learned something again: you can, quite correctly, take the building window from the site plan in my first post. We won’t have any problem with the carport, here is the corresponding excerpt from the Berlin building regulations:

Garages.and.outbuildings.without.living.rooms.and.fireplaces.and.with.a.wall.height.of.no.more.than.3.meters.may.be.built.without.distance.spaces.also.immediately.on.the.property.boundary..These.buildings.built.on.or.in.direct.proximity.to.the.property.boundary.may.along.their.own.property.boundary.have.a.length.of.9.meters.and.in.total.along.all.property.boundaries.a.length.of.15.meters.should.not.be.exceeded..Thus.garages.or.outbuildings.are.allowed.also.in.corner.situations.at.two.or.more.property.boundaries.

With the budget, if it goes well, more like 80 sqm is possible rather than 135.

That’s what the first architect we saw told us, more or less. But that doesn’t mean it’s not possible. Counterexample: a friend of mine built a city villa with a local general contractor two years ago. 163 m², precast concrete elements, not a bad finish (wood-look tiles, high-quality tiles in the bathrooms, partial brick cladding on the facade, floor-to-ceiling showers, solid wood staircase). They did the painting and installed the interior doors themselves as own contribution. In total, they paid €219,000 for it (I assume without the foundation slab).

Why I think we can manage it is explained quite extensively in my second post, I believe. It is still possible that we will get an additional financial boost from parents/in-laws (my boyfriend is the sole heir of his parents, who also own land in the Berlin outskirts). So for now, no reasons not to pursue the project.

Whoever wants to talk about floor plans again: here I have created some new variants, a bit smaller but still with our preferred, rather straightforward stair shapes. Please feel free to tell me which variant you like best (and why). I’m looking forward to your opinions. (Unfortunately not dimensioned, Roomsketcher doesn’t make that easy, but the furniture is exactly ours and all to scale; wall thicknesses and stairs are also mostly as calculated by the planner, only with the load-bearing walls we are sometimes unsure whether they will be 24 or 17.5 cm thick).

Tell me: You want to touch it yourself but don’t know what das Baufenster is? These are basic knowledge that one should fundamentally have as a builder,

Tell me, you haven’t just been here since yesterday either, shouldn’t one – especially since it was once neatly stated in the opening post here – be able to do something with the note

no development plan (development according to § 34 Building Code)

there is no Baufenster drawn into the development plan because the plan itself as such simply does not exist.

I didn’t get the impression that there was even a standard term for it.

The Baufenster is also "just" a thing, is not mentioned by name in any development plan known to me, and serves in its graphical part only as a reading aid – what matters is its definition in text form, insofar as it does not simply result from the property outline minus setback areas. Thus, here it is sufficiently defined by the definition

[...] Buildings erected on or in immediate proximity to the property boundary may not exceed a length of 9 m along their own property boundary and a total length of 15 m along all property boundaries. [...]

Where there is no development plan, it logically also has no drawn-in "Ga/Cp" special Baufenster.