Floor plan of a flat-roof house on a slope

4. Regarding the "boring" view of the garden: you don’t build a house to watch TV (you can do that somewhere else, too). You build a house, among other reasons, to proudly look into your own garden. Preferably from your favorite spot

Well, I am certainly not representative, but we definitely don’t build our house to look into the garden... rather, to live in it, feel comfortable, and be able to sit IN the garden / on the terrace. At least the latter is true in the OP’s case, and if watching TV belongs to living/feeling comfortable there, then he’s doing everything right ... except for the oil heating and the lack of a controlled residential ventilation system - in my opinion [emoji6]

5. When planning a family, one should consider that many women willing to marry might not necessarily want to move into a finished house that belongs to someone else.

Well, I’m curious about the reasoning [emoji4]

If it pleases and suits one’s own needs? Just on principle? Then that’s probably not the woman willing to marry that a man is looking for [emoji6]

Is it just me, or are you slightly annoyed? [emoji6]

Are there any advantages of a pitched roof over a flat roof? I don't know any.

I don't know, but I could imagine that a pitched roof is cheaper to build. Personally, I just find flat roofs nicer and more practical because you have full ceiling height. However, I also had to/did live 16 years in an attic with a pitched roof, so I understand your points very well.

I simply don't believe the ventilation problem. Just because some "experts" claim that?

It's probably more about building physics than just a claim. But you can also build without it; whether it makes sense for your own situation is something everyone has to decide for themselves.

I would always build with it because a) I would be too lazy to walk through the house every few hours to ventilate and I couldn't guarantee it anyway due to professional reasons. And the fact that today's new buildings are significantly tighter and often no longer ensure the minimum air exchange through infiltration is a fact. The assessment of the relevance for oneself is another matter...

What requirements do I have to meet with an oil heating system? I am planning a Swedish stove in the living room. Do I need solar, photovoltaic, or both?

You need a renewable share for heating or hot water supply. You could integrate your stove into the hot water supply, that should be possible. Otherwise, solar is the classic option, but it isn't cost-effective and takes up space intended for photovoltaic panels. Photovoltaics only count if you directly use their electricity via an electric rod to heat the hot water. Also not economical. But the energy consultant will be able to tell you more about that.

- Gas? Not available

Just for completeness, that also works via tank. If you have a lot of earthworks anyway, maybe something to consider.

The 3X1500L was simply marked by the architect. Nowadays there are modular tanks that you can assemble as you like, without a catch basin. How many I really install will then become clear. They are relatively cheap and of course the price drops significantly with the purchase volume.

For the required amount, that's not a big expense. Whether you fill the 1000L per year for 600 or 500€ ... for the 100€ difference you'll be repaying the tanks for a long time, as well as the space they require.

When I sit on the sofa, I watch TV or similar. But not out on the terrace. Not exciting things happen there

You can tell you’re planning as a single. Sitting on the sofa doing your thing and at the same time keeping an eye on the kids outside offers added value.

5. When planning a family, one should consider that many women who want to get married would not necessarily move into a finished, foreign house.

I agree. Joint nest-building instinct. One usually moves "in with the other." But what can you do? Land available, money available, desire for the project is there ... maybe there are also women attracted by such a cabin. A case for social research.

If I wouldn’t "put up with" it or find it cozy, would I then plan it that way? I don’t quite understand. Are there any advantages of a pitched roof over a flat roof? I don’t know any. I simply don’t believe in the ventilation problem. Just because some "experts" claim it? I won’t say anything about point 5.

At least there is no significant advantage of a flat roof compared to a pitched roof.

It is not uncommon that one communicates their ideas to the architect, but the design does not correspond to them. Since an architect has designed something impressive, one often accepts it. The architect costs money and must know what they’re doing. One quickly forgets that as a client one actually had quite different ideas for their house.

This design is certainly not exactly the "cozy version" of a single-family house as you apparently envisioned it.

And thus my question has its justification to be addressed to you.

Regarding the topic of controlled residential ventilation: the thermal envelope of a house is airtight. Rooms need to be ventilated, otherwise they smell stale. There are no "expert opinions" about that, it is simply so. I have deliberately _not_ addressed the topic of mold and I do not intend to do so here either.

I have the feeling that you do not want to read criticism or comments.

There is at least no significant advantage of a flat roof compared to a pitched roof.

Hello Yvonne, don't you think that with the same number of floors, the partition walls lost due to roof slopes represent a limitation and could be seen as a potential disadvantage? Or do you mainly mean these flat, 13 to 25 degree pitched roofs with a 2.20 knee wall when you say pitched roof?

I have the feeling that you do not want to read any criticism or comments.

Understandable feeling...

Of course, flat roofs have advantages. [Staffelgeschoss], use as a terrace, quiet, cool, and simple in construction. Wood-free = rot-free. Storms are not an issue. As long as it is kept watertight, I would also describe it as durable. And appearance is a matter of taste.