rough site planning 819m²

I need to be able to work there both in summer and winter! Is a 30° roof pitch enough for an office, playroom, and large storage room?

My wife and I just want the family life to take place on one level.

I don’t understand a word. No one said anything about banishing the children, nor are family members dying like flies in the attic of their house. You act as if no one can be expected to live or sleep on the upper floor. This is simply about a single-family house where everyone then also has the right to privacy and a retreat, because that is the purpose of a home. In general, family life then also takes place on one level.

I don’t understand anything. No one said anything about banishing the children, nor are the family members dying like blowflies in the attic of their house. You act as if no one can be expected to live or sleep in the upper floor. This is simply about a single-family house, where everyone also has the right to privacy and a place of retreat, because that is the purpose of a home. Generally, family life also takes place on one level.

Please remain factual. As I said, my dad is currently converting the attic and a lot of warm air comes from the attic into the ground floor. What I didn’t say is that I sometimes sit 40 hours or more a week in the study. I should be able to expect reasonably normal temperatures there.

The same temperatures prevail throughout the entire house. And since we advise against building a bungalow, the matter of an extension is unnecessary.

Please stay objective. As I said, my dad is currently converting the attic and a lot of warm air is coming from the attic into the ground floor.

How far along is he already? The warmth or cold in the house can be planned very well in a new build. Therefore, giving up a floor on a rather average-sized plot is questionable. See it this way: You build a huuuge roof and don’t use the space underneath. It’s simply a cost/benefit issue. Moreover, you lose the valuable space in the plot. What is drawn in the original post, you can do. But in my opinion, there are some drawbacks: The bright hallway overlooking the terrace would be gone. Instead, it’s rather dark – you would need skylights (double casement windows) there – but the effect is lost. Also, the location of the office is obviously unsuitable. And if it faces south, it definitely won’t be cooler than under the roof.

About the attic conversion.
Don’t compare older buildings with new ones.
The heat no longer comes through lack of insulation, but through window openings. Double-wing windows often don’t have blinds, which is why people like to plan with a gable where real windows with shutters can be realized.
A house needs a roof anyway, so put the basement replacement in the attic, but consistently with office, gym room, and storage options. This consistency requires a planned staircase.
There are now enough hybrid houses that provide half the upper floor as fully functional living space.

The whole house has the same temperatures.
And since we advise against building a bungalow, the issue with an expansion becomes unnecessary.

Okay, so the variant 4-room bungalow and office in the attic would also be out for you?

How far along is it already?

You can plan the heat or cold in the house very well with a new build. That’s why foregoing one floor on a rather average-sized plot is questionable. Look at it this way: You build a huuuge roof and don’t use the area under it. That is simply a cost/benefit question. You also lose valuable space on the plot.

What is drawn in the initial post you can do. But in my opinion, there are some drawbacks: The bright hallway with a view of the terrace would then be gone. Instead, it is rather dark – you would then need skylights (double-wing windows) – but the effect is lost. Also, the location of the office is of course inappropriate. And if it is on the south side, it definitely won’t be cooler than under the roof.

It isn’t very far along yet. The stairs arrived two weeks ago. I believe not much else has happened.

Yes, I have already considered the cost/benefit question. Losing valuable space on the plot is (at least for now) not so important to me. I don’t want to add anything but only want lawn space. For the children, you can certainly set up some nice things on the plot. Trampoline, swimming pool, climbing frame, etc. That takes up space and argues in favor of the villa.

Regarding the darkness in the hallway, you could certainly position the windows in the dining area better. Then the hallway would not be so dark. Also, I could use one of the children’s rooms as an office. The one next to the utility room would be well suited. Then the terrace would become the children’s room. Overall, it would be a huge bungalow.

I think it makes sense if I think it over again calmly.

Okay, so the variant 4-room bungalow and office in the attic would also be out for you?

Yes! Any bungalow is out!

Yes, I have already asked myself the cost/benefit question. Losing valuable space on the property is (at least for now) not so important to me. I don’t want to build anything, just have lawn area. For the children, you can surely put up some nice things on the property. Trampoline, swimming pool, climbing frame etc. That takes up space and speaks in favor of the villa.

yes... right now none of that is important. Maybe think a bit more future-oriented, and not just from one day to the next.

I think it makes sense if I think it over again calmly.

Certainly!