Hello,
I have always had the feeling that special requests are expensive. Since such a roof shape is not common, I thought it would be more expensive. But if that is wrong, all the better
If I were you, I wouldn’t rely on €uro’s statement; he is an MEP planner.
You have to distinguish (learn). There are providers – both in prefabricated and solid construction – who offer standardized floor plans. Even the smallest changes/extensions to the desired house lead to a cost explosion. Aside from that, not every provider can deviate from their standard because they simply lack the personnel (draftsman or even architect/structural engineer) for it. They bought a house program including structural calculations once and have to work with it if they want to keep costs low.
On the other hand, there are providers – including us – who have architects in-house; for these, it is ultimately completely irrelevant what the finished house looks like after planning is completed. The structural analysis is calculated only after the submission of the approved structural calculations. It goes without saying that no load-bearing functions should then be changed, since otherwise the structural calculations have to be redone.
I think there is consensus – at least here in the forum – that simple architecture is cheaper to realize than, for example, a round house. I can tell you from my own experience that then concrete workers, facade builders, and also plasterers "go crazy"; it gets quite expensive as a result.
What you envision as architecture I would not summarize under the title "special requests." In the first step, you want to implement what appears as an idea in your head as images for the new building. Whether it is feasible, you will know quickly once the development plan is clarified and the first offers are available. But you can assume that it will be more expensive than the standard single-family house with a classic gable roof at 38-42°. And not because you have to calculate "special requests," but simply because you are choosing a different type of roof construction for the new building.
And finally – "special requests" are, for example, the aforementioned round building, two-level buildings (split level), or a "Philippe Starck® bathroom series." But these are all snapshots that are subject to societal change; years ago, Villeroy & Boch® bathroom series were considered luxury, today they belong to the standard of reputable providers.
Rhineland regards