Bungalow 148m² site planning / floor plan planning

Guest bathroom????? You're not serious? The guests stay downstairs after all.

Guest toilet????? You're not serious? The guests stay downstairs.

Yes, I understand that the guests stay downstairs. I also don't think it's good if it's upstairs. But for us, that's still better than putting the children's rooms upstairs.

Then only the utility room, although the washing machine and dryer have to stay downstairs.

If I cut off half (or so) below the ridge,

Nothing is cut off there. My recommendation for the construction of a "offset shed roof" is to place the "ridge purlin" over a wall offset from the central axis, which automatically creates an offset and a ridge gable (which I, by the way, suggest to be classically glazed instead of "modern" blind) in combination with equal slopes on both sides. The other two construction methods would be b) different slopes (with the analogy of different usability), or c) different eave heights (which, without a corresponding split level, look like crooked hips).

A guest WC and utility room could go upstairs from our point of view.

Guest WC no, rejected due to pointlessness
Utility room surprises me: You had expressed fear of every multi-meter pipe in front of the meter. Does that not apply to vertical meters?

Nothing is being cut off. My recommendation for the construction of a "offset shed roof" is to place the "ridge beam" over a wall offset from the center axis; this automatically creates an offset and a ridge end (which I suggest classically windowed, by the way, instead of "modern" blind) in combination with equal slopes on both sides. The other two construction methods would be b) different slopes (with the analogy of different usability), or c) different eave heights (which without a corresponding split level look like uneven hips).

Guest WC no, rejected due to pointlessness
Utility room surprises me: You expressed fear of every multi-meter pipe before the meter. Does that not apply for height meters?

Yes, the concerns came from me. Unfortunately, I cannot estimate how high the additional costs are.

Nothing is cut off there. My recommendation for constructing an "offset shed roof" is to place the "ridge beam" over a wall offset from the center axis, which in combination with equal slopes on both sides "automatically" creates an offset and a ridge gable (which I, by the way, suggest to be classically glazed, instead of "modern" blind).

I thought the goal was to only have to expand half of the roof, due to lack of money. What you're planning is more like "beautification-noch-cheaper-gimmick." But right, why suddenly a shed is in demand, I haven't yet read the real reason from the OP.

I thought the goal was to only have to convert half of the roof because of lack of money. What you are planning is rather just "beautification-more expensive-gimmicks." But right, I haven't yet read the real reason from the OP why a shed roof is suddenly preferred.

The idea with the staggered shed roof came from this forum. Therefore, I have been thinking about it.