ᐅ Backfill slope / connect first-floor terrace with garden

Hello,
I have a question for the experts here.
I am planning a loft conversion and, of course, also a terrace with garden access. The “problem” is the height; the terrace is about 3.10 meters (10 feet 2 inches) high. The length is approximately 6 meters (20 feet). Is it at all realistic or affordable to add fill to such a large height? I have plenty of space available due to the slope, so that wouldn’t be an issue. In the attached photos, you can see the current state as well as the planned future house.
Having direct access to the garden is very important to me.

Option No. 2: I don’t make the terrace level with the door, but instead go down a step or two before the terrace. That way, I gain about 50 cm (20 inches) and would need less fill. But I suppose that doesn’t really make much difference, does it?

I look forward to your opinions.
Best regards, Andreas

Converting an agricultural building where the stables become a ground-level basement is misleadingly described as an "attic conversion."

Getting useful advice here is directly linked to providing more than just partial insights into your project.

dahigi schrieb:
Having direct garden access is very important to me.

“Direct garden access” via a sledding ramp?

At this point, is your approach to planning still humorous or already a sign of inexperience in translating plans into construction?

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The "stables" have been empty for decades and have been converted into storage and a workshop, and are partly occupied, so I don’t think the term "attic conversion" is entirely wrong in this case...

The "sledding hill" could of course be planted and fitted with steps.

Sorry that I’m not describing or explaining the conversion itself in detail right now; as I said, I’m more interested in the earthworks and how realistic or affordable something like that is.

And yes, sir, I am serious!

If you want to use a robotic lawn mower, the maximum slope should be 40%. That would be 8 meters (26 feet) of incline.
Filling material
Transport
Excavator
Compaction
Retaining wall on the left and right.
Structural engineering
Can the old wall withstand the pressure? For a 3.10-meter (10 feet) slope, you would need a massive retaining wall with a lot of steel reinforcement, not a regular stable wall.

I have my doubts that something like this would be approved.

Why don’t you build a large balcony with a spiral staircase into the garden instead?

Just convert your driveway silo into a garage and instead of a slope on the right side, create terraces with intermediate stairs. You can gently slope them down toward the front at the "garage entrance."

Thank you all for your ideas and opinions. @vgbau, your idea also sounds very interesting! Thanks! Best regards