When is a slope a slope? Basement vs. slab

Great, thanks for the quick reply. I like it.

Are you sure you want to be 0.5m above the street? I'm glad it almost didn't happen here by chance

We are fairly sure. A step to the front door is already planned anyway, and then it would be roughly 33 cm left. This is spread over 8m of yard, which corresponds to a slope of about 4%. That's okay. If we were to set the house even lower, it would just be further in the ground at the back.

At the back, where a terrace is supposed to go, we will create a plateau up to the boundary or leave a slope just before the boundary, or work with retaining walls. If you have everything excavated to the back, wouldn't you soon have to come out on the turf again due to the slope?

Yes, but that doesn't really help me since I'm trying to have as little excavation as possible.

If you had a small slope upwards behind the terrace again, there is a risk that rainwater would collect on the terrace, which I would avoid; it's better if the water can continue to drain away

Yes, that's true. From the end of the terrace to the end of the property, I only have 4m anyway. So I can also have 3m excavated right away and build a sort of embankment on the last meter that I then plant, which would also serve as a privacy screen for the neighbor.

Basement or floor slab. When considering this, I would strike out basement and make it a lower floor. "Basements" can be equivalent (dry, bright, airy) living space with an appropriate slope location. The house has one more floor and the footprint can be smaller. Every cubic meter of excavation costs, as does filling and compacting. Retaining walls, slope stabilization, etc. cost money. When I see the tons of steel embedded in the slope wall and in the floor slab here just to keep the structural engineer sleeping peacefully. The garden wall for slope support would have to have similar dimensions.