Rough cost classification for house on the slope

Tomtom is right, the terrain interception is a significant cost factor. However, it is also possible (almost) without a basement.

Haydee's estimate is roughly what our architect also estimated during the first inspection of the terrain. In practice, we are well over twice that amount with her list – and the outdoor area is not "designed," but merely a gravel driveway is made, though the development and infiltration trench are included.

I respond to the suggestion to reconsider with the outlook. The avatar photo is part of what you can see from the terrace. Another snapshot see below.

Here are some pictures of the project with a slope. On the west side, we have the steepest gradient facing south. The terrain also slopes down to the east, so the western part of the house goes into the slope while the eastern part of the house stands on or above the slope.

Correct in this sketch: the slope at the house. Incorrect is that the terrain continues to rise to the north and that we extended the driveway where the carport is drawn further up. Considering the south view:
On the left and in the middle is the main house (approx. 115 sqm), on the right side are 2 apartments (each approx. 35 sqm) with their own front door for the boys (almost 18/20 at move-in in summer). The utility room is in the middle below the terrace and has the character of a basement.


Below is the west side. What is red here we built as a boulder wall. Everything behind it under the house is not living space but rock (graywacke). The exit from the kitchen is seen here hidden – there is a roughly 3m wide space in front of this door and access to the garden as well as the terrace surrounding the house. To the north, the house can again be exited on ground level.


View to the south:

: I was wondering whom I can ask on site for a cost estimate (architect, contractor...).

If you don't take a contractor but, like us, work with local craft companies, then ask the civil engineer. He was ultimately right and brought us the "bad" news. From then on, the calculation was correct. The soil classes increased the costs somewhat, chiseling rock is more expensive than excavating earth. What's inside becomes visible when you get to it.

Pretty and unusual. One would rather not think about the additional costs compared to the city villa X 185. With a factor of 2, one is probably safe.

@ :
That looks very nice.
The view is always a good argument when located on a slope.
We have a few more good arguments here, but if it exceeds our budget, then not even all the good arguments help anymore. That’s why we try to get as much information as we can beforehand.
But we also know that you are never safe from additional costs.
Then I’ll start looking for an excavation contractor.

We have a slope and the view is no argument for us. We sat down in the valley.

With us was the local construction contractor, who showed the geologist his mental diarrhea, next to my great-uncle. Then we also had a pure civil engineer there. The two companies know every square meter of the mountain and have been building there for generations. They put the structural engineer and the architects in line. Real peace and order then came from the company that did the earthworks, concrete, and masonry work for us.