Single-family house construction project on a slope -> possibilities to secure the slope

ok thanks, my current problem is first of all what options I have to catch the slope. Do they really have to be L stones, or are there cheaper alternatives?

my current problem, however, is first of all what options I have to catch the slope.

just tried to imply to you that you apparently don’t "have to". Your neighbor to the north probably has a little less slope, but your neighbor to the east at least does not support the wall inconspicuously (nothing stands out in the picture) and your previous owner apparently managed without it as well.

From when do I actually need retaining walls? Or rather, when do I have to support the slope?

Theoretically, you might not have to support anything there at all.

When do you have to? As soon as you want to get the property level. You can see it in your sections: the architect tried to make the terrain as straight as possible. You have to decide how you want it. Personally, I wouldn’t care how crooked the terrain in the front yard is. The main thing is that the driveway to the garage is not too steep so that the car doesn’t bottom out.

Yes, I do think it is that linear. Why do you ask?

And by the way, nothing looks linear there, rather gently curved.

If it is gently curved, it could be that the slope mostly lies in the front yard. If you plan that better, you can save yourself a lot of earthworks and retaining walls.

Ah ok, I understand - thank you very much. There has been no house on the property so far, meaning it is undeveloped. :=)

We have an elevation difference from the top left to the bottom right of about 2.90 meters.

Hi, we faced the same problem. At the northeast corner of the planned house including the terrace, there is a height difference of about 160 cm. Since we didn’t want to dig ourselves in and also didn’t want to lose the free view to the rear, we planned the house at least at street level. Due to the soil, 50 cm had to be excavated and backfilled with at least 80 cm of frost protection material. Now we have a height difference of around 180 cm after the earthworks.

The first offers from excavation contractors insisted on pushing a retaining wall on us for at least 10,000 euros. Then we asked a large, reputable local company and they said it was not necessarily required. The architect also only provided it as optional. Now it looks like you can see in the photos. However, we are now wondering how to make the slope of the embankment look nice. There is still 4 meters of space behind the house itself and about 2.5 meters on the elongated slope side.

Good morning Enno, thank you for the detailed feedback. I really think it’s great how you can get help here!!

Yes, when I look at your pictures, I see that it’s exactly the same as with us. Isn’t there a risk that the soil will slip away there? Our architect says that we have to catch exactly that... So in case of heavy rain, etc.? :=)