ᐅ Retaining a Slope and Backfilling – Additional Costs?

Created on: 26 May 2020 22:01
T
Thirteen
Hello dear forum,

We recently managed to secure a building plot and are now slowly but surely moving into the detailed planning phase.

Our plot has a total slope of 4m (13 feet), with 2m (6.5 feet) within the buildable area. So we almost have the choice: basement or no basement.
If we decide against a basement, higher costs for filling and slope stabilization will arise. The question is: what additional costs should we realistically expect?

We are also currently considering a basement. It doesn't really fit into the budget, but we would consider it if the costs for filling and stabilization are very high. And here again the question: a utility basement with partial heating or a living basement that could possibly be rented out. But that would probably also generate significant additional costs.

Opinions on costs vary here as well. So far, we have been quoted prices ranging from 60,000 to 100,000 euros. What would be realistic?

Our plot is located in a new development area, for which a soil report exists. This report does not indicate any special issues. We will obtain a soil report specific to our plot once we know exactly who we will build with.
Of course, we could also wait until that report is available and then decide, but in fact our choice of builder also depends on the decision about the basement.

I would be happy to receive tips and opinions from you.

Thank you very much!
E
Escroda
28 May 2020 10:20
haydee schrieb:

Garage and building services, entrance, and 2 rooms in the basement

The disadvantage here is that the lowest ground levels are located to the north. The garage or carport can only be placed where the ground is lowest. Here is the elevation situation using the example of a house measuring 9.50m (31 feet) by 11.00m (36 feet) and a garage measuring 6.00m (20 feet) by 4.00m (13 feet):

Site plan: two orange buildings, blue outline, red coordinates, street/path, north arrow.

For other proposals, here is the site plan without any design (scale 1:100):

Site plan: street outline with plot, blue dashed square, north arrow.
T
Thirteen
29 May 2020 08:25
We had a very productive consultation yesterday. The plan includes a basement as the lower ground floor. The garage will be located on the west side of the house and will also serve as an additional terrace. At least, that is the plan. We will see what the final cost ends up being.
H
haydee
29 May 2020 08:27
Keep searching in parallel.
E
Escroda
29 May 2020 08:48
Thirteen schrieb:

The garage will be on the west side

Since the plot is rotated almost 45° off north, you don’t really have a west side. Please show the site plan.
Thirteen schrieb:

will then serve as an additional terrace.

In that case, it must comply with setback requirements. And where are the basement-level windows located then?
T
Thirteen
29 May 2020 08:57
I marked the area of the garage and terrace.
The basement windows will be large and face the street at the front (which is the case with every basement variant).

Stadtplan mit farbig markierten Bauzonen WA 1/WA 2, Grünflächen, Wegen und Flur 18 und Flur 23.
H
haydee
29 May 2020 09:34
Well, it is possible. I’m not a fan of roof terraces.
Advantage
The slope is supported in that area
Many rooms with windows in the basement
Disadvantage
Probably more costly than Escroda’s suggestions. But it depends on the overall concept.