ᐅ Rough Cost Estimate for a House on a Slope

Created on: 18 Feb 2019 20:42
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Scrat72
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Scrat72
18 Feb 2019 20:42
Hello,
we have seen a plot of land for a house and are now considering whether we want/can afford it.
The plot is on a slope, located in North Rhine-Westphalia near the Bergisches Land. There is a preliminary building inquiry for a structure measuring 7 by 10 meters (7x10m) with 2.5 stories. The entire plot is about 400 square meters (4300 square feet) in size.
The land slopes approximately 7 to 8 meters (23 to 26 feet) over a length of around 20 meters (66 feet).
We are trying to get a rough idea of how much the house might cost...
Have I forgotten any important information?
Is it possible to make a (very) rough price estimate based on these details?
Thanks in advance,
Scrat72
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hampshire
18 Feb 2019 23:36
We are currently building in Lindlar on a slope. Site development is being done “from below.” The costs have turned out to be more challenging than the architect initially estimated. Happy to discuss details via private message and/or at the construction site, as I prefer not to share specific numbers publicly.
tomtom7919 Feb 2019 05:19
Over 20m (65.6 feet) there is a height difference of 7-8m (23-26 feet), wow... we have 3 meters (9.8 feet) over the length, and that is already quite a lot. Without a basement, it won’t work at this height, and even then you will need to retain the terrain at least once.
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Scrat72
19 Feb 2019 06:23
Thank you very much for the responses.
We are aware that we need to build a basement there. Also, that the terrain needs to be filled and that everything must then be supported/reinforced. The project is not standard, which is why it is so difficult for us to get a rough price estimate.
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haydee
19 Feb 2019 06:29
Oh, that’s quite something.
There are two stories with a wall built into the slope.

I’d estimate an additional 100,000 for the extra cost of building on a hillside.

Bare wall
Structural engineering (reinforcement, slab thickness)
Earthworks
Excavation waste disposal
Landscaping
Backfilling
Retaining

The outdoor area will need to be shaped at the same time.

Arrange a meeting with a local builder specializing in solid construction and have them explain everything.

Ask yourself if you really want such a steep slope.
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Scrat72
19 Feb 2019 08:22
@haydee:
Thanks, that’s already a rough estimate.
The height difference from the curb to the end of the (planned house) plus about 4–5 meters (for the terrace) is “only” 5.5 m (18 ft). I had imagined placing the ground floor of the house about 1–1.5 m (3–5 ft) below the curb level (then a path from the curb to the entrance) and filling up the rest (including the area for the terrace) to the bottom edge of the basement, so that only the basement walls are partly embedded in the hill.
Your answer also helped me with another question. I was wondering whom I could ask locally for a cost estimate (architect, general contractor...).

@hampshire:
Unfortunately, I can’t send a private message, otherwise I would like to learn more.