Plot on a slope in the Munich outskirts - how to decide?

The catch – if you want to put it that way – is that the property is located on a steep slope.

If I stand on the street/property boundary (top edge) and then want to go to the opposite property boundary (bottom edge), it really goes down very steeply (subjectively).

Three meters are planned from the street to the house,

After the dramatic preamble, I probably did not interpret the last point solely as an elevation indication, which would also have explained an offer that was perceived as unexpectedly favorable. In the meantime, it reads by far not so alpine anymore and approaches a storm in a teacup.

Buy!
The slope is not that bad.

4.5 m over 24 m is about 18% slope. That is 1.8 m over 10 m. It’s better not to build a house without a basement / cellar there. What direction does the slope have?

Of course, you could dig down 1 m at the top and fill up 1 m at the bottom. Then the slope is also buildable with a standard house.

I'll bring up the idea of the split-level again. Google "Laux Fertigbau Haus Split-Down." With a house like that, you could build without a basement, and the earthworks on your property would probably be minimal. You have to like split-level houses, though. It also requires a bit more brainpower from the architect ;-) How big do you want your house to be?

By now it hardly reads as alpine anymore and is more like a storm in a teacup.

For me it is less a slope than a bulge. ;-)

First of all, thank you very much for the answers. A few pieces of information from my side:

We had a first meeting over the weekend (about 1.5 hours) with the architect on site (he is also from the town). The conversation went well – I am an amateur, but he gave a down-to-earth and professional impression. Construction is currently taking place next door (the client is also from the town) and he also showed us the house. According to him, there were no problems with the soil/slope here. However, he also clearly stated that building on a slope is always a bit more complex and therefore more costly (but there are also advantages). With regard to the land offer we have and the quite moderate price for the plot, he gave a recommendation to buy. With normal raw material prices, one should be able to manage a solid house (basement/ground floor/attic, garage, and small granny flat) for 600,000 euros.

I then also called the construction company (local family business) that is building the above-mentioned house (they built several houses in the residential area) and asked whether there were any problems with the slope constructions. On the phone, I spoke with the (typically taciturn Bavarian) senior boss. He said there were no problems and he sees no difficulties. The soil consists of clayey soil and some filling has been added on top (does this roughly correspond with the test described below?).

I was also able to have a longer conversation with a neighbor across the street (he has not built on the slope but has lived there for eight years). He said that people with the houses were happy and that there have been no real estate sales in the past – in my opinion a good sign.

In addition, I also had contact last week with the municipality’s site management. They were also very friendly and interested in providing quick information. There is no pressure to decide immediately. From the municipality, I received a soil report (about ten years old). A borehole was drilled about 1-2 meters from the property. Result of the sample (can someone assess whether this is a proper building ground?):

0.40 (topsoil), 1.30 (silt, fine sandy, slightly clayey, brown, stiff, slightly moist), 3.50 (gravel, strongly sandy, strongly silty, brown, medium dense, slightly moist), 5.00 (gravel, strongly sandy, silty, brown, medium dense, slightly moist).

How does all this sound to you? Do you see any pitfalls?

With normal raw material prices one should be able to manage with 600,000 euros for a solid house (basement/ground floor/attic, garage and small granny flat).

The limitation is somewhat concerning. We are currently far from normal raw material prices. I would choose the plot of land. 18% is not that dramatic. However, more information might say exactly the opposite. So without more information, nothing can be said here.