Cost issue for earthworks on a slope

I don’t understand why the OP doesn’t even post a dimension of the property here. That way, one could help better. I already have my idea. But I’m not posting anything here blindly.

Here are a few more pieces of information. A distance of 3 meters from the property boundary must be maintained, but garages/carports may be adjacent to the boundary. Based on the data available to me, a house measuring 10 x 12 meters would fit.

The most important cost factors for earthworks when building on a slope are these: 1. Soil characteristics. There are soil classes and they differ in how "expensive" they are to work with. A soil survey can give you some information about the soil conditions. A major cost factor is always when you can no longer excavate but must chisel instead. Sometimes a larger underground boulder alone can significantly influence construction costs. What is not visible is a cost risk and you bear that. 2. Architecture. You can build with the slope or against the slope. Basement rooms on a slope are advantageous since they will at least get light from one side. This makes a basement comparatively inexpensive. Building a bungalow on a slab foundation in a slope, on the other hand, is comparatively expensive. If you know and accept this when planning, it is no problem. 3. Where to put the excavated material. It is inexpensive to integrate the excavated material into the garden and property landscaping. On your property, you will hardly avoid having some truckloads transported away. Simply put: more truck trips mean higher cost. As long as you don’t have a plan for a house, no one can tell you what the earthworks will cost and the indicated range goes from surprisingly cheap to moderately careless. With influence on the architecture and with the terrain design, you have quite a bit in your own hands. Since there is no calculable certainty in advance, I would allocate an amount in the upper third of the range, e.g. €75,000, in the decision phase for the property and house and check feasibility. It is quite possible that you will manage with considerably less, which will give you some breathing room in your financial plan. If you threaten to drive yourself into financial trouble with it, you know what risk you are taking.

The Rhinelander has known for centuries... Et kütt, wie et kütt. It comes as it comes... and it costs what it costs.

Of course, you can already get a feel from the neighbors about what their soil report showed, that gives a rough idea. But you only have 100% certainty when the excavator comes and digs deep.

And slope, even a slight slope, even if you plan the house with the slope. You have to remove soil that you can't use. Because usually, you can't use the stuff from deeper layers for the garden and you will have too much soil, silt, clay, or something else anyway.

And even when the house stands. For your outdoor areas, it applies... catch, catch, steps, catch... I have a good 1m height difference on a 35m property and am planning a stepped garden with 2 steps for that. For this, I have to install around 50m of palisades, including frost protection, foundation, etc.

You have 2, 3m, that will be expensive. If not at the house, then in the garden.

As already mentioned: the quality of the soil is quickly determined. If I were you, I would rather think about the intended size of the house, location, and the location of the garage. You can already see from your neighbor how elaborate his planning is. The neighbor further up seems to have a flatter plot.

I do not see your desired house with the angle like that for the moment. The basic idea here is still the need for the house: how many people, how old the children, the needs of the occupants, number of parking spaces (requirement of the state building code). Budget. The building window is not generous, 3 meters to the south, and in the west, you also cannot have a large area for a piece of garden. That is primarily in the north. But that can be lived with well if you plan south and west-facing windows. A garage would be possible in the west; then it would lie further up. If the entrance is also taken there, it results in a living floor there and downward (house runs toward the east) then a basement for the bedrooms. However, you can also recess the garage into the west, with a bit of garden area above the width of the garage. That results in an entrance floor on the ground floor but also with bedrooms. Above that, the living floor with a north-facing garden. You get the same if you make the driveway from the east. Then the garage is on the ground floor without (or with little) excavation, and the house extends again into the upper floor with the living rooms. The latter would be the most natural and earthwork-wise the cheapest option. The remaining soil for the basement, which would have to be removed, can be used next to the garage (then north) for embankment to get a level garden area or a shallow slope down. The children's rooms would then be in the south/east in the basement, fully functional. North basement would be the technical area and storage room. I already see the allowed overrun of one meter of the ground area as practically necessary.