House placement, exterior layout, hillside location

Hello everyone,
I have bought a plot of land with a slope (not much) (see attachment).
The plot is approximately 25m x 26m x 11.8m x 26.9m.
The building window is 9.6m x 17.00m x 16.25m x 17.7m.

I like a house with external dimensions of about 10.4 m x 10.4 m.

Question 1: with or without a basement
There is about a 2m height difference in the building window. What solution (with or without a basement) is better? According to the calculation from the developer, the usable basement costs about €80,000.
We don’t need much space but do not want to place our house lower than street level.

Question 2: Carport/Outdoor area
At the moment, I prefer the solution without a basement. Now the question arises where to place the carport (and the house). The more I place the house towards the north, the more I have to fill up.

Question 3: How have you handled the outdoor area (carport, garden, filling...) so far? My advisor says that most people take care of it after the house is finished. He suggests I should go to a nursery later (when the house is finished). I think it is much better to take care of the outdoor area now (before the house is built).
I sincerely thank you for your help.

Regarding 1: Don't build a basement if you don't need one.
Regarding 2: Between "filling in" and basement, there is also the open or semi-open variant. Then you have, for example, the sheltered parking space simply under the house instead of a carport.
Regarding 3: Sketch the outdoor area in advance – places to "sit down", paths, sightlines. You can realize this after the construction.

Regarding 1
Do not build with a basement if you do not need one.
You can build with an underground floor in residential quality and place living spaces below. Modern underground floors have nothing to do with dark, damp cellars.
However, timber frame builders often want nothing to do with this. Their part is without ground contact, and that becomes smaller with an underground floor.
For example, in our case, house technology, entrance, cloakroom, kitchen, living, dining are downstairs - as there is access to the garden.
Regarding 2 Hampshire has shown you an option.
Filling up 2 meters simply is expensive and must also be supported.
Regarding 3 a rough planning must be available. The earthworks, digging, filling etc. should be done at the same time. The terrace should already be level and you want to go from the house into the garden.
An access road for trailers and cars, level parking spaces.
In part, it can be done later, but it makes no sense to dispose of excavation now and a year later have fill material brought in.

I can only give you the tip from my own experience to always plan and co-finance the outdoor facilities when building on a slope. Unless you have an extraordinarily high income, saving up or paying from your ongoing salary is almost impossible. In this regard, the advisor wants to lull you into a false sense of security so that you don’t realize how expensive such a slope really is and he can sell his better/more expensive house.

Our development area is on a slope and all the neighbors messed up financially because they underestimated the slope. There were follow-up financings of €30k and more.

with a slope (not much)

there is about 2m height difference within the building envelope

So what is it now?

because they underestimated the slope

Underestimating is bad, definitely take it into account here and plan money accordingly. However, for a 10.4m house, it’s about 80cm here, with a terrace about 1.1m. So even without a basement, it’s unproblematic. Now you have to see where the reference height points for the single-family house are, eaves, ridge (Is that the 215.5m contour line at the southern property boundary?) and where the completed questionnaire is.

So what now?

Underestimating is bad, definitely consider and budget for it here as well. However, for a 10.4m house it is about 80cm here, with a terrace about 1.1m. So even without a basement, no problem. Now you have to see where the height reference points are for the single-family house, eaves, ridge (Is that the 215.5m height line at the southern property boundary?) and where the completed questionnaire is.

I didn’t look at the contour lines exactly now. 2m in the building window sounds substantial at first.

About my neighbors: Well, if the salesperson says: You don’t have a slope or it won’t be that expensive, then exactly what shouldn’t happen, happens.

If it’s really only 1.1m then you can easily do it with a slope and 50x50cm L-shaped stones from the hardware store, if you feel like it.

The most important thing is that the OP has mistrusted the salesperson’s talk and is seeking information here. So all done right. Everything else he has to assess himself.