Plot on a slope; embankment - retaining - costs?

Hello,

Since the street rises from the neighbor to "our" property, namely about 60cm, and we would build the knee wall lower, we would gain about 1m and thus be about 1m higher than the neighbors.

I don’t understand this calculation...

I assume that the 7.70 from the top edge of the street applies at the lowest point in front of the house. At least that is the case with the neighbor’s building according to the section. The street rises towards us by about 60 cm.

As a rule, the average counts. As soon as the preliminary site plan is available, you will have 3 height indications in front of your property. If the specified finished floor height refers to the street, your planner must calculate the average of these values and you will have a reliable reference point. If the indication refers to the top edge of the floor slab, the situation looks different; however, this should be clarified at the building authority if it is not stated in the textual regulations for the property.

Of course, a (partial) basement is planned.

Why "of course"? Are you aware that a partial basement is almost as expensive as a full basement? And with the upcoming earthworks, a full basement certainly makes sense. Have you asked the resident of the existing semi-detached house about the soil conditions? Then at least you have an approximate value, although the soil conditions of your property can certainly be different.

Rhenish regards

Well, paying 800 - 1000 euros for something where you eventually know that the construction will be too expensive already saves you something. We had also planned the €15,000 for something else than to sink a lot of gravel under our house.

But if it ends up being around €30,000, then these 1000 euros are actually peanuts.

Hello,

originally, everything is measured from the reference level NN. And the "original" terrain profile is also surveyed based on NN. That is why I wrote about 3 indications of the elevation, in front of your property; to be taken from the preliminary site plan.

Personally, I consider the costs for a soil survey to be justifiable; even if it only shows that building on the property would exceed your budget! Your neighbor talks about clay soil, so have your provider/civil engineer prepare a rough estimate of the expected additional costs based on that. If you can live with that "and" still have a reserve for any possible additional foundation costs, then some security is present.

Rhenish regards

So. The neighboring house (i.e. the second semi-detached house) is 7.70m high, according to the plan measured from the street level at the lowest point of the street in front of the house, that is, on the far right from the front view. We want to set the ground floor as high as possible, in order to 1. not have to "climb" down so far from the street and 2. to have the garden and terrace as high up as possible.
The street rises by about 60 cm from the right corner of the neighboring house to the imaginary right corner of "our" house. I assume that from this point on we are allowed to plan a ridge height of 7.70m (but I will inquire!). Thus, our house would already stand 60 cm higher than that of the neighbors. Since the neighbors have a knee wall of 1.30m, we would set ours at 90cm. This way the roof and thus the ridge would shift down by 40 cm. We could then raise the whole house by those 40 cm. That way we would have 40 cm + 60 cm = 100 cm, meaning our house would be 1m higher than the neighbors’.

We have an appointment with the home builder on Thursday and have already inquired with the authorities about the conditions of the property and the development plan; we are still awaiting a response.

By "of course" building a (partial) basement, I meant building any basement at all, because it simply makes more sense from a structural point of view on a slope. Or am I wrong? It can also be a full basement; our considerations have not gone that far yet, just that there should be a basement. The neighbors have a partial basement, which is why I bring this up.

The part about the costs for the [Gutachten] is correct. You have convinced me.