Only the renovation work and some floor work are "missing" (only bathrooms and utility room already have tiles).
What renovation work? You are building new, renovations should only be necessary in about 10 years.
Earthworks
I already described that
Yes and no. Everyone includes 25 or 30 cm... but that's not enough. Every plot is different and in almost every case more complex than 30 cm being sufficient. Also, the rainwater must be drained away from the house.
Basically, you have omitted all the incidental construction costs. Take a look at the pinned post about incidental construction costs at the very top. But keep in mind that these are older posts, so the costs are different both for the construction phase and in terms of time.
Electrical equipment (sockets, outlets, switches)
Exterior lighting on the sides of the house or garage/carport? Ours was similar. We had an extra cost of around 3500 from the electrician: outlets here and there, especially in the kitchen, which are still too few. Then another stove, secured circuit for the kitchen and washing machine, wall outlets, SAT system, switchable sockets, LAN, etc.
Such items are small stuff but they add up. This applies partially to plumbing, but that gets a bit more expensive: larger tub, shower partition, washbasin and mirror, different design, rimless toilet... and so on. At the house itself, the items also add up. Here 1000 there 1000... “Mr. Builder, we now have the problem that.... and could fix it like this... cost item 1000€...”
For the sampling, one should add about 15% to the total price? Currently, for example, we have only 15€/m² tiles for bathrooms and utility room.
If you like tiles for 15€/m², that’s fine. I wanted something a bit higher quality... especially the fixed floor coverings are not replaced quickly and should last several years.