Floor plan planning shortly before submitting the building application

-> Bodengutachten sagt zeitweise aufstauendes Sickerwasser (Lehmboden)

That would probably be stress class 2. According to WU guidelines, minimum thicknesses are 20cm for in-situ concrete, 24cm for element walls (or 20cm with F6 concrete).

It could probably work, at least as in-situ concrete.

But I find it wiser to simply skip it, because these are minimum thicknesses. The room has at least two, mostly three, walls for sockets. Unless the basement is really lived in, you can do without sockets on every wall there. Aside from the fact that these will probably be the most expensive sockets in the whole house.

Hi Alex, thanks for the info. The execution is in onsite concrete. The room is the fitness/guest room or could also be used as an office. It is a room of about 25 sqm and effectively 2.5 to 3 exterior walls -> concrete (imagine an L-shaped floor plan). So it will be a “full-fledged” living space, with a light well to ensure there is enough light for living purposes. Surface mounting is therefore out of the question. My idea is rather to concentrate the boxes on just one concrete exterior wall (one on the left and one on the right corner), and to avoid the expensive concrete boxes, I'm thinking of simply installing a stud wall with 10 cm Ytong or drywall on the wall. We'll see what it ultimately becomes.

Of course, that is also possible. With the floor plan, it makes sense.

Now it will not be cast-in-place concrete after all. The shell builder has quickly found someone who can supply precast parts on time.

Earthworks are now in full swing.

Unfortunately, the soil is partially classified as Z2, which makes disposal significantly more expensive.

The contractor asked me whether a pipe should be laid under the garage to possibly run power cables, water pipes, etc. to the garden later. The electrician says it doesn’t help him because a distribution box will be installed in the garage anyway. Is something like that necessary for a future lawn sprinkler, or what can such a pipe actually be useful for? You will get a water tap at the back of the house anyway, so there must be water available on the property side as well.

The construction contractor asked me if we shouldn't lay a pipe under the garage to possibly run power cables, water pipes, etc. to the garden later on.

Give him a (Ferrero) kiss for being so thoughtful. In my next life, I will become a preacher for empty conduits.