Now we are finally planning the construction of our own home. [...] Our idea is to build a concrete skeleton with precast parts, [...] exterior and interior walls then with, for example, sand-lime bricks. The background of our idea is that with this construction method, we are not tied to many work steps. Somehow, we cannot imagine there being a big price difference compared to conventional construction. Filigree slabs usually cost almost as much as in-situ concrete slabs. Since we are planning on 3 floors (ground floor -1 -2), it should be financially worthwhile again from the 2nd floor with this system if we have the concrete pillars mass-produced and plan in such a way that the filigree slab is also produced in series.
Do you maybe have any tips for me regarding the basement? I am planning a basement. 3 meters high. About 80 cm above the ground. It should be a large room. About 150 sqm. It should not be living space, but will be rented out directly as a hall and will have a separate entrance from outside.
So what is it now: own home or small hall? A three-meter-high basement that floats 80 cm above the ground—on stilts?
The pillars should also make it easier to build one floor higher and only finish the exterior walls and then gradually finish the interior later or even after moving in on the ground floor. [...] A column with foundation should not cost that much, especially since all massive industrial halls are built that way.
Sure, you only achieve the prices when building in quantity and with at least X floors. [...] once my shell construction and the ceilings stand. I have peace of mind first and can continue calmly.
You have a series of charming notions about building with precast parts. It is uneconomical not only in single-family home construction but also declining in commercial construction in the segment of buildings with 1,500 sqm floor area and smaller. Hebel builds small halls with the "BoST" system (= Building without separate load-bearing structure), that is precisely
not a column skeleton. My factory (150 m long, 20 m support span) was economical as a skeleton structure, but a single-family home or a small hall is not. Break down a single-family home into equally sized—preferably square—support fields (to achieve as many identical elements as possible), there are usually only four (with the consequence of columns literally standing in the middle). So better six and possibly not square, e.g., grid distances 360 by 540?
The big serial builders launch projects several times a year with about forty almost identical housing units each. Most of them have precast plants for stairs and gable triangles; the "rest" is built "brick by brick" (applies to almost all my "usual suspects" as opposed to Deutsche Reihenhaus, which practices panel building and also prefabricates the “front garden cupboards”). The big players in aerated concrete construction (residential construction, hall construction, sand-lime bricks also in the brand portfolio of the group) also offer kit houses (also "BoST," not skeleton construction). Even the GDR built type houses as single-family homes in masonry and only used slab construction in system apartment buildings. The single-family home does not pay off as a skeleton structure—regardless of whatever worldview the responsible designers have. Skeleton construction cannot be scaled down to building classes 1 and 2, mind you, even for row house rows this construction method is not chosen, not even in socialist countries.
By the way, the "filigree slab" is mostly also an in-situ concrete slab and additionally individual, i.e., in a single-family home typically no two fields per floor are identical. Take your cheaply acquired window assortment and install it in a classically planned house "without separate load-bearing structure." You can also get wall panels, e.g., made of expanded clay (monolithically compliant with the Building Energy Act and EH). Even the precast basement providers have no stocked standard modules.