Single-family house made of precast concrete parts?

Faith can move mountains, but it does not change reality. Reinforced concrete house construction is a special case. And special cases cost money, like any special request.

It only becomes cheap in mass production – see German row houses. As a completely individually planned house, it becomes more expensive.

Fortunately, I have in front of my eyes both the costs for the prefabricated elements of my reinforced concrete basement, as well as those for the timber frame prefabricated elements in the ground floor/attic. The differences are minimal, or even non-existent when considering technical simplifications (the ground floor/attic no longer need 30 cm watertight concrete with special joint sealing, steel reinforcement can get thinner per floor). I do not want to generalize, and I have no idea what the costs for brick-on-brick construction would be in comparison, but I assume they are in a similar range.

We are currently building and the house is a mix of reinforced concrete, precast concrete elements, and masonry. We needed reinforced concrete because we have many large floor-to-ceiling windows on the ground floor and some projections on the upper floor.

Concrete is simply more expensive (especially reinforced concrete), although every master builder calculates differently. Our master builder, for example, charges the same for precast elements and cast-in-place concrete. However, we had another offer where the precast elements were significantly more expensive. Personally, I don't like the precast parts in living areas – they are very plain and cold and you have to like that. As already said, you also have to plan exactly in advance where all the cables, etc. will be laid.

We have planned one exposed concrete wall in the hallway with a cantilever staircase. It is important to find someone who can achieve the right look there.

Prices for us, in case anyone is interested, for interior masonry 24cm (exterior masonry is more complicated to compare):

Planziegelsteinen - 69 EUR/m2
Cast-in-place concrete - 75 EUR/m2 plus 59 EUR/m2 surcharge for exposed concrete look.

And it can always be that the concrete cosmetician also has to come (although we used new formworks, so hopefully not).

Your price is not bad - I would have to pay 109 € /m2 net for my (prefabricated) filigree double wall C25/30, d=24 (inner wall) (and that without reinforcement, calculated separately). This provider was quite inexpensive in comparison. o_O

I assume your price refers to raw construction surfaces? That is, plan brick without interior plaster? If so, cast-in-place concrete might end up being just as expensive or even cheaper, because with appropriate care the surfaces should require much less treatment to get them ready for painting (of course depending on the desired wall design).

Exposed concrete is obviously a different price category.

...and not to forget that most of the time in the basement, surface-mounted installations are used. In living areas, you don't encounter that as often anymore ;)

The costs of the pure prefabricated element or the in-situ concrete wall per se are one thing. But another are, for example, boxes for sockets, light switches, cables for electricity, water, wastewater. You might be quite surprised by how much planning and execution all that involves. A wall chase milling machine is definitely easier to handle.

Certainly dependent on the provider - factory planning and partly the execution can be largely automated with prefabricated parts.

For us, for example, there were additional costs of €79 / 20 boxes (in our case there were 60 boxes in total) for electrical planning/technical processing, and as examples for the execution: €7.80 per electronic box (Kaiser) as well as €8 / m empty conduit M25.

Since I happen to have an electrical offer for another construction project in front of me: creating wall openings per box: €7.06 (without the box), cable routing in unplastered masonry with a slot cutter as a wall groove: €7.42 / meter, etc. - i.e. not necessarily significantly cheaper, especially when you consider that the empty conduits also have clear advantages in terms of maintainability (assuming proper installation, of course).

I'm happy for you if (depending on region and/or provider) the concrete construction is not more expensive or even cheaper for you. However, this is usually not the case in the single-family house sector (different rules apply for multi-story buildings). You can also tell because hardly anyone does this in the single-family house area unless there are special requirements (structural reasons or a desire for exposed concrete).