Realistic costs for a single-family house?

Then use 11 cm KS inside and 17.5 cm KS for the load-bearing walls. Then 36 cm monolithic on the outside. Wouldn't that be an option?

Why should you use 2 different stones that possibly (???) expand differently under temperature fluctuations and thus increase the risk of cracks?

So, there is now news from the front, currently the following offer is on the table, I will try to summarize briefly:

Single-family house according to the Energy Saving Ordinance in simple construction (no bay windows, dormers, etc.) 1.5 floors, knee wall attic at least 100 cm above finished!!! floor,
walls in sand-lime brick, with Styrofoam insulation according to calculation (presumably between 16 and 20 cm) facade plastered in white.
130 m² living space (70 ground floor, 60 attic), fully basement
On the ground floor living-dining room with open kitchen, hallway and guest bath with shower (barrier-free with Aco shower channel)
On the attic 3 rooms plus main bathroom (bathtub, double washbasin, WC, barrier-free shower (Aco)). Ceramic Villeroy & Boch (Subway 2.0) everywhere.
In the attic each room has a "3/4 window", flooring laminate, bathroom tiled
On the ground floor in the "main room" (living, dining, cooking) 4 floor-to-ceiling windows, a terrace door with 2 wings, a "3/4 window" (all with electric shutters), in the kitchen 2 normal windows with manual shutters (which probably will hardly be closed). Interior doors hollow-core rebated, one glass door from the hallway into the living room.
In the basement is the garage with a slightly sloping driveway in front, meaning the house stands above street level, the technical room, storage room and an office (in addition to the 130 m²)
Except in the technical room, garage and storage room there is underfloor heating everywhere, supplied by a Viessmann heat pump (split unit)
Additionally Zehnder ventilation in the ground floor and attic.
Front door and windows are from Pax, garage door Hörmann with remote control.
Basement stairs are reinforced concrete tiled, stairs to the attic are wooden.
Electrical equipment normal, so enough sockets, several built-in spotlights in the hallway, kitchen and bathroom, large Hager meter cabinet with 2 meters, Cat over 10 I believe, Sat 8x etc. but no KNX or other expensive gimmicks.
Basement and ground floor completely tiled.
The roof tiles can be chosen by us, are from Braas.

These are roughly the key data that come to mind.
Before I name an offer sum at which some will say too expensive, others too cheap, it would be interesting what one or the other experienced builder or planner (building expert???) would estimate for it.

Best regards and thanks in advance...

So, here I am again. I have now found some construction companies that build with KS. In terms of price, it somehow doesn’t make much difference which wall structure you choose, despite the additional step due to the insulation with KS, or do you have different experiences? Since we want to do quite a bit ourselves inside, I’m a bit apprehensive about the actual advantage of KS, the hardness, when it comes to chiseling channels. The electrician probably wouldn’t charge more regardless of which stone is used, but with KS that must be significantly more laborious, or not? Otherwise, the price seems to settle at a solid standard now at around €270-280k if we have it built turnkey, including floor coverings (about €25/m² and including laying). Depending on the electrician, this could possibly be pushed down to about €260k. Including additional construction costs, land, kitchen/furnishing, and [AA], that quickly puts a 4 in front :-O And that for a modest house. I wonder how an average (dual) earner is supposed to finance this, or is building a house only something for the top 5%?

Hi Tobi 007, if you use a KS Quadro E-channel stone, you could largely avoid chiseling channels. The stones have vertically continuous channels (in a 12.5 cm grid) through which the cables can be pulled accordingly. We will also use this in our single-family house. Wall structure 17.5 cm + insulation.

Sounds just like you were also at our GU. Then I'll start the wild guessing and throw 265,000 into the room (just for the house).

How many were there now? [emoji6] We plan to build something similar, but without a basement. We are currently looking at offers between 185 and 220k for the house, excluding incidental construction costs. Then I would add 60k for the basement and estimate that you are around 270?

How much was it then? [emoji6] We are planning to build something similar, but without a basement. We are currently looking at offers between 185 and 220k for the house, excluding additional construction costs. Then I would add 60k for the basement and guess that you are around 270k?

May I ask for more detailed data about your construction project?