Offer for shell construction of a single-family house 170 sqm - Is the price market-appropriate?

As a small comparison with us Electrical including network 28 Plumbing including heating 42 Ventilation in electrical for 4.5 otherwise 12 Windows and 4 doors 35 all submitted offers. We will also end up at 420.

Could you give some pointers here. 420k excluding ancillary construction costs? What own work have you done? How many sqm? Brick or plaster?

See my link a few pages earlier. Somewhere there is also a floor plan thread of mine

There is also a floor plan thread from me somewhere

That would probably be this one: https://www.hausbau-forum.de/threads/grundrisse-einfamilienhaus-160-qm-eure-erfahrungen.44386/

Small tip, use calcium silicate bricks for the interior walls….. otherwise you will hear every squeak.

small tip, use calcium silicate bricks for the interior walls….. otherwise you’ll hear every little noise.

That is doubly nonsense: first, because it is naive thinking that a heavier wall must be a better wall acoustically; and second, because that also correlates with the statics.

The structural analysis may be different (and more complex) for calcium silicate brick, but the sound insulation value is significantly better. The values are in dB, a logarithmic scale. 3dB more attenuation means that only half as much sound gets through.

Long story short: Use calcium silicate brick.