Residential basement approx. 80 sqm, how expensive?

why should underground be cheaper with the same quality?

If building living space above ground already costs 2000€/sqm and more, why should it be cheaper underground with the same quality?

On the one hand, you get more living/usable space in a smaller area (which can also be quantified in money given today's land prices), you don't have expensive window fronts, you theoretically don't have to plaster the exterior walls but can just putty them,...

I still can't quite understand these cost differences between residential basement and utility basement. For one basement, for example, you save the costs for the roof and the heating system. And electricity also has to be installed in the utility basement. So why should the price per square meter be similar to that of the turnkey ground floor/upper floor?

On the one hand, you get more living/usable space in a smaller area (which can also be quantified in money given today's land prices), you don't have expensive window fronts, you theoretically don't have to plaster the exterior walls but can just fill them,...

I was talking about the same quality. That means, for example, excavations for windows. The insulation is more expensive, the earthworks themselves are additional, as is the longer construction phase, which costs money. But if by a basement with living space a heated room with a ceiling height of 2.35m and a light well is meant ... well, then it might only cost the same as above-ground space.

I still can't quite understand these cost differences between residential basements and utility basements. For one basement, for example, you save the costs for the roof and the heating system. And electricity also has to be installed in the utility basement. So why should you then come to similar square meter prices as for the turnkey ground floor/upper floor?

The heating system has to be bigger. Underfloor heating scales accordingly. The earthworks already cost more than a roof.
Extra stairs, more expensive insulation.

To really understand it, you would have to compare specifications.

I was talking about the same quality. That means, for example, excavations for windows. The insulation is more expensive, the earthworks themselves add to the cost, as well as the longer construction phase, which costs money. But if a living basement means a heated room with a 2.35m ceiling height and a light well ... well, then it may only cost the same as above-ground area.

The question is what he intends to do with the basement in the end. For living spaces, of course, I have to spend more money; for a hobby room, laundry, technical rooms,... a basement is definitely a good alternative to above-ground construction. The perimeter insulation on the walls doesn't really cost much money, and you can do without the insulation under the slab if you anyway have a floor structure with insulation because of underfloor heating. The resulting thermal bridges are minimal in a building with a basement and cause hardly measurable heat loss. In addition, you can lay the insulation on the slab yourself.

Are you assuming 2.35m raw construction height? That then, of course, has nothing to do with a living basement. With 2.35-2.45m finished measurements, plenty of houses are built. Our basement also has 2.34m finished. The ground floor/upper floor then 2.55m.

If someone says Wohnkeller, then they probably mean living rooms as well, and in that case the rules and execution of living rooms apply, not those of a storage room.