Same usable area on 2 floors instead of 3?

Hello everyone,

we are currently gathering ideas for our house. We are imagining about 220m² of usable space (ground floor, upper floor, basement).

A building plot of 1000m² is already available. The plot has an east-west slope of about 14% (meaning 1m height over 7m). We want to make use of the evening sun and therefore plan to have the western basement rooms as living spaces. The eastern basement side would then be partially built into the hillside.

We have now come up with the idea of dividing the planned usable space not over 3 floors (ground floor, upper floor, basement), but only 2. We expect, among other things, to have to climb fewer stairs in everyday life (because, for example, the storage room would be on the same level as the kitchen), less space wasted because of stairs, etc.

My question now is:

Are there financial or other disadvantages if you divide the same usable space over 2 instead of 3 floors? How does this affect the costs?

I am grateful for any input :-)

Best regards

A bungalow is more expensive than a city villa. I suppose that accordingly, a basemented bungalow will also be more expensive than a basemented 2-story house.

Furthermore, I wonder whether, despite the same total area, the same division between living space and utility space is possible.
In the 3-story house, you have 2 full floors of 73m² each + the western half of the basement (36m²) = 182m² living space.
The utility space would then be 38m².

To achieve the same living space over 2 floors, you would have to create 72m² of living space in the basement in addition to the 110m² on the upper floor.
One would have to see here whether that is even feasible in terms of lighting.

We are building 3 floors without a basement. We were told that it is cheaper to build upwards because there is less earthwork, foundation slab, and roofing involved. And as Musketier already says, whether the basement floor (slope) is even feasible at all? Just consider how you would divide the two floors then and how much space would be needed.

I have now understood it as meaning that cellars are to be omitted... ?!?!?