Oh, things continued quite lively here, only after a few posts no more notifications came... :rolleyes: We like open living, in our current apartment cooking, eating, and living room are also combined in one room - albeit not "in a row" - and we like the setup because the family meets there for different "daily situations." Therefore, we chose an "all-purpose room." (I hear between the lines that the houzz community is not so popular here? ;)) Regarding the basement, there is already a "big hole" after the demolition, so the costs for excavation disposal are largely omitted. Also regarding the later resale value, a basement seems sensible to us, after all, you can't just "retrofit" one. Furthermore, the technical installations have to go somewhere - if not in the basement, then living space is lost instead. Concerning the cost question: a few months ago we had offers made by two well-known and established construction companies here in the region for houses with slightly larger volume and similar floor plans, which were between 500-550k € - in standard equipment and without outdoor facilities as a KfW efficiency house 40.