A flat is not only a product that meets the basic human needs, but is also a place in an emotional sense. When buying an apartment, most people are guided by a location that they become attached to over time. It is not uncommon that the life situation and needs of people who own apartments change and at this point, especially for those emotionally connected with the place, the unpleasant problem of multi-faceted change arises. For example, due to the enlargement of the family, an additional room is needed, and although the apartment is large and comfortable, there is no functional possibility of separating an additional room from the existing space. Many years of observations of the above-mentioned situations prompted the author to raise this problem and draw attention to the need to design apartments in such a way that within the same apartment it is possible to separate an additional room from a larger open space, depending on the needs. Such an approach to apartment design would provide comfort to its users and save unwanted changes related to moving and leaving the place to which they are attached.