Background: The construction of postwar housing in Poland does not meet the quantitative and qualitative needs of society. There is a shortage of thousands of apartments. The average apartment area is smaller than in other European Union countries. Increasing the supply of apartments and their availability for low-income society is achieved at the cost of lowering their quality and spatial standards and the lack of adaptation to the needs of seniors and the disabled. As a result of demographic and cultural changes, these groups are currently more visible in economic processes, including housing investments. Material and Methods: The article analyzes demographic processes (ageing of society) and lifestyle changes in Poland after World War II. They are the basis for studying the adaptation of apartments to the needs of older people. The following research methods were used: statistical, historical, and analytical-comparative. They were justified by available statistical data. Then analyses of representative plans of postwar Polish apartments were presented. The research aims to indicate the disadvantages and conditions for improving apartments’ functional and spatial values for older and disabled users. Results: The topic of adapting apartments for seniors is current and necessary. Research shows the advantages and disadvantages of typical apartment plans. The functional and spatial quality of older and modern apartments is analyzed. The assessment was made in the context of changing lifestyles and housing needs. Recommendations for improving the quality of apartments were indicated. Conclusions: It is postulated to indicate possible functional changes to adapt existing and planned apartments to specific needs in the context of contemporary demographic trends. The recommendations take into account the specific needs of seniors and people with mobility impairments. They can also contribute to improving the functional quality of apartments for people who are still able to move. Med Pr Work Health Saf. 2025;76(4)