This paper brings up the issue of population aging and its influence on designing and construction of buildings in Poland. It also touches the problem of adaptation of existing facilities to the needs of the elderly and the disabled. Moreover, current trends in Polish demographics and possible outlook for the next 45 years has been presented. The author presents the current legal state concerning rules and regulations on the aspects of adjusting the buildings and their parts to the needs of the disabled. Additionally, the dimensions and the areas of movement for the disabled as well as the primary functional and requirements for bathrooms have been described. In the next paragraph, a concept of Ambient Assisted Living with examples of sanitary equipment for use in residential buildings has been propose.

Over the recent years, there is a growing interest in concrete prefabrication. Many of the currently operating concrete plants have implemented systems that increase the quality of manufactured products, have expanded highly automated production lines and have clearly reduced wastes and energy consumption. However, one of the problems often encountered in the construction industry is the inefficient organization of logistics processes. Proper shipments planning of aggregates consisting of the selection of their appropriate quantity and the aggregate stock, corresponding to the needs of concrete plants should contribute to lowering costs. Therefore, it is necessary to carry out the optimization, the aim of which is to minimize costs, as well as to maximize the fulfillment of the degree of expected needs of concrete plants. This paper presents a model that allows purchase strategy optimization of aggregates with different grain size fraction. For research purposes, three separate aggregate stocks and five different concrete plants are considered.