Production of cement based building materials incorporating alternative filler, which comes from production industry like a waste, nowadays becomes more and more popular. It could be related not only to the cheaper expenses of the production if to compare with adequate products made of conventional raw materials, but also to the efforts to improve the quality of environmental. The global heating and environmental pollution is becoming more and more actual topic along with industrial development, as results the utilisation and recycling of production waste or by-products are set as the priority of each country. Investigations were carried out to explore the suitability of dolomite waste as fillers in expanded clay lightweight concrete by partly substituting of conventional quartz sand. Mineralogical composition of dolomite waste was detected by XRD. Obtained data indicated that the dolomite waste contain dolomite, quartz and calcite. From the view of quantitative analyse, the amount of impurity (quartz and calcite) is lower than 8.4 %. The goal of the study is to examine expanded clay lightweight concrete mechanical and physical properties by making a comparison between traditional expanded clay lightweight concrete and units which containing different amount of dolomite waste. Physical properties such as density, porosity and absorption were determined. Tests were also performed to determine mechanical properties. Frost resistance and durability were tested. It was determined that it is possible to use dolomite waste in expanded clay lightweight concrete products by partly or totally substituting of conventional quartz sand.