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This paper presents assessment of economic effectiveness and cost-efficiency of four selected sustainable rainwater harvesting designs for shopping mall under climatic and financial conditions of Lublin, Poland. The four proposed designs, different in the proposed manners of rainwater storage, allowed retention, treatment and reuse of rainwater in order to decrease tap water consumption for toilets flushing, floors cleaning and green areas watering. The economic effectiveness of proposed designs was determined using three indicators: Payback Period (PP), Net Present Value (NPV) and Benefits-Costs Ratio (BCR), while the cost-efficiency assessment was based on the Dynamic Generation Cost (DGC) indicator. Additionally, the relation between cost-efficiency, economic effectiveness and variable annual rainwater demand allowing to partially replace tap water consumption was also determined. Most of the proposed designs were assessed as profitable, allowing the financial benefits for the investor, due to savings resulting from the reduced tap water demand for cleaning, toilets flushing and green watering. However, the determined economic and costs efficiency levels are highly related to maximization of rainwater use and decrease in tap water consumption.
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