The subject of the discussion is the striving for unification of the property valuation, understood both as a process and as a result of this process. The article attempts to assess the effectiveness of the efforts of international organizations to develop and promote a single model of the property valuation and to indicate the causes and consequences of the failure of this effort. The methods used include an analysis of the relevant literature, International and European Valuation Standards as well as European Union legislation. The analysis reveals that the process of unification of valuation through standardization has failed. It is visible at the stage of defining the value of the property and its interpretation as well as the principles of drawing up the valuation report. The process of unification takes the form of harmonization of valuation, which, mainly due to different legal regulations and ambitions of national institutions, also has little chance of success. This has an adverse effect on the comparability of estimates, understood as the outcome of the process of achieving the value. For the sake of the recipients of valuations, there is an urgent need for international research on differences in national legal systems in order to explain their impact on the estimated value.

The subject of the discussion is the striving for unification of the property valuation, understood both as a process and as a result of this process. The article attempts to assess the effectiveness of the efforts of international organizations to develop and promote a single model of the property valuation and to indicate the causes and consequences of the failure of this effort. The methods used include an analysis of the relevant literature, International and European Valuation Standards as well as European Union legislation. The analysis reveals that the process of unification of valuation through standardization has failed. It is visible at the stage of defining the value of the property and its interpretation as well as the principles of drawing up the valuation report. The process of unification takes the form of harmonization of valuation, which, mainly due to different legal regulations and ambitions of national institutions, also has little chance of success. This has an adverse effect on the comparability of estimates, understood as the outcome of the process of achieving the value. For the sake of the recipients of valuations, there is an urgent need for international research on differences in national legal systems in order to explain their impact on the estimated value.