There isn´t general consensus concerning the tools for evaluating of decentralization and public administration reforms. Comparison of impacts and tools for the evaluation of decentralization process is complicated mainly by a different arrangement of public administration, researching only partial aspects of decentralization or lack of key data. The aim of this paper is to legitimize the innovative approach of evaluation of the decentralization reforms through an analysis of subnational units´ staff. This consideration is based on correlation which suggests that countries with a higher degree of autonomy of subnational units usually have a wider bureaucratic apparatus of self-governments. In this context we answer whether the evaluation of Czech decentralization is relevant through an analysis of self-governmental staff and under which methodological preconditions. We worked with fragmented statistical unique and unpublished primary data about the self-governmental staff obtained from registers of the Ministry of Interior, the Ministry of Finance and the Czech Statistical Office.