This paper will analyse the role of SIGMA in the development of the European administrative space through various documents that were published by SIGMA as guidance to candidate countries. This paper will explain what the European administrative space is, what SIGMA is and what impact it had on the development of this administrative space. This will be achieved through an extensive analysis of documentation published by SIGMA (63 were published in total) in a period from 1996 to 2021. This paper will analyse SIGMA documents through which it impacted the creation and reform of institutions in public administration helped in the process of establishing financial control, supervision and revision, how it impacted the effect of regulation, position of public officials, public procurement arrangements and how it shaped and contributed to public policies. Both native and foreign literature were used in the creation of this paper. Official documentation published by SIGMA was the primary source of information. Taking into account that native literature doesn’t provide sufficient information on this topic, foreign literature (SIGMA documents) was primarily used as reference. This includes scientific and professional papers, articles and documentation available on an online data base. This paper is a continuation of the analysis conducted by dr.sc. Goranka Lalić Novak in an article called “An overview of SIGMA documentation in a period from 1992 to 2009, and it includes documentation published since then. This paper consists of five sections. In the second section, we will analyse the term European administrative space, its origin and features. In the third section, we will discuss the SIGMA initiative, its tasks, goals and impact. In the fourth section we will analyse the effect of SIGMA on the development of the European administrative space based on the documentation published by SIGMA from 1996 to 2021.