This thesis examines the trends in public procurement and the impact of contracting authorities’ practices on the performance of construction companies in Slovenia. The main objective is to explore the relationship between the legal framework, statistical trends, and the practical behavior of both contracting authorities and contractors. The research combines legal analysis, statistical review of public procurement data for the period 2019–2024, qualitative interviews with stakeholders, and case studies of decisions by the National Review Commission (DKOM). Findings show that public procurement in construction is a complex field intersecting law, economics, civil engineering, and public administration. Large contracting authorities with specialized departments usually ensure stable procedures, while smaller authorities and firms often face disadvantages due to limited resources. The most common mistakes of contracting authorities include incorrect procedure selection and deficient tender documentation, whereas contractors most often err in cost estimates and references. Statistical analysis confirms growth in contract values and concentration of business among the largest companies. Moreover, the study highlights corruption risks and stresses the need for greater transparency and professionalization. In conclusion, the thesis emphasizes that public procurement in construction is a vital mechanism for infrastructure development, economic competitiveness, and strengthening public trust in the fairness of the system.
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