Master thesis deals with municipal planning documents with the emphasis on spatial implementation conditions. Developers and architects (especially designers) are often criticizing municipal regulations in the process of obtaining construction permits, saying they are too normalized, excessive and impractical. Consequently complications arise, both substantive and temporal, in acquiring building permits, which affects the uncertainty of investments in the area. Deregulation is often mentioned as a solution and it is due to this fact that we have analyzed the municipal spatial plans provisions and whether deregulation represents a real solution to the identified problem. By analyzing legislation from the year 1875 until today, examples of foreign law and theory, analysis of existing municipal spatial plans of municipalities in Slovenia and a survey among urban planners, who prepare planning documents, it was examined if the spatial implementation conditions are truly ambiguous and overdetermined. The results show that this statement is true and that many difficulties arise from inadequate legal language as well as from provisions which only suggest instead of regulate or are mostly too general (Eg. they provide consideration of traditional or modern quality facilities and arrangements in the area). At the same time they do not provide criteria to define what is traditional or of good quality. Consequently that causes possible different provision interpretations, which causes the user to think that the provisions are unclear.