Advanced urban sprawl has many negative economical and ecological consequences and thus can be seen as a major problem in the Austrian land use planning system. Although many regional planning acts explicitly aim at an efficient land use policy and the prevention of urban sprawl, municipalities have the freedom of scope to some extent because the achievement of these planning-related principles and objectives is rather optional. Besides the zoning of „Bauland“, which underlies a strict regulation, some states in Austria also have exemption clauses that allow building actitivies in the „Grünland“ category. Assuming an extensive interpretation, these clauses thus increase urban sprawl tendencies. In this diploma thesis, an exemplary overview of four exemption clauses is the subject of further research. These are in particular „Erhaltenswerte Gebäude im Grünland“ (Lower Austria), „Auffüllungsgebiete“ (Styria), „Kennzeichnung von Lücken im Grünland“ (Salzburg) and „Einzelbewilligungen“ (Salzburg). In this regard, not only the criteria as well as advantages and disadvantages of these clauses, but also good and bad practice examples of the current planning practice should be investigated from a closer perspective. In the final part of this diploma thesis, the examined exemption clauses are discussed critically from a planning-wise point of view and in addition, practical recommendations for the future are expressed.