In the Nordic region, a unique way of inviting daylight into the atrium through clerestory windows is typical and inspiring. Filtering and guiding daylight from the sides rather than above creates a unique daylight effect, like an internalized exterior environment. 

The thesis focuses on this daylight application and aims to answer the following research questions: What character does the clerestory window solution give to the atrium space? How are their daylight qualities? What are the typical considerations when applying this lighting solution?

The research analyzes the qualitative and quantitative impacts of light through three case studies: Stockholm City Hall, Oslo City Hall, and KTH Library. Through literature reviews, observation, measurements, and daylight simulation, the findings reveal the characteristics of this type of atrium and its daylight qualities.

The study concludes with practical and feasible design recommendations for incorporating clerestory window solutions in new constructions and renovations. It contains spatial configuration, geometrical and material considerations, and appropriate design and usage of floor, wall, and ceiling surfaces. These recommendations aim to enhance light quality and visual comfort, possibly preserving a unique daylight solution.