Building design features contribute to the performance of indoor daylight quality. Reading spaces in library buildings require effective daylighting for good learning processes and energy savings. This study investigated the indoor daylight quality of the six reading spaces labelled Esut-Hall A, Esut-Hall B, Esut-Hall C, Esut-Hall D, Esut-Hall E, and Esut-Hall F. It determined the influence of individual building design features on daylight quality. The study adopted case study research, combined with an HS1010 light metre experiment. The first result identified twenty-five building design features that influenced the daylight quality. The second result indicated that the illuminance values of Esut Hall A, Esut-Hall B, Esut-Hall D, Esut-Hall E, and Esut Hall F are within the recommended range of 300 lux and 500 lux. Only Esut-Hall C is below the range. The identified design features showed that some of the windows in Esut-Hall C were ineffective due to some internal wall obstructions. Therefore, it was recommended that the effective windows' area be increased, and top-light windows be introduced.