This research attempts to investigate whether the light invading inside the buildings can be exploited beyond sight. The central idea is whether this action can be used for other uses or not. One way to achieve this is by adding photovoltaic panels indoors. This study has attempted to ascertain whether photovoltaics can fit indoors and how much energy they can produce. More specifically, it examines the integration of photovoltaic panels in the layout of a typical office, calculates their potential performance and concludes if the installation can or may not meet the office’s basic energy requirements. In particular, the study was based on calculations using computer simulation programs (ecotect and daysim for the study of natural lighting and dialux for the artificial one). Also, a typical office layout of 5x4.4m was selected as the place where the survey was carried out, and then 8 photovoltaic panels were applied in places where the function and movement were not obstructed, while at the same time they were relatively close to the window (for as much solar gain as possible). The four panels were embedded in two vertical sides of the desks and the rest panels were hung on the walls. The window of the office is 3x 1.3m in size in order to allow enough sunlight to enter the room. To continue, there were calculated the solar traces in the four basic orientations East, West, North, South), as well as the traces of the luminaires on these 8 surfaces (via dialux). Having identified the office’s requirements in power in reference to a typical lighting system of 4 ceiling lamps, the results and the conclusions of the survey were extracted, followed by proposals of the system’s installation under real conditions, constraction details of the intergrated photovoltaics, a brief budget analysis of the installation, as well as issues for further research.