This study aims to identify the factors influencing the promotion of Building-Integrated Photovoltaics (BIPV) using the FGI and 1st Delphi methods to omit, add, and group the factors affecting the promotion of BIPV, and applying a 2nd Delphi method to confirm the relationships between the identified factors. A survey of companies engaged in the BIPV industry was conducted to collect data, and statistical analysis, such as exploratory factor analysis and correlation analysis, of the data collected with the Delphi method was performed. The independent variables were classified as BIPV policy environment, market environment, and manufacturing environment, and the dependent variable of BIPV system installation was predicted. The correlations between these variables were then analyzed, making it possible to promote the domestic BIPV industry and devise an efficient strategy for the activation of the BIPV industry before the diffusion of BIPV.