Aesthetics is beauty. Although may be functional, many electrical installations in developing countries yet suffer dearth of acceptable aesthetic sense mostly due to lack or laxity in the knowledge and application of basic design theories. This study therefore examined design principles and theories used in graphic design and how these theories apply in electrical installations as a contribution to fostering a more aesthetically sensible and functional environment.  Adopting a descriptive approach, a sample size of 398 respondents was taken in selected cities in Nigeria. The study showed a significant relationship between application of graphic design theories and the rendering of attractive-functional electrical installations. It also revealed that users consider electrical installations as more aesthetically satisfactory with the application of graphic design theories even though many practitioners in the study area do not consider them during installations. This study therefore established the significance of aesthetics, attainable through proper application of design theories and principles, in achieving a more sustainable environment as people tamper less destructively with structures and installations possessing greater aesthetics