Authors - Devanth Mallikarjunaiah, Neha S, Nidhi Sridhar, Niranjan M Nadiger, Venugopal N Abstract - This article explores the integration of Building Management Systems (BMS) and Light Fidelity (Li-Fi) technologies within a Direct Current (DC) network design to optimize connectivity, data transfer, and energy efficiency in smart buildings. A unique method for enhancing the general dependability and efficiency of smart building systems is to take advantage of Li-Fi's potential in a DC setting. In addition to outlining quantifiable goals to assess the integration's efficacy, the article offers a thorough investigation of the possible advantages of it. Intelligent buildings can achieve continuous connectivity throughout their premises by utilising Li-Fi's inherent advantages, which include enhanced security, improved coverage, and resistance to electromagnetic interference. Moreover, the integration with BMS enables real-time data sharing and centralised control over a range of building functions while optimising energy consumption and enhancing occupant comfort.