Sustainable urban planning is more crucial than ever in today’s rapidly urbanising world. As cities expand, balancing development with environmental stewardship and resource management becomes increasingly important. One of the key technological advancements aiding in this mission is the Online Building Plan Approval System (OBPAS). By streamlining the building approval process, reducing inefficiencies, and promoting compliance with sustainability regulations, OBPAS is playing a significant role in supporting sustainable urban planning.