What building is the world’s tallest? Where is it located? The heights are measured from the ground to the architectural top of the buildings, listed in both metres and are accurate as of 2017. Currently Burj Khalifa in Dubai, UAE at 828 m is currently the world’s tallest building. In 2020, however it will be overtaken by the Jeddah Tower, currently under construction in Jeddah, Saudi Arabia, with an estimated completed height of 1,008 m.