Build-On is a collection of phenomenal architectural transformations that bring new life and function to existing structures. Exceptional examples of large-scale radical renovations and adaptations of industrial wasteland, bunkers, abandoned churches and forsaken rural centres are featured along with creative transformations of smaller building units in the urban and rural context. These overlooked architectural sites are reborn as inhabitable residences, working spaces, art spaces and hotels. This unique collection of inspiring architectonic transformations affirms this sprawling area of innovation and at the same time presents social and cultural interplay between past, present and future.