From Concept to Monument: Time and Costs of Construction in the Ancient World celebrates Janet DeLaine's seminal work on Roman architecture and construction. One of the foremost scholars of the last decades, her pioneering research has offered important insights not only into individual structures in central Italy but also into the processes involved in creating ancient buildings. Her approach has provided important conceptual frameworks that have allowed scholars to understand Roman buildings in their proper social and economic contexts. The volume collects papers from an international conference held in Janet's honour at Wolfson College, Oxford, in January 2020. The various contributions focus on modelling the costs of construction over the course of 2,500 years, from Bronze Age Greece to the early Middle Ages. They discuss both broader issues of methodology and particular case studies, with particular attention to the effort needed in the different steps of architectural creation, such as the exploitation of raw materials (e.g. quarries), transport, and the construction processes on building sites. The papers not only cover a wide chronological and geographical area of the ancient world but also take up many of the themes explored by Janet throughout her career on Roman architecture, urbanism, building technologies, materials, and the principles of design. The wide range of papers reflects the scope and vibrancy of Janet's scholarship on Roman architecture and her enormous contribution to the discipline.