In the summer of 2018 a three-dimensional survey project of the entire area of the so-called Unterstadt of Hattusa began.1 This project is carried out in parallel with the study undertaken by A. Schachner, director of the excavations of Hattusa, of this area, with particular attention to the construction characteristics of that religious and economic complex conventionally defined as “Temple 1”. In this brief report on the start of the works, the criteria followed and the procedures adopted are illustrated, above all in order to create models that can represent a valid contribution to the planimetric and architectural study of the building.