The aim of this paper is to examine the crucial role the correct of 3D Survey in the of high-quality conservation projects. A “conscious, sensitive, and controlled” application of digital acquisition systems a reality-based technologies can be particularly beneficial for documentation, conservation, and valorization, provided that these tools are rigorously integrated and combined with direct engagement with the architectural; it is an essential and irreplaceable condition rather than an ancillary one. Drawing on extensive experience in this field, the study reflects a multidisciplinary approach characterized by strong cohesion of intent and shared objectives. It seeks to highlight the advantages of integrating and proactively employing these valuable tools. To this end, the paper presents a highly relevant case study: the recent restoration of the Rotonda di San Tomè, in Almenno; this case exemplifies the adopted survey methodology and illustrates the benefits of an integrated survey program, applied both during the knowledge acquisition phase and throughout the subsequent construction phase.