Assessment of the building envelope quality in terms of airtightness and sound insulation is a critical factor to properly design an optimal retrofitting action plan. Therefore, the development of reliable and non-destructive measurement techniques for assessing these factors pre- and post-retrofitting is a crucial milestone, impacting costs, precision, and time efficiency. This study explores the use of an acoustic camera in evaluating airtightness performance in residential buildings. A measurement campaign was conducted across two houses in Valladolid, Spain, integrating blower door tests, smoke generator, and acoustic camera methods to assess air leakage and its interplay with sound transmission. The main goal of this research case study is to better understand the interplay between airtightness and acoustic performance within a real building façade.