This paper details and discusses the methodology employed for developing a virtual auralisation of Napoleon Hall, situated beneath the Louvre pyramid, as part of an acoustic consulting study. The aim of the project was to improve the hall’s acoustics and mitigate the disruptive impact of visitor-generated noise during operational hours. The virtual acoustic auralisation was created based on a 3D geometrical acoustic model calibrated using onsite measurements. A 3D visual model of the hall was created in parallel to facilitate the generation of immersive viewpoints corresponding to each rendered scenario. Combining the auralisations and visualisations, a virtual reality application was developed, enabling project stakeholders to navigate through different positions within the hall and explore the various acoustic treatment conditions.