This study presents an evaluation of the carbon footprint associated with autoclaved aerated concrete (AAC) masonry buildings, accounting for the influence of seismic action on the overall environmental performance. A case study building, assumed to be located in different Italian sites, is considered. Seismic vulnerability analysis is carried out to define the interventions necessary to repair the building damage due to a seismic event, expressing the relative costs in terms of carbon footprint. To this aim, nonlinear static and dynamic analyses are performed on the numerical model of the building, developed adopting an equivalent-frame strategy. Life cycle assessment (LCA) methodologies are then applied to quantify the embodied carbon emissions throughout the entire building's lifecycle. The results allow to investigate how the seismic performance can impact the total carbon footprint and to evaluate the performance of AAC masonry buildings in a more comprehensive framework.