This article analyses the social composition of political elites in the Chilean legislative branch, specifically in the Chamber of Deputies between 1990 and 2014. The personal characteristics and re-election rates of deputies in that period (n = 720) are analysed. The degree of homogeneity in the educational background for each legislature is complemented with interdependence models, specifically cluster analysis with a non-hierarchical grouping algorithm, as well as social network analysis. The findings suggest that the closer a legislative period is to the democratic transition, the more homogeneous/dense it is social composition. Despite the confirmation of the sociocultural elitisation of deputies, this does not imply, generally speaking, a greater concentration of density in the post-transitional legislatures.