A method is presented for non-results-based effectiveness indexing of construction site managers (CSMs). The 52 competence element index is based on previous research on construction-specific competency elements and stakeholder assessment systems. The method was qualitatively assessed through industry focus groups and quantitatively validated through an empirical study. The performance of 61 Australian CSMs was evaluated by 329 peers, superiors and subordinates. The measurement tool successfully measured each individual's level of ability on each competence element and produced an individual effectiveness score for each CSM. The application of the method resulted in the identification of three levels of effectiveness: a distinct and homogeneous ‘elite’ group of very effective CSMs; a very low performing control group of former CSMs; and a group of CSMs that are adequately effective. The development and validation of the method are provided, plus some insights into the characteristics of each of the groups identified.