AbstractThis study aimed to provide a wider understanding of the determinants of job crafting by jointly considering employee well‐ and ill‐being (work engagement and exhaustion) and socio‐environmental factors (supervisor and colleague support) as possible levers to promote job crafting. A secondary goal of this research was to simultaneously explore the multidimensionality of work engagement and the potentially differentiated associations between the different facets of work engagement and job crafting behaviours. Questionnaire surveys were collected among 533 workers from various organizations located in France. Results from preliminary analyses showed the superiority of a Bifactor Exploratory Structural Equation Modeling (B‐ESEM) representation of work engagement when compared to alternative representations of ratings of this multidimensional construct. Specifically, employees' ratings of work engagement simultaneously reflected a global work engagement construct, which co‐existed with specific vigor, dedication and absorption components. Results from a predictive model indicated that the different facets of work engagement held differentiated relations with job crafting behaviours, while exhaustion did not significantly relate to any job crafting behaviours. Colleague and supervisor support also held differentiated relations with the demands‐related job crafting behaviours, while both forms of support were associated with employees' seeking more job resources. Theoretical and practical implications are discussed.