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Abstract Background Self-initiated and proactive changes in working conditions through crafting are essential for shaping work and improving work-related well-being. Recently, the research stream of job crafting has been extended to other life domains. The present paper aims to study a novel crafting concept—work–nonwork balance crafting—investigating the role of its antecedents and identifying relevant outcomes. Work–nonwork balance crafting is defined as individuals’ unofficial techniques and activities to shape their work–nonwork balance, here considering their life domain boundary preferences. Methods In the study, 1,060 employees in three European countries (Austria, Germany and Switzerland) were surveyed in a longitudinal three-wave study with three-month intervals. We explored the influences of job/home demands and resources as antecedents of work–nonwork balance crafting. Important constructs for employee health and well-being (i.e., work engagement, work-related burnout, mental well-being and detachment from work) were investigated as outcomes. Results The findings suggest that resources and demands in the context of work or home are key antecedents of work–nonwork balance crafting. Work–nonwork balance crafting was also predictive for important employee health and well-being outcomes over three months, mainly in a positive and health-promoting way. Conclusion This study provides insights into the antecedents of proactive efforts to balance the complex interplay of life domains. By studying work–nonwork balance crafting, we provide a new perspective on crafting beyond job crafting, which may help maintain or improve employees’ mental health and well-being.