Purpose The lean manufacturing (LM) approach is a highly effective method that can be implemented in any industry to streamline production processes, meet customer demand and eliminate any unnecessary waste. This paper aims to propose and evaluate a generic project-based framework grounded on the LM approach for reducing lead time in foundry processes. Design/methodology/approach Using design science research (DSR), we developed a generic LM project-based framework for reducing lead time in foundry processes. Findings The developed framework provides an alternative method to implement LM projects to reduce lead time and nonvalue activities in foundry factories. Practical implications The findings of this research can guide better lean practitioners for lead time reduction in foundry processes. Originality/value This paper contributes to the operational excellence literature when discussing the impact of the LM approach on foundry processes. In addition, the paper provides a roadmap for reducing lead time in a foundry company.