PurposeThis study aims to develop a business process maturity model, especially on operation processes, based on the characteristics of each organisational growth stage, to increase small and medium enterprises (SMEs) growth. With this information, SMEs can identify their needs and priorities for business process improvement based on the characteristics that are inherent in the organisation.Design/methodology/approachThe proposed model was developed by reviewing the literature on previous studies related to the organisational life cycle and its characteristics, as well as a business process maturity model. Furthermore, historical case studies were conducted to validate the proposed model. Case study objects in this research were fashion industry companies that have grown from an SME scale to national level.FindingsThe results of this research indicate that the characteristics of each growth stage are different, which led to increased complexity and maturity of business processes run. Therefore, SMEs should pay attention to their growth stages, as a basis to improve their business process maturity, especially on the critical processes, which are evaluate products performance, design products and services and monitor sales. Through this model, SMEs can determine the business’ current growth stage and use the proposed model as guidance for business process improvement to accelerate organisational growth.Research limitations/implicationsValidation of the proposed model was done by conducting a historical case study. To generalise the model, it is recommended to survey similar industry and test quantitatively using statistical methods. However, further research can be used in other industries that might yield different results. Besides, this research can also be developed in the supporting process categories.Practical implicationsThis study provides a practical guide for SMEs to identify their current growth stage, and implement the measurement of business process maturity level. Maturity level standard at every growth stage can be used in determining the priority of business process improvement to drive organisational growth.Originality/valueThrough this research, the BPMM method was developed to enable SMEs to implement a self-evaluation process without seeking external assistance and assess their needs through a clear and understandable scale allowing for further development of the business. By using this method, SMEs can manage their business processes maturity level to encourage its growth.