PurposeThis research aims to establish the applicability of the International Organisation for Standardisation (ISO) 18404 standard to the service sector, identify any required amendments and identify the critical success factors and barriers to deploying the standard within the service sector.Design/methodology/approachThe study used a qualitative approach by interviewing operational excellence (OPEX) professionals who work in the service sector.FindingsThe findings indicate a significant lack of knowledge about the existence of the standard and a general scepticism regarding the applicability of the current ISO 18404 standard to the service sector.Research limitations/implicationsLimited examples of the application of ISO 18404 in organisations exist, as only a few organisations have adopted the standard. Therefore, the research focussed on the challenges and obstacles that experienced OPEX professionals perceived could be an issue.Originality/valueThe study will aid service sector organisations in understanding the standard and, subsequently, determine whether to pursue it as part of an OPEX programme. This research is the first study on the application of ISO 18404 to the service sector.