Orientation: The study was conducted in two higher education institutions that underwent insourcing and harmonisation of conditions of employment for support services.Research purpose: This study aims to determine how harmonisation shapes outcomes among support service labour in selected higher education institutions and to develop a management framework to harmonise conditions of employment following insourcing.Motivation for the study: The study capitalises on organisational complexities in higher education institutions that experienced insourcing of support services employees to address concerns assumed to be premised on historical exclusionary and exploitative employment practices. The study documents the experience and perceptions of institutional stakeholders in creating new knowledge on harmonisation following insourcing.Research approach/design and method: Employing a qualitative approach, 16 interviews were conducted with selected multi-level management and personnel directly involved in a harmonisation.Main findings: The study found tangible and intangible aspects, processes and other psychological perspectives on implementing harmonisation across employment levels. Furthermore, it was found that an efficient and effective harmonisation framework is required. Effective harmonisation for inclusion was viewed as being compromised by factors such as government intervention, and a lack of policy, framework and legislation to guide the process.Practical/managerial implications: Practical recommendations are provided for implementing harmonisation strategies following insourcing across employment levels in South African higher education institutions.Contribution/value-add: The study contributes to novel theory on harmonisation after insourcing and provides a management framework for harmonisation of conditions of employment.