Objectives: To investigate whether a new model that delegates some out-of-home care services from the public to the private and not-for-profit sectors in England enhances practitioners' job control and stress levels. Methods: A 3-year longitudinal matched-control evaluation examined changes in Karasek demand-control model and Maslach burnout levels of 2,050 staff working in five social work practice (SWP) pilots, their host local authorities and comparable sites. Results: Mixed-effect models indicated no significant difference in main outcomes among SWP staff when compared to staff in host and comparison local authorities. There were notable differences in relation to job insecurity and social support. Conclusion: The minimal effects observed may relate to the diverse nature of SWPs with no specific work model predominating.