Many speech and language therapy (SLT) services have limited capacity for providing school-based input. Some offer commissioned SLT input, to enhance the service provided by the UK National Health Service (NHS), giving schools the option to increase the amount and scope of SLT intervention. This two-tiered model of service provision is relatively new and has not been researched. This study investigated the experiences of schools who had commissioned input from the local SLT service, in terms of (1) describing how this was utilized and (2) exploring perceptions of its value. Semi-structured interviews were carried out with special educational needs co-ordinators (SENCos) from 11 schools and were thematically analysed using Framework Analysis. SENCos reported many positive aspects of the commissioned model, including better communication with Speech and Language Therapists (SLTs) and improved outcomes for children. SENCos felt that the numbers of children with speech, language and communication needs (SLCN) had reduced following commissioned input. Very few disadvantages of the model were identified. SLTs delivered a range of activities, including training staff and providing direct input for children. SENCos would recommend the service, and perceived the cost to be moderate. These data suggest that SENCos place a high value on SLT in schools, and welcome the opportunity to purchase additional input.