An evaluation of a Scottish secondary school-based counselling service for students aged 11 to 18 is presented. Improvement in student emotional well-being was measured using the Young Persons Clinical Outcomes for Routine Evaluation (YP CORE) questionnaire and participant questionnaires which were developed for the study. Significant improvements were found, following counselling, for functioning, problems and well-being, with all three showing a large effect size. The counselling service was rated as helpful by the majority of the participating students, referrers and guidance staff. These findings are analysed with reference to the unique structure of this school counselling service with its governance framework integrated into the local Child and Adolescent Mental Health (CAMH) service.