This study introduces a pilot project--the creation of a Student and Family Office to reduce school violence--and suggests the benefits of the combined use of different strategies to decrease peer aggression and victimisation. The programme was implemented over a two-and-a-half-year period and included 132 Portuguese adolescents attending the third cycle of basic education. A considerable number of problematic situations, previously reported by students, changed after SFO intervention.. The results suggest that the local (universal and multimodal) intervention programme contributed to a decrease in harassment, coercion and aggressiveness, victimisation and reactive overt aggression rates, and also promoted the social and personal skills essential for successful interpersonal dynamics and peer conflict interventions. The implications for practice are discussed.