Abstract Objective. Early intervention has been shown to benefit people at-risk for psychosis, but knowledge about how early intervention benefits all help-seeking adolescents is lacking. The aim of the present study was to study change in health-related quality of life (QoL) and functioning ability in help-seeking adolescents who participate in a community- and family-oriented early intervention program. Methods. The data was collected in Finland by an early-intervention team. Ninety help-seeking adolescents between 12 and 21 years of age filled out a questionnaire on QoL (16D) and functioning ability (GAF), which was assessed by workers at the beginning and at the end of the intervention. A PROD screen was used to assess heightened risk of developing psychosis. Results. QoL and functioning ability showed significant differences (p < 0.001) between the beginning and the end of the intervention, as well in a subgroup of participants at heightened risk of developing psychosis (QoL, p = 0.008; GAF, p < 0.001: n = 35). 35.6% improved over the clinical cut-off point in functioning ability and 48.6% of the subjects at-risk. 53.3% reached clinically significant improvement in QoL and 54.2% of the subjects at heightened risk of developing psychosis. Conclusions. The results suggest that there is both statistically and clinically remarkable improvement in QoL and functioning ability after a need-adapted, family- and community-oriented intervention.