This paper reports on the implementation and preliminary evaluation of Social Behaviour and Network Therapy (SBNT) within drug treatment services. SBNT was initially developed and evaluated as part of a trial for alcohol treatment in the UK (UKATT). For the study reported in this paper SBNT was adapted for application with drug users. Therapists (N=20) from community drug services in Birmingham, UK, were trained to deliver the intervention. Training methods were supported by a treatment manual and included a two-day workshop followed by video supervision and monitoring. Following training therapists were asked to implement the treatment within the services in which they worked. Twelve of the therapists that were trained delivered SBNT to 24 clients within the study period of 8 months. Baseline and 3-month follow-up measures were administered using both quantitative and qualitative methods. This paper reports the quantitative results including drug use, levels of dependence, drug users' social network variables and family environment. Results suggest that it was feasible to train a number of therapists to deliver SBNT, and preliminary outcome results are encouraging. Further evaluation is needed in order to continue developing this promising social intervention.