Our Volunteers (2014 Impact Survey) 75% of our volunteers have a problematic substance use history of longer than ten years. 50% regard their volunteering roles as an interactive form of mutual aid. 84% said that volunteering has a positive impact on their lives, and 26% regarded that impact as life changing. 66% said that their mental health has improved because of their volunteering 98% reported the support they received from Build on Belief as good or better. 100% said they had learned new skills while volunteering with Build on Belief.