The Christchurch rebuild has presented a significant opportunity for young workers to relocate for work. This growing population of tradespeople increases the potential for work site accidents, particularly if drugs and alcohol are involved. The Christchurch Safety Accord, which included five major construction companies, was set up to improve health and safety awareness on-site and was concerned about the impact of drugs and alcohol use on site safety. A drug and alcohol education programme provided by Mental Health Education Resource Center (MHERC) had been underway for several months. We were contracted to work with ACC and MHERC to examine how effective this programme was and what they might do to support the construction sector.