The number of Syrian refugees in Lebanon is expected to exceed one million by the end of 2013. Tensions between host and refugee populations are expected to rise as competition over jobs and resources becomes even more important to the survival of both communities. This EMMA assessment was launched to analyze the key market systems upon which refugees and vulnerable host communities rely for income in the North and Bekaa Governorates of Lebanon in order to identify opportunities for humanitarian agencies to promote market-based income-earning possibilities for host and refugee populations. This report focuses specifically on construction labor and finds that this market system has been drastically impacted by the crisis in Syria and that construction-related income-earning opportunities are now very limited. It recommends building construction-related livelihood opportunities into humanitarian programs, particularly shelter and rehabilitation programs with construction components. It also suggests linking refugees and Lebanese workers with employment services and training.