This study proposed an integration process to incorporate sustainability issues into engineering design for construction projects. To facilitate use by engineers, the integration process was built on the traditional design process. Design work is the foundation for the integration process. Because engineers are familiar with design work and processes, the linkage between the eight design steps and six integration steps make the integration more concrete. The study results show that the integration process can help participants to incorporate sustainability issues, communicate with stakeholders, and achieve consensus, if followed rigorously. The integration steps, such as creation of the integration team and evaluation of alternatives, are similar to the elements dealt with in environmental impact assessment. Since sustainability integration is actually a decision-making and execution process, its management should have the attention of the government, construction owner, and integration team.