Energy use in buildings is a significant contributor to greenhouse gas emissions and climate change; the residential sector uses more than 20% of the energy in the United States. For this reason among others it is important to implement sustainable design practices in construction. Previous research has shown that there are significant barriers to doing so and that sustainability is not a main consideration in choosing the structural system. To improve understanding of structural engineers' attitudes toward sustainability, an opinion survey was conducted in Oregon and Washington. Both quantitative and qualitative methods were used. Results highlight lack of information as a major barrier to adopting sustainable design practices. Respondents request standardized, current, and reputable data applicable to codes and standards. Results also indicate that clients are the most important influence on structural engineers. Results suggest that structural engineers should expand their thinking about both techniques and how engineering fits in the larger context of sustainable development. Results also suggest that the profession as a whole needs to become more assertive in advising and educating clients about sustainability. (C) 2014 American Society of Civil Engineers.