The purpose of this study was to determine intermediaries’ perceptions of barriers and incentives to innovative, energy efficient housing in Iowa. Data was collected by two surveys. The questionnaire for the first survey collected data from 102 communities in Iowa. Respondents were asked to determine the number of building permits issued for all new single family dwellings between 1975 and 1985 as well as the number of permits issued that were for passive solar, active solar, or earth sheltered housing. A rate of adoption was calculated for each community. The second questionnaire surveyed housing intermediaries drawn from the 102 communities included in the first survey. The sample consisted of 481 builders, building inspectors, realtors, lenders, and solar suppliers. Intermediary groups differed in their perceptions of barriers and incentives to innovative, energy-efficient housing. Significant differences were found among the intermediaries for whether state mandated solar standards would reduce the risk of inspection of solar energy houses and whether risky resale potential acts as a barrier to building solar energy housing. The major barriers were the "first costs" associated with building active solar and earth sheltered housing and the lack of skills among subcontractors to build active solar and earth sheltered housing. There was no significant relationship between rate of adoption among communities and their location in the state. There was, however, a significant relationship between category of building official and rate of adoption among communities. Communities with a high rate of adoption did not cluster in any one quadrant of the state. Additional differences among intermediaries occurred between lenders who had financed innovative energy efficient housing and lenders who had not. Lenders who had not financed solar or earth sheltered housing perceived the barriers to be greater than those who had. There were fewer differences in perceptions among solar/earth sheltered builders and nonsolar/earth sheltered builders. In conclusion, variability in perceptions among intermediaries on the barriers and incentives to innovative, energy efficient housing impact on the rate of adoption in communities in Iowa. / Ph. D.