Southwestern Dakotah, Inc. (SDI) is a General Contractor Specializing in: new construction, additions, alterations, remodel, retrofit, underground utility, and design-build. SDI is a Native American, Woman-Owned, HubZone Certified firm. SDI conducts work in Arizona, New Mexico, California, Nevada, Texas, Utah, and Colorado. Currently SDI is seeking to expand into additional parts of the Country.