The Statewide Urban Design and Specifications (SUDAS) program, a nonprofit corporation, provides uniform design guidelines and construction specifications for Iowa’s urban public improvement projects. Iowa is the only state to develop and implement uniform urban design standards and construction specifications that are used statewide.
In addition to the SUDAS Specifications Johnston has Supplemental Specifications. This Supplemental Specification incorporates the modifications and deletions to the Iowa Statewide Urban Standard Specifications for Public Improvements as adopted by the City of Johnston as its Official Standard Specifications for Public Improvements. The modifications and deletions set forth in this Supplemental Specification take precedence over the provisions of the Iowa Statewide Urban Standard Specifications for Public Improvements, 2023 Edition.
2023 Supplemental Specifications (PDF)