Planning, Design and Construction The Mercy Planning, Design and Construction Web site is a resource for Architects, Engineers and Contractors working with Mercy to build the facilities that allow Mercy to provide the safest healing environment for patients. As a centralized service, we have begun consolidating forms and procedures used at each of our Strategic Service Units (SSUs). Here you will find the most current version of forms, policies, procedures and reference materials in use. If you have questions concerning the most current version of a document or how to use the information provided, please contact the Planning, Design and Construction Department at 314-628-3656.