Professional Civil Engineering and Surveying, as well as Landscape Architectural services for public and private projects nationwide.

Established in 1954, Spalding DeDecker Associates, Inc. (SDA) is an employee-owned consulting engineering firm specializing in infrastructure, land development, and surveying. With offices in Detroit, Plymouth, and Rochester Hills, and field offices in Cleveland, Monroe, and Trenton, SDA offers a diverse core of engineering and surveying services for municipal, land development, transportation, and water/wastewater projects. The firm also offers complete construction engineering and landscape ...

Established in 1954, Spalding DeDecker Associates, Inc. (SDA) is an employee-owned consulting engineering firm specializing in infrastructure, land development, and surveying. With offices in Detroit, Plymouth, and Rochester Hills, and field offices in Cleveland, Monroe, and Trenton, SDA offers a diverse core of engineering and surveying services for municipal, land development, transportation, and water/wastewater projects. The firm also offers complete construction engineering and landscape architectural services. Our Core Purpose The core purpose for Spalding DeDecker Associates, Inc. is to create infrastructure solutions for our life and planet.