The Benchmark of Excellence

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 and Rochester Hills, Michigan, San Antonio, Texas, and multiple field offices, SDA offers civil engineering, surveying, and construction engineering services for municipal, land development, transportation, and water/wastewater projects along with full pavement management and landscape architectural services.

Core Purpose

Creating Infrastructure Solutions for Our Life & Planet

Guiding Principles

As an Owner of Spalding DeDecker Associates, Inc., ownership requires full engagement in my job mentally, emotionally, spiritually, and physically; otherwise I am just an employee.  My positive “can do” attitude must exhibit the honesty and integrity of SDA’s foundation.