Sims Design Group Associates LLC | |
| Formation | 1964 |
|---|---|
| Founder | Howard Sims |
| Type | Limited liability company |
| Headquarters | 607 Shelby, Suite 704, Detroit, Michigan, United States |
| Services | Architectural design, engineering, project management |
Key people | Howard Sims (1964–2016), Harold Varner (1973–2013) |
| Website | sdg-assoc |
Formerly called | Howard Sims & Associates (1964–1975), Sims–Varner (1976–?) |
Sims Design Group Associates LLC, often simplified as SDG Associates, is an American architectural firm, headquartered in Detroit, Michigan, U.S.. It is the city of Detroit’s oldest and largest Black-owned architecture firm. It was founded as Howard Sims & Associates, and later changed to Sims–Varner.

It was founded in 1964 in Ann Arbor by architect Howard Sims under the name Howard Sims & Associates. In 1968 the office was moved to Detroit. In 1969, the firm incorporated and Sims was given the role of president. Architect Harold Varner joined the firm in 1973. By 1976, the firm name was changed to Sims–Varner to reflect a new Varner partnership, and Varner as the executive vice president. At the beginning of the firm they struggled to find high quality clients due to racial boundaries limiting them to certain types of work. These included residential buildings and churches like Second Baptist Church that created the base for the firms pedigree. Off of this the firm began to build their cliental leading to more noteworthy projects that shaped the city of Detroit like the design of Cobo Center in 1981.
It now operates as SDG Associates. As of 2019, Wesley Sims (son of Howard Sims) is the CFO and COO of SDG Associates.

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