Business Details
50+ Years
experience
Trusted Engineering Solutions in Bay City, MI
Established in 1963, MacMillan Associates is a multi-disciplined consulting engineering firm dedicated to delivering high-quality services that provide exceptional value to clients across the Great Lakes Bay Region and nationwide. Our expertise spans structural, mechanical, and electrical engineering, with specialized capabilities in industrial systems, LEED sustainable design, and 3D laser scanning. We prioritize personalized client attention, working closely from initial project scoping through construction observation to ensure alignment with design intent. Our team of 42 professionals, including 31 engineers with an average tenure of 14 years, combines decades of experience with cutting-edge technology to solve complex engineering challenges. We maintain a legacy of excellence through continuous innovation while preserving the personal service ethos established at our founding as McClurg and MacMillan, Inc.Our commitment to quality is demonstrated through comprehensive project management, BIM coordination, and commissioning services that ensure systems perform as intended. With a track record of successful projects in commercial, educational, healthcare, and industrial sectors, we provide reliable engineering solutions tailored to each client's unique needs. Our staff's diverse experience, ranging from entry-level to over 50 years, ensures we can tackle projects of any scale while maintaining cost-effectiveness and technical rigor. We remain headquartered in Bay City, Michigan, operating from a historic 1873 building that reflects our deep community roots and dedication to preserving architectural heritage.
Services
Structural Engineering
Mechanical Engineering
Electrical Engineering
Industrial Systems
LEED Design
3D Laser Scanning
BIM Coordination
Project Management
Commissioning Services
Details
- Year established: 1963
Highlights and features
- We offer 60+ years of engineering expertise since 1963
- Our team includes 13 licensed Professional Engineers
- We provide full-service engineering from concept to completion
- Our staff maintains an average tenure of 14 years
- We combine advanced technology with personalized service
Services
Structural Engineering
Our Structural Engineering Department specializes in solving complex challenges with economical solutions for steel, concrete, masonry, and timber systems. We address foundation problems using underpinning, sheet piling, and deep compaction methods while preserving historic structures. Our services include analysis, design, and renovation of commercial, industrial, and institutional buildings, ensuring safety and compliance with current codes.
Mechanical Engineering
We design complete building mechanical systems including heating, ventilation, plumbing, and geothermal solutions. Our team provides commissioning services to verify system performance and offers re-commissioning for existing systems. Specializing in energy-efficient designs, we create VAV systems, boiler/chiller plants, and solar heating solutions while maintaining compliance with ASHRAE standards and sustainability requirements.
Electrical Engineering
Our Electrical Engineering services cover building power systems, specialty lighting, and emergency power design. We conduct arc flash studies, short circuit analyses, and design solar/wind power systems. Our low-voltage expertise includes security, data, and communication systems, ensuring reliable electrical infrastructure for commercial and industrial facilities while meeting NEC and IEEE standards.
3D Laser Scanning
We utilize high-definition laser scanning to create accurate point clouds and as-built documentation for facilities. This technology supports renovation projects, clash detection, and BIM integration. Our scanning services include thermal imaging and deliverable formats compatible with AutoCAD and REVIT, providing precise spatial data for structural, mechanical, and electrical systems analysis.
Project Management
Our project managers coordinate multi-discipline teams through all phases from planning to completion. We provide cost control, scheduling, and quality assurance for projects of all sizes. With both office-based and on-site management options, we ensure timely delivery while maintaining technical excellence and budget adherence across commercial, industrial, and institutional sectors.
People
Bill Thayer
Professional Engineer
Bill Thayer, PE, is a recognized engineering leader with extensive experience in structural systems and project management. As 2025 SEAMi Engineer of the Year, he brings technical expertise and innovation to complex engineering challenges while maintaining MacMillan Associates' commitment to quality and client satisfaction.
Questions
What engineering disciplines does MacMillan Associates offer?
We provide structural, mechanical, electrical, and industrial engineering services along with BIM coordination and 3D laser scanning for commercial, industrial, and institutional projects.
How long has MacMillan Associates been in business?
We've provided engineering services since 1963, originally established as McClurg and MacMillan, Inc., with our current name adopted as the company expanded nationally.
What markets does MacMillan Associates serve?
We work with commercial, educational, healthcare, government, industrial, and religious clients on projects ranging from new construction to facility renovations and sustainable design implementations.
Where is MacMillan Associates located?
Our headquarters are at 714 East Midland Street, Bay City, MI 48706, in a historic 1873 building that was originally the Sage Lumbermill offices along the Saginaw River.
What makes MacMillan Associates different from other engineering firms?
Our combination of 60+ years' experience, 14-year average staff tenure, and personalized service approach ensures technical excellence while maintaining client-focused project execution across all engineering disciplines.
Reviews (1)
Eric Coy
Dec 20, 2021
Report
They gave us a quick estimate on detailing & PE bless-off, for a 90 ton project. Fast responses and great detail work. we got jewelry laid out & they tweaked connections the exact way we needed them. We had cheaper options. MacMillan was the best choice.
