MacDonald-Miller Facility Solutions is a design-build mechanical contractor founded in 1965, with more than 1,600 employees operating across the Pacific Northwest, including offices in Seattle, Portland, and Spokane. The company delivers integrated solutions spanning HVAC, plumbing, electrical, building automation, and energy efficiency, combining in-house engineering, fabrication, and construction capabilities.
The firm's technical expertise covers building performance optimization and high-performance building systems. Its portfolio of industry verticals includes data centers, along with commercial, mixed-use, healthcare, government, education, life science, biotech, industrial, and manufacturing facilities. MacDonald-Miller provides 24/7 support and rapid response services aimed at maintaining tenant comfort and operational continuity.
The company's stated core values are collaboration, dedication, safety, community, innovation, and fun. Teams work across integrated project delivery models, with clients entrusting complex mechanical and building systems projects to the firm's combined design-build approach.
