At MacDonald-Miller we believe the soul of a building isn’t found in its steel or glass, it’s found in the people who build it and keep it running day after day. We’re here to support those who show up early, stay late, and resolve issues before they become problems. For the past sixty years, we’ve done more than build and maintain complex mechanical systems; we’ve built lasting relationships throughout the Pacific Northwest.
MacDonald-Miller is more than just a name on a bid sheet. We’re the team behind the team; the experts who make sure the heat kicks on in the cold of winter and the hospital hums night after night. When it comes to HVAC, plumbing, controls, construction, service, and sustainability, we handle it all, seamlessly, because that’s what great partners do.
When the job is complex and the stakes are high, that’s when we stand out. Tight timelines? Aging infrastructure? Shifting codes? We lean in with grit, precision, and expertise. We prefab in-house, build lean on-site, and work safely from start to finish, delivering smarter, faster, cost-effective results on every project — no surprises.
And when the project’s over, we’re just getting started. Our service team keeps things running smoother, cleaner, longer. We help customers stay efficient, stay compliant, and stay ahead.
This is what we believe: behind every great building is a great team. And when you work with us, that’s exactly what you get— people who care, who show up, and who stand by their work, so your building works better.
That’s the MacDonald-Miller way.
800-962-5979