We really enjoy what we do.

At MacDonald-Miller, we make buildings work better. Period.

We are a full-service, design-build mechanical contractor in the Pacific Northwest. With over 1,000 talented professionals, 11 locations, and our own prefabrication shop, no project is too big or too small. We’ve helped shape the local landscape for over half a century with buildings that operate in the most efficient manner possible. We like to think we’re saving the planet one building at a time.

For us, it’s about culture. The impressions we leave on each other and our clients last for decades. Our clients have trusted us with their buildings for over 50 years. That’s because we listen to what our clients want, and we set out to make it happen.

Join our Team

MacMiller Leadership


Diverse players, one team, a common vision.

Collaboration is our foundation and critical to the success of the company. Every team member is valued and brings a diversity of strengths to help us meet our common vision.

“Personally, this value is essential to my role and daily tasks. Working collaboratively as a team in Service Coordination or interdepartmentally is crucial, as it allows us all to provide a prompt, well-informed, and exceptional experience for our customers.”

Karen Neuman, Service Coordination

Safety Director MacDonald-Miller


Our current EMR is 0.3800 – one of the lowest for mechanical contractors in the Washington State Fund. 

All MacMiller employees not only have the authority to stop unsafe work, but we also all have the responsibility to stop unsafe work. Nothing is more important than ensuring every employee goes home each and every day. I encourage everyone to use the standard of, ‘If a job or site is not safe enough for one of your loved ones, then we need to make it safe enough so that you would be comfortable with your loved one doing said work. – Lee Pyfrom, Safety Director

Safety Always


We are committed to building a truly inclusive culture where equitable pathways are paved, and a sense of belonging thrives for all, standing together as one MacDonald-Miller.  It is the responsibility of each of us individually to lead the way to real and lasting change.

Inclusion at MacDonald-Miller


As a design-build mechanical contractor, we employ a team of world-class engineers who design creative energy-saving solutions to meet or surpass our client’s sustainability goals. Whether a project is in design, under construction, or an existing building ripe for improvements, we have innovative solutions to help customers meet their goals.

Sustainability at MacDonald-Miller

PSBJ WA Best Places to Work 2022 Award


MacDonald-Miller ranked #5 Best Workplaces in Washington in 2022:

It is an honor to be on the Top 100 Best Workplaces list from Puget Sound Business Journal, for the third time, and awarded top 5 companies in the extra-large category this year. Thank you to all the MacMiller employees who make this company one of the best workplaces in the Pacific Northwest!

Join a Winning Team

We make buildings work better.