From initial design to ongoing optimization, MacDonald-Miller provides a full suite of services to ensure your building works better, lasts longer, and operates more efficiently.

As the Pacific Northwest’s premier design-build mechanical contractor, we integrate deep expertise across every phase of your facility’s lifecycle. Our collaborative, in-house approach brings together professional engineers, project managers, and skilled field personnel to deliver innovative, practical solutions for everything from new construction and retrofits to 24/7 service and maintenance.

Whether you’re undertaking a complex hospital expansion, a fast-paced tenant improvement, or seeking to meet new energy compliance standards, our teams have the experience and technical knowledge to navigate any challenge. We’re committed to being your long-term partner, delivering trusted advice and proven solutions that contribute to your business goals. Discover how our integrated approach can make your building work better.