Alliant Systems is the leading design-build mechanical contractor in Oregon and Southwest Washington. What sets us apart is our all-in-one approach and our wide spectrum of services – new construction, tenant improvement, engineering, maintenance, controls, energy services and commissioning.

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We’re known for being a supremely capable, well-coordinated team of pros – all working side by side and saving customers time, money and headaches.

We have the privilege of working with large well-known brands and smaller private customers. We are proud of the reputation we have built in the industry, of the work we have done, the people we have helped and the incredible clients we continue to service to the highest standard. Our projects range from small retail spaces to 30-story office buildings, educational and manufacturing facilities, hospitals, parking structures and campus environments.