Helping clients adapt to a changing world

With more than 2,400 employee-owners operating from locations across North America, we provide a full range of engineering and technical consulting services for government and private sector clients. From quick-turn projects to the most complex systems, our team is dedicated to providing quality solutions that deliver long-term value.

Progressing our clients’ missions by helping them achieve their goals

Making a large investment in a facility or system, whether new or existing, is a decision that impacts an enterprise for decades. Salas O’Brien offers the experience and expertise—and the networks and partnerships—to deliver projects that are reliable, resilient, versatile, and efficient, reducing operating costs and eliminating carbon.

Applying technical mastery and market vision

The objectivity to question assumptions, the versatility to embrace every problem’s unique nature, the experience to challenge the status quo. We approach each project with a holistic view, focused on achieving high quality, lasting relationships, and a sustainable future.

The right experience to deliver optimal solutions

Passionate Team Members
Annual Construction Value
Annual Projects
Offices Throughout North America
Service Areas

International scale, local action

Salas O’Brien uniquely integrates disciplines, collectively leveraging shared knowledge, information, and ideas. With this unified approach, we plan, design, manage, and deliver the highest quality project outcomes: one design, one team, one goal.

Our Projects

Growth and opportunity

Being Engineered for Impact™ means that Salas O’Brien team members have practically unlimited opportunity for growth and advancement. And a caring environment that supports this growth at every step.


Award-winning team

Our consistent recognition among top performing organizations in our industry and across North America is a reflection of our commitment to excellence and strong year-over-year performance.

Engineering News-Record


#39 on the Top 500 Design Firms list

MEP Giants


#11 among the top 100 MEP firms in North America

Inc. 5000


11x Honoree

BD+C Giants 400


#8 on the Top 35 Engineering/Architecture Firms list

Zweig Group Hot Firms


#3 among the 100 fastest-growing AEC firms in North America