
Three i Design
Imagination. Innovation. Integrity.
Evansville, IN
Explore capabilities, project experience, and office locations to build your shortlist.

Imagination. Innovation. Integrity.
Evansville, IN

Engineering solutions that power mission success

Partner in Engineering the Right Building Environment
Troy, MI

Licensed MEP Engineering Done Right
Baton Rouge, LA

MEP Engineering and Mechanical Engineering.
Ambler, PA

Engineering for good solutions.
Glen Rock, PA

Boiler, combustion, thermal, and steam systems engineering.
Covington, LA

Because We Care About People, We Care About Buildings
Alexandria, VA

Bringing life to your project
Augusta, GA

Mechanical Engineering and HVAC Engineering.
Yuma, AZ
architecture, engineering, + problem solving
Madison, WI
Mechanical Engineering and Electrical Engineering.
Atlanta, GA
We Plan, Design and Consult to Create Healthy and Thriving Communities
Nashville, TN+1

Design. Manage. Deliver.
Orlando, FL+1

your trusted engineers
Coral Gables, FL
Innovative Engineering for a Sustainable World

Optical, Thermal, Mechanical Design and Product Development for LED
Rancho Cordova, CA

Mechanical Engineering and HVAC Consulting.

Mechanical and electrical engineering design for vertical construction in harsh climates
Anchorage, AK

Define Your Vision. Design in Collaboration. Deliver Beyond Your Expectations.
Oklahoma City, OK

Multi-Market MEP firm, client-focused, results-driven.
Austin, TX+1

Nationally recognized. Locally preferred.
Greenwood Village, CO+15

Expert Consulting Services in Engineering, Construction and Project Management
Cicero, IL

Making the complex simple since 1978.
Dallas, TX