1985: Mechanical Designs, Inc. founded

1990s–2000s: Expanded project capabilities and client partnerships

2010s: Integrated advanced BIM, energy modeling, and digital design practices

Today: Over 21,000+ completed projects and expanded multi-state engineering capabilities

Since it's founding, MDi has grown from a regional engineering firm into a trusted consulting partner supporting projects throughout the United States

Our success is built on three principles:

To provide exceptional consulting engineering services through technical expertise, personal attention, and dependable execution—delivering innovative solutions on time, on budget, and committed to our clients' long-term success.

To help create healthier, more efficient, and longer-lasting buildings through innovative engineering solutions that improve the built environment for generations to come. 

DEPENDABLE
Reliable advice. Consistent execution. Trusted partnerships.

INTENTIONAL
Thoughtful designs that maximize performance, efficiency, and long-term value.

COMMUNITY-MINDED
Engineering solutions that strengthen the places where we live and work.

"We are passionate about providing industry-leading service to our clients.  We are a close-knit, high-expertise firm built over 40 years and with more than 21,000 successful projects.  We work on diverse projects across the Valley, Arizona, and the U.S. and pride ourselves on bringing high value, cost-conscious solutions to our partners across the construction industry."   -   Tim Freese, President & CEO